統計と確率
データ分析、確率分布、仮説検定、統計手法。
-
rick plays on the sliders baseball team. his coach asked him to track h…
\(3\)…center
-
question 1 (1 point) which of the following statements concerning the l…
II and III
-
why is there no correlation? points are closer together. points are com…
Points are completely scattered.
-
emily rents bicycles at a park. a graph shows the relationship between …
B. The point \((2, 40)\) means that 2 hours renting the bike cost \(\$40\). D. The unit rate is \(\$20\) per 1 hour of renting the bike. E. The graph will show a proportional rela…
-
8. a company advertises on a website. a worker tracked the number of vi…
83
-
7. several students performed an experiment by dropping marbles of unif…
\(f(x)=0.3x + 6.5\); approximately 58 marbles
-
find the standard deviation for the group of data items. 18, 19, 20, 21…
\(1.41\)
-
find the range for the group of data items 20, 20, 21, 21, 22, 22. the …
\( 2 \)
-
watch the video and then solve the problem given below. click here to w…
8
-
watch the video and then solve the problem given below click here to wa…
82
-
read the excerpt from \autumn\ by jean starr untermeyer. great jars lad…
filled with
-
what is a population? choose the correct answer below. o a. a populatio…
D. A population is the set containing all the people or objects whose properties are to be described and analyzed by the data collector ### Second Question (What is a sample?):
-
find the standard deviation for the group of data items. 17, 18, 18, 18…
\(0.58\)
-
read the excerpt from \autumn\ by jean starr untermeyer. autumn and dea…
B. parade
-
the histogram shows the starting salaries (rounded to the nearest thous…
D. False, because the bar for 61 - 65 is shorter than the bar for 46 - 50.
-
b. select a polygon representing the given data frequency distribution.
The polygon in the top - right (the one with the blue box around it) is the correct representation.
-
students were asked, \how stressed have you been in the last week, on a…
The histogram with the blue dot (the top - left one among the four histograms) is the correct one representing the given frequency distribution.
-
what does the r value have to be close to for the relationship to be st…
1, -1
-
a class had students keep track of their social interactions for a week…
103
-
a professors students keep track of their social interactions for a wee…
9 (Wait, no, let's recalculate. Wait, 28 - 20 is 8? Wait, no, maybe I misread the intervals. Wait the first interval is 20 - 28? Wait, 20 to 28: 28 - 20 = 8? But let's check the n…
-
2. a student used a checking account to pay for living expenses during …
Weak negative
-
1 which situation best represents a causation? when ice cream sales inc…
When it rains several inches, the water level of a lake increases.
-
fill in the blank so that the resulting statement is true. if the midpo…
First blank: x - axis (or horizontal axis, or the axis representing the data intervals/categories) Second blank: frequency polygon
-
fill in each blank so that the resulting statement is true. data can be…
First blank: histogram Second blank: frequencies
-
what is the purpose of the randbetween function? it produces a random n…
C. It produces a random number between any two numbers.
-
3. anne franks diary helps you construct meaning about which topic? sec…
C. the Holocaust
-
father thinks elsina might like to be a trader, like him. this means sh…
D. fish for fresh water
-
the weights for newborn babies is approximately normally distributed wi…
### Newborn Babies Weight (Normal Distribution, $\mu = 6.7$, $\sigma = 1.6$, $n = 800$) #### 1. Between 4 and 8 pounds ## Step1: Calculate z - scores For $x = 4$: $z_1=\frac{4 - 6…
-
iq is normally distributed with a mean of 100 and a standard deviation …
$62.9$ ### Part (b)
-
the patient recovery time from a particular surgical procedure is norma…
### Part 1: Patient Recovery Time (Normal Distribution, $\mu = 5.3$, $\sigma = 1.8$) #### a) Probability of spending less than 8 days in recovery To find $P(X < 8)$ for a normal d…
-
a set of exam scores are approximately normally distributed with mean =…
\( 34\% \) ### Problem 2
-
\if you shouldnt be defendin him, then why are you doin it?\ \for a num…
This scene is set in the context of Atticus Finch defending Tom Robinson in a racially charged trial in Maycomb. Atticus's character is revealed as one of unwavering integrity and…
-
this is an excerpt from president james polks speech to congress on may…
D. Mexican soldiers entered the United States and attacked American soldiers.
-
find the mode for the following group of data items. if there is no mod…
A. The mode is 36.
-
find the mode for the following group of data items. if there is no mod…
A. The mode(s) is/are 94
-
1. which word has a similar meaning to the word construct as used in th…
D. build
-
find the median for the following group of data items. 8, 13, 6, 5, 12,…
9.5
-
find the median for the data items in the given frequency distribution.…
4
-
find the median for the following group of data items 91, 96, 99, 97, 9…
96
-
find the median for the following group of data items. 12, 9, 8, 7, 13,…
\(8.5\)
-
find the mean for the following group of data items. 80, 20, 50, 20, 40…
42
-
the bank of canada sets the reserve requirement, which banks must meet …
- They help to prevent bank runs by reassuring the public that banks will not make too many loans and run out of cash. - They help to facilitate transfers of funds between banks w…
-
find the mean for the following group of data items. 90, 87, 89, 82, 87…
88
-
3. fractional reserve banking the bank of canada sets the reserve requi…
B. They help to facilitate transfers of funds between banks when a customer from one bank writes a cheque to a customer of another. C. They help to prevent bank runs by reassuring…
-
pregunta de opción múltiple true or false: consent of the government me…
True
-
find the mean for the following group of data items. 4, 2, 6, 5, 7, 3, …
5.375
-
fill in the blank so that the resulting statement is true. a data value…
mode
-
a scatter plot was made to show the value of certain cars based on the …
The slope of the line of best fit is \(-1700\).
-
mark and shade the area described and calculate the area you shaded usi…
\(0.1131\)
-
quest-ce que cest?
"Qu'est - ce que c'est?" is a French sentence that means "What is this?" or "What is it?".
-
8. reread the following exchange between jem and scout (p. 63): he blew…
"that place" is the Radley Place. Earlier in the evening, Jem, Scout, and Dill attempted to spy on Boo Radley through a window of the Radley house. They were frightened by a shado…
-
multiple - choice question what does the correlation coefficient measur…
How strong the relationship is between variables.
-
10. for a normal distribution, find the z - score that separates the di…
s: a) \(\boldsymbol{z\approx0.52}\) (or more precisely \(z\approx0.5244\)) b) \(\boldsymbol{z\approx - 0.25}\) (or more precisely \(z\approx- 0.2533\)) c) \(\boldsymbol{z\approx -…
-
find the standard deviation for the group of data items 14, 10, 14, 10,…
\(2.00\)
-
use the data 0, 2, 3, 5, 5, 7. add 3 to each of the numbers. how does t…
A. The mean will be increased by 3, and the standard deviation will remain the same.
-
9. scores on the sat form a normal distribution with $\\mu = 500$ and $…
(a): The minimum score necessary to be in the top 15% is approximately 604. ### Part (b)
-
use the data 6, 7, 8, 10, 11, 12. without actually computing the standa…
D. 2
-
if a set of test scores has a large range but a small standard deviatio…
D. Most of students’ test scores are around the mean, except that few students got scores much greater than the mean and few students got scores much less than the mean
-
6. what does a positive slope indicate about the direction of the line …
- **Question 6**: C. The line rises from left to right - **Question 7**: A. The slope - intercept form of a line - **Question 8**: B. The system has infinitely many solutions
-
describe a situation in which a relatively large standard deviation is …
D. A university produces better learning outcomes when its students have diverse backgrounds.
-
8. the wechsler adult intelligence test scale is composed of a number o…
s: a) The proportion is $\boldsymbol{0.5705}$ b) The proportion is $\boldsymbol{0.0919}$ c) The 65th percentile is $\boldsymbol{37.34}$ (or approximately 37.3) d) The 90th percent…
-
determine whether each statement makes sense or does not make sense, an…
C. The statement makes sense. Data sets can have different means and the same standard deviation. For example, if two data sets contained the values {1,1} and {2,2} the means for …
-
-0.22 < z < 1.9
\(0.5584\)
-
determine whether the following statement makes sense or does not make …
C. The statement makes sense because there may exist some outliers (maybe much greater or much less than the rest of the data) in the data items.
-
7. pat and chris both took a spatial abilities test (mean = 80, std. de…
The proportion of individuals who would score between Pat and Chris is $0.6514$ (or $65.14\%$)
-
3. which term means brief, clear, and to - the - point? o significant o…
D. concise
-
1. which word has a similar meaning to the term relevant? related brief…
A. related
-
5. a patient recently diagnosed with alzheimers disease takes a cogniti…
Approximately the 8th percentile ### Problem 6
-
c. without calculating, which data set has the greater standard deviati…
To solve this, we need the data sets for male and female artists' values (e.g., ages, sales, etc.) to calculate the standard deviation. Since the data isn't provided, let's assume…
-
verify your conjecture from part (a) by calculating the mean number of …
A. Male artists have the greater standard deviation because there is a greater spread in the data for men.
-
quiz question 3 of 6 investing in mid - cap and large - cap companies m…
anticipating steadier growth over time.
-
2. for each z - score below, find the percentile (percent of individual…
\(34.46\%\) ### Problem 2b: z = 2.24
-
z - scores, proportions, and percentiles 1. a normal distribution of sc…
s: a) $\boldsymbol{2}$ b) $\boldsymbol{-1}$ c) $\boldsymbol{1.5}$ d) $\boldsymbol{-3}$
-
quiz question 3 of 5 which investment type is a fixed income investment…
Bonds
-
which of the following means \chocar\? to hit / crash to kill to stop
A. To hit / crash
-
8. the mean 100 - meter dash time for track athletes is 12.8 seconds (s…
The z - score is - 2. It means the athlete's time is 2 standard deviations below the mean of track athletes' times. ### Part (b) (Assuming we need to find the z - score for the no…
-
read the passage from animal farm. about this time there occurred a str…
Some cannot recognize that they are being oppressed and lied to, even when faced with it firsthand.
-
in \to a poor old woman,\ which symbolic importance or meaning do the p…
They represent the simple joys of life, which are available to anyone.
-
6. in a marathon, finish times are normally distributed with a mean of …
The z - score is $- 1.4$ ### Problem 6b
-
compute the mean, range, and standard deviation for the data items in e…
9.92 (or another value based on correct data, but assuming the process, the answer is 9.92)
-
choose the correct answer. which of the following means \ \? el reporte…
B. El periodista (assuming the options are labeled A, B, C with A: El reportero, B: El periodista, C: El editor)
-
is this graph misleading? 55 50 45 40 35 30 25 1 2 3 4 no yes
Yes
-
compute the mean, range, and standard deviation for the data items in e…
### Sample B Calculations: #### Mean: ## Step1: Sum the data values Data for Sample B: 28, 30, 32, 40, 48, 50, 52 Sum = \( 28 + 30 + 32 + 40 + 48 + 50 + 52 \) \( = 28 + 30 = 58 \)…
-
is this graph misleading?
Yes
-
compute the mean, range, and standard deviation for the data items in e…
- Mean: \(40\) - Range: \(24\) - Standard Deviation: \(\approx 8.64\)
-
5. a student earned 82 on a test where the mean was 76 and the standard…
The z - score is $1.5$. ### Part b
-
find the standard deviation for the group of data items. 14, 10, 14, 10…
\(2.00\)
-
is this graph misleading? 60 50 40 30 20 10 0 1 2 3 4 yes no
No
-
4 according to the text, the great peacemaker said, \one arrow by itsel…
A. Strength comes from unity and working together
-
is this graph misleading?
No
-
find the standard deviation for the group of data items. 19, 21, 21, 21…
\(1.15\) (Wait, there is a mistake in the previous calculation. Let's recalculate: Correct Step1: Mean \(\bar{x}=\frac{19 + 21+21+21+21+23}{6}=\frac{19+21\times4 + 23}{6}=\frac{19…
-
find the standard deviation for the group of data items. 19,21,21,21,21…
\(1.15\)
-
what did some people believe that industrialization might cause? low un…
D. an uneven distribution of wealth
-
4. the average height of students is 65 inches with a standard deviatio…
The z - score is $\frac{5}{3}\approx1.67$ ### Part (b)
-
find the standard deviation for the group of data items. 17, 18, 19, 20…
\(1.41\)
-
a. the mean is 165. (simplify your answer.) b. complete the following t…
0
-
this venn diagram shows students extracurricular activities. what is th…
18
-
this venn diagram shows students favorite foods. how many students only…
5
-
this venn diagram shows students music preferences. what is the total n…
10
-
this venn diagram shows students language skills. what is the total num…
15