Statistiques
Analyse de données, distributions de probabilités et tests d'hypothèses.
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12 multiple choice 1.43 points a professor was interested in determinin…
Formula: $\bar{x} \pm t_{\alpha/2} \cdot \frac{s}{\sqrt{n}}$; Calculator Function: T-Interval
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11. a class recorded the number of books each student read this month. …
a) $\approx 2.36$ b) 2 c) 2 d) 5
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a personal trainer was completing some research on the resting heart ra…
Formula: $LB=\sqrt{\frac{(n - 1)s^2}{\chi^2_{\frac{\alpha}{2}}}}$ and $UB=\sqrt{\frac{(n - 1)s^2}{\chi^2_{1-\frac{\alpha}{2}}}}$ (the last option)
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10. the following numbers represent the number of goals scored by a soc…
a) 3.1 b) 3 c) 2 and 3 d) 5
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8 multiple choice 1.43 points a professor at a local university wanted …
We are 95% confident that the standard deviation for the age at which a person obtains their Bachelor’s degree will lie between 1.37 and 3.44 years.
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9. a group of 18 students recorded how many hours they slept last night…
The median remains 7.
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8. a math class created a dot plot showing how many books each student …
The mean will not change
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5 multiple choice 1.43 points a professor at cypress college wanted to …
C. We are 90% confident that the mean commute time for a Cypress College student will lie between 17.1 and 33.3 minutes.
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7. a group of 21 students recorded how many hours they spent on homewor…
The mean number of hours will decrease.
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3 multiple choice 1.42 points one of the most common places where peopl…
1. We are 95% confident that the proportion of married people that met their spouse at work will lie between 0.27 and 0.35.
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6. a class of 18 students recorded how many pets they have at home. the…
The mean number of pets will increase.
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21. in august, the simons water bill was $48. in september, it was 15% …
$40.8$
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1) which of the variables is independent and which is dependent? 2) n i…
i) n is the independent variable, and r is the dependent variable. ii) dependent on
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3. you took 5 tests. four of them are in the 80s and 90s, but one test …
Decrease
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susan has scored 98, 76, and 94 on her previous three tests. what score…
\(64\)
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what is a channel of distribution that represents a company in a foreig…
a. agent
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interpret the meaning of the algebraic expression in each problem. 2 an…
- Variable: $s$ represents the cost of one sandwich. - Coefficient: $2$ (in $2s$) is the number of sandwiches bought. - Constant term: $2.79$ represents the cost of the large drin…
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use the equation of the trend line to predict the amount of calories bu…
668
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use the equation of the trend line to predict the number of coffee drin…
120
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in dystopian novels like the handmaid’s tale, the society is often char…
A. Strict surveillance and state - controlled reproduction
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3 the table shows the number of laps that three students ran around the…
11
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an appeal is a serious request. in the court system, the word appeal ha…
The loser of the case finds out that the judge took a bribe from the lawyer on the winning side.
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read the problem. at skyrocket amusement park, 30% of the rides are rol…
The blue model (with "?") is correct. 60 rides
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directions: for the situations below, define a random variable x for th…
1) Does not follow a binomial distribution. 2) Follows a binomial distribution \(X\sim B(100,0.6)\). 3) Does not follow a binomial distribution. 4) Follows a binomial distribution…
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spam: a researcher reported that 71.8% of all email sent in a recent mo…
At the \( \alpha = 0.10 \) level of significance, there is enough evidence to conclude that the percentage of emails that are spam differs from 71%. At the \( \alpha = 0.01 \) lev…
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27 true or false 1 point statistics are easier to understand and rememb…
True
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your coffee store starts each morning with 3600 ounces of their most po…
The \(x -\)intercept is the number of cups you sold when you ran out popular coffee.
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your coffee store starts each morning with 3600 ounces of their most po…
The y - intercept is the amount of coffee you started with in the morning.
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a balloon starts at a height of 100 meters and descends at a rate of 5 …
The y - intercept is the initial height of the balloon before it starts descending.
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a company starts with 500 units of a product in stock and sells 30 unit…
The \(y\) - intercept is the initial stock of the product before any sales.
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question 2 2 pts a tech store sells laptops (x) for $800 and tablets (y…
The x - intercept is the number of laptops sold when zero tablets were sold.
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a garden center sells trees (x) for $30 each and shrubs (y) for $15 eac…
The x - intercept is the number of trees sold when zero shrubs were sold.
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p - value = 0.0139 part: 3 / 5 part 4 of 5 determine whether to reject …
For \( \alpha = 0.10 \): reject For \( \alpha = 0.01 \): do not reject
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compute the p-value. round the answer to four decimal places. p-value =…
For \( \alpha = 0.10 \): reject For \( \alpha = 0.01 \): do not reject
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what is the approximate correlation coefficient of the linear best - fi…
0.9707
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immigration over time immigration has increased dramatically over the y…
A. increased dramatically
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spam: a researcher reported that 71.8% of all email sent in a recent mo…
For \( \alpha = 0.10 \): reject the null hypothesis \( H_0 \) For \( \alpha = 0.01 \): fail to reject the null hypothesis \( H_0 \)
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spam: a researcher reported that 71.8% of all email sent in a recent mo…
\(H_0: p = 0.71\), \(H_1: p eq0.71\), and the test is two - tailed.
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in a simple random sample of 100 allergy sufferers, 15 of them reported…
Yes, it is appropriate.
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is there a doctor in the house? a market research firm reported the mea…
Do not reject the null hypothesis \( H_0 \).
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modern immigration: from 1900 to 2010, over 7% of new immigrants came f…
B. Ellis Island was closed, and people need a green card or work visa to immigrate at a port of entry. (Assuming the second option is labeled B; if the original options had differ…
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5 select the correct answer. read lines 25–31 from the scene. (25) than…
C. witchcraft
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question 12, 7.3.19 - t part 2 of 6 hw score: 36.59%, 8.04 of 22 points…
(a) \(H_0:\mu = 19000\), \(H_a:\mu eq19000\) (the first option in the given multiple - choice for part (a)). (b) The critical values are \(t = 2.080\) and \(t=-2.080\). The rejec…
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3 select the correct answer. read lines 68–74 from the scene. lady macb…
A. Macbeth should act as if everything is normal
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select the correct answer from the drop-down menu. read lines 25–28 fro…
beliefs
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17. expressing \\(\\sqrt{2}\\) as the ratio \\(\\frac{\\sqrt{2}}{1}\\) …
s: 17. False 18. False
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a new coal-burning power plant can generate 1.4 gigawatts (billion watt…
\(1010020\)
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a bakery offers cupcakes with 3 flavors of cake and 3 types of frosting…
9
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a store sells bicycles with 2 frame types, 3 wheel sizes, and 5 colors.…
30
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a school offers 4 history classes, 3 art classes, and 3 gym classes. if…
36
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a phone case comes in 4 colors and can have 2 types of designs. how man…
8
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a lunch menu offers 3 kinds of sandwiches, 2 side dish options, and 4 d…
24
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19) based on the scatter plot, predict the value of x when y = 9. a) 7 …
19. D. 6 20. A. 65 21. C. 25
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an area of 100 square miles was divided into 100 quadrants of 1 square …
500
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greek & latin roots match the word part to its meaning. insula (peninsu…
- insula (peninsula) → island - mne (amnesia) → remember - gno (ignorant) → know ### Part 2: Synonyms or Antonyms?
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you just found that the slope is 2. what does a slope of 2 mean in this…
The volume increases 2 milliliters per 1 cube added.
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is there a doctor in the house? a market research firm reported the mea…
\(t\approx2.402\)
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13 based on the scatter plot, predict the value of x when y = 20. a) 12…
13. A. 12 14. A. 23 15. A. 5
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question 4 0.2 pts which of the following is not a power of the us cong…
The power to declare that federal or state laws are unconstitutional
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the average price each year for an airline ticket from 2010 to 2018 is …
A. Airline ticket prices are likely to decrease as time goes on.
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suppose a sample consists of the following data values. what is the sam…
B. 7
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3b) suppose a sample consists of the following data values. what is the…
C. 6
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is there a doctor in the house? a market research firm reported the mea…
\(H_0:\mu = 178258\) \(H_1:\mu eq178258\) This hypothesis test is a two - tailed test.
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the heights of the trees in a forest are normally distributed, with a m…
2.3%
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are you smarter than a second - grader? a random sample of 61 second - …
### Part (a) \(H_0:\mu = 54\), \(H_1:\mu eq54\), two - tailed test. ### Part (b) \(z=-2.34\) ### Part (c) \(P - value = 0.0193\) ### Part (d) Do not reject \(H_0\) (Note: The giv…
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what is the probability that out of 175 chicks hatched on peeper farm, …
B. 88.7%
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which of the following probabilities is the greatest for a standard nor…
\(P(-0.5 \leq Z \leq 0.5)\) (the second option)
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test the claim about the population mean μ at the level of significance…
\(P = 0.552\)
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the practice of selective incorporation means that the bill of rights w…
sometimes be applied to the states by the Court.
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greater than or equal to means a ______. solid line no line dotted line
A. solid line
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omar recorded the number of hours he worked each week for a year. below…
5.2
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(b) compute the value of the test statistic. round the answer to at lea…
Reject the null hypothesis \(H_0\) (i.e., the option "Reject" should be selected).
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what is the probability of flipping a coin 85 times and getting tails 5…
A. 99.8%
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if a binomial trial has a probability of success of 0.3, how many succe…
D. 600
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the wildcats and the leopards are evenly matched football teams. when t…
B. 24.6%
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williams math teacher plots student grades on their weekly quizzes agai…
6 hours
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a plot is shown relating the number of vehicles using alternative fuels…
d. The number of vehicles using alternative fuels in the United States increased from approximately 275,763 in 1992 by approximately 18,891 every year up to 1999.
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which situation can be considered a binomial experiment? # choice a. dr…
C. Tossing a coin 10 times and recording the number of times it lands on heads
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are you smarter than a second - grader? a random sample of 61 second - …
two - tailed
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corey has a part-time job at an ice skating rink selling hot cocoa. he …
47
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bryson collects data on the depth of a river at various points and the …
The scatterplot in the bottom-left corner (labeled c)
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are you smarter than a second - grader? a random sample of 61 second - …
\( H_0: \boldsymbol{\mu = 54} \) \( H_1: \boldsymbol{\mu eq 54} \) This hypothesis test is a \(\boldsymbol{z}\) test.
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nqee cluster 11: interpret linear models standard: compute (using techn…
d. An increase in visitors is correlated with an increase in sales.
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what is $_{9}c_{7}$? # choice a. 66 b. 45 c. 55 d. 36
D. 36
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choose the transition that introduces a new example or idea. after drop…
For instance
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type i error: a company that manufactures steel wires guarantees that t…
greater than ### Part 2: Type II Error Conclusion
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4a ) which of these is an example of a discrete random variable? # choi…
A. Number of pets
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according to the table below, what is the probability that the grade of…
C. $\frac{1}{7}$ (Wait, no, let's recalculate. Wait, the probability of A is $\frac{2}{35}$ and B is $\frac{3}{35}$. So B or higher is A + B. So $\frac{2}{35}+\frac{3}{35}=\frac{5…
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12 fred recorded the number of minutes he read each day, from monday th…
12. (1) 0.984 and strong 13. (4) \(k(x) = (x + 3)^2\)
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type i error: a company that manufactures steel wires guarantees that t…
### Part 1: Type I Error # Explanation: ## Step1: Recall Type I Error Definition A Type I error occurs when we reject the null hypothesis ($H_0$) when it is actually true. Here, $…
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in a valid probability distribution, each probability must be between 0…
A. $\frac{1}{6}$
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type i error: a company that manufactures steel wires guarantees that t…
greater than
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which type of error? water pipe to be used in a certain application is …
# Explanation for Part (a): ## Step1: Recall Type I and Type II errors Type I error: Reject \( H_0 \) when \( H_0 \) is true. Type II error: Fail to reject \( H_0 \) when \( H_0 \…
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which type of error? water pipe to be used in a certain application is …
Type II
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how many computers? in a simple random sample of 170 households, the sa…
$1.51 < \mu < 1.75$ ### Part 2 of 4 (b)
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how many computers? in a simple random sample of 170 households, the sa…
### Part (a) # Explanation: ## Step 1: Recall the formula for confidence interval The formula for a confidence interval for the population mean when the population standard deviat…
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how many computers? in a simple random sample of 170 households, the sa…
(a) The 90% confidence interval is \(1.51 < \mu < 1.75\). (b) The margin of error would be smaller, since an increase in the sample size will decrease the standard error.
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a delivery truck has to reach a distribution center located 180 miles a…
4
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macbeth by william shakespeare shakespeare’s play macbeth is one of his…
A. Lady Macbeth has no doubts or misgivings about killing Duncan to get power.
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macbeth by william shakespeare act i, scene 7 shakespeare’s play macbet…
B. Everyone will learn of the murder