统计与概率
数据分析、概率分布、假设检验与统计方法。
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the director of a community sports camp records the daily attendance. t…
16 days
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the director of a community sports camp records the daily attendance. t…
8
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indie asks students at her school, \how many books did you read over th…
- Peak: 0 to 2 books - Distribution description: The distribution is skewed right.
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where does this distribution have a peak? 0 to 2 books 3 to 5 books 9 t…
0 to 2 books
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indie asks students at her school, \how many books did you read over th…
14
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indie asks students at her school, \how many books did you read over th…
24
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indie asks students at her school, \how many books did you read over th…
\(8\)
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indie asks students at her school, \how many books did you read over th…
\(27\)
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how many students read 3 to 5 books? students an error has occurred. pl…
8
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elias is training his rabbit, poppy, for a kaninhoppning tournament. he…
The second histogram.
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which of the following is an example of definition speech? a. the diffe…
C. What It Means to Be a Good Leader
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the dot plot shows the number of days each student in mr. robinsons cla…
skewed right
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your leader asks you to help unload and organize merchandise from a lar…
Ask your leader if you can help the team members after you finish your task.
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describe the shape of the data distribution. the dot plot is?
symmetric
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match each term to the dot plot with that shape. hint: skewed left mean…
- First dot - plot: Skewed left - Second dot - plot: Symmetric - Third dot - plot: Skewed right
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dot plot shows the ages of seniors who nd the event etirement basics.\ …
It is mostly older seniors, with a few younger seniors.
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a speech explains the meaning or significance of a person, place, objec…
C. definition
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the dot plot shows the ages of seniors who attend the event etirement b…
It is mostly younger seniors, with a few older seniors.
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he dot plot shows the ages of children who attend the event \story time…
It is mostly 3 to 5 year olds, with a few older children.
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match each description to the correct dot plot. gap between 3 and 6 out…
First dot - plot: Cluster from 3 to 6; Second dot - plot: Outlier at 3; Third dot - plot: Gap between 3 and 6.
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describe the data distribution. the dot plot has a peak at 8. the dot p…
12
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the dot plot shows the weights of boxes of cereal in a supermarket wind…
\(8\)
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melissa has a collection of bonsai. the dot plot shows the heights of t…
\(8\)
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how many bonsai are in melissas collection? 15 bonsai a komono bonsai i…
11
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at the school carnival, students played a game where they had to guess …
1. estimated 2. overestimated 3. underestimated
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read the paragraph. nora often found it hard to predict how long her ho…
She thought it would take an hour, but it actually took much more time.
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complete the paragraph to explain the meaning of the word instinctively…
natural
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find the (a) mean, (b) median, (c) mode, and (d) midrange for the data …
\(185.5\)
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a students course grade is based on one midterm that counts as 5% of hi…
His overall final score is \(82.1\). Since \(80\leq82.1<90\), his letter grade is \(B\).
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select the correct answer. the word part mono - means \one\ or \single.…
B. sameness
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a students course grade is based on one midterm that counts as 25% of h…
\(79.1\)
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read this excerpt from paragraph 1. with the exception of the night - w…
D. wakened
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the data set shows the lengths of snakes in meters. snake length (m) 1 …
The dot - plot is made as per the above steps with the correct number of dots at each data value position (e.g., two dots at \(1\), three dots at \(2\), one dot at \(2.5\), two do…
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find the (a) mean, (b) median, (c) mode, and (d) midrange for the data …
$43.1$
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below are the jersey numbers of 11 players randomly selected from a foo…
D. Jersey numbers are nominal data that are just replacements for names, so the resulting statistics are meaningless.
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below are the jersey numbers of 11 players randomly selected from a foo…
\(697.0\)
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below are the jersey numbers of 11 players randomly selected from a foo…
Sample standard deviation = \(26.6\)
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below are the jersey numbers of 11 players randomly selected from a foo…
$83$
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tower height (ft) 1.5 2 2 2.5 2.5 2.5 2.5 3 4 4 look at the distributio…
The most common tower height is \(2.5\) ft.
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the 161 heights of males from a data set of body measurements vary from…
The estimated standard deviation using the range rule of thumb is \(9.35\) cm. Since the estimated value \(s = 9.35\) cm and the calculated value \(s=6.02\) cm, and \(|9.35 - 6.02…
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based on the scatter plot below, which is a better prediction for x whe…
\(5\)
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based on scatter plot below, which is a better prediction for y when x …
63
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students in mr. gauers class made towers from paper and tape. the data …
The dot - plot has \(1\) dot at \(1.5\), \(2\) dots at \(2\), \(4\) dots at \(2.5\), \(1\) dot at \(3\) and \(2\) dots at \(4\).
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based on the scatter plot below, which is a better prediction for x whe…
\(1\)
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the body temperatures of a group of healthy adults have a bell - shaped…
a. Approximately \(68\%\) of healthy adults in this group have body temperatures within 1 standard deviation of the mean, or between \(97.56^{\circ}F\) and \(98.86^{\circ}F\). b. …
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based on the scatter plot below, which is a better prediction for y whe…
45
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the body temperatures of a group of healthy adults have a bell - shaped…
68
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reread the part of the passage in the box. after some people laid flowe…
thought about what the new year would bring
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based on the scatter plot below, which is a better prediction for x whe…
\(66\)
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language should be _______________, meaning it does not reflect a bias …
d. appropriate
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the blood platelet counts of a group of women have a bell - shaped dist…
a. \(95\) b. \(99.7\)
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the blood platelet counts of a group of women have a bell - shaped dist…
95
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listed below are amounts (in millions of dollars) collected from parkin…
The coefficient of variation for the amount collected by the security service company is \(9.3\%\). The coefficient of variation for the amount collected by the other companies is…
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listed below are amounts (in millions of dollars) collected from parkin…
\(9.5\)
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a data set lists weights (lb) of plastic discarded by households. the h…
a. \(2.881\) b. \(1.64\) c. \(1.64\) d. Since \(z = 1.64\) and \(- 2<1.64<2\), the weight of \(5.13\) lb is not significant.
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a data set lists weights (lb) of plastic discarded by households. the h…
a. The difference is \(2.881\) lb. b. The difference is \(1.64\) standard deviations.
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a data set lists weights (lb) of plastic discarded by households. the h…
\(2.881\)
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khalil is planning a picnic lunch for the students at his school. each …
Students at the school will choose a peach more often than any other fruit.
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each bus in vivians city has a unique id number. she wants to know how …
Use a computer to list the ID numbers in a scrambled order. Then, choose the first 20 buses on the list.
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the frequency table shows the number of runs a baseball team scored in …
Follow the above - described steps to correctly plot the frequencies ( \(0:4\), \(1:6\), \(2:5\), \(3:3\), \(4:1\), \(5:2\), \(6:0\), \(7:0\), \(8:1\)) on the number line.
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students in a marching band play trumpets (t), flutes (f), and drums (d…
Sample D
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which statement uses simple, vivid language? a. the bright reds and ora…
A. The bright reds and oranges of the sunset caught my attention as I relaxed this evening.
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pia is the manager of xyz supermarket. she has a project to find out ho…
Survey XYZ Supermarket employees who work in the meat department.
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pia is the manager of xyz supermarket. she has a project to find out ho…
All employees of XYZ Supermarket
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the following are the ratings of men by women in an experiment involvin…
\(1.0,3.5,4.5,7.0,8.5\)
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the box plots show a random sample of wait times for two rides at a wat…
No. There is a lot of overlap in the two data sets.
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the box plots show a random sample of wait times for two rides at a wat…
2 minutes longer
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the box plots show a random sample of wait times for two rides at a wat…
The median wait time for Speed Slide is greater than the median wait time for Wave Machine. The IQR for both rides is \(6\) minutes.
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the box plots show a random sample of wait times for two food trucks at…
No. There is a lot of overlap in the two data sets.
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the box plots show a random sample of wait times for two food trucks at…
The median wait time for the pizza truck is \(4\) minutes shorter than the median wait time for the taco truck. The IQR for both is \(2\) minutes.
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the box plots show a random sample of wait times for two food trucks at…
The median wait time for the pizza truck is less than the median wait time for the taco truck. The IQR for both food trucks is \(2\) minutes.
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the box plots show the heights of sunflower plants in a random sample o…
Field A typically has plants with more consistent heights. You can tell because the inter - quartile range of its sample is less than that of the other field.
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the box plots show the heights of sunflower plants in a random sample o…
The random samples are likely to be representative of the population of sunflower plants at each field.
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mr. wills keeps markers in two boxes. each box has 80 markers of differ…
Mr. Wills can expect that Box A has about \(16\) more blue markers.
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mr. nakamura asks several students how many minutes it took them to com…
The first blank is \(10\) and the second blank is \(35\).
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match each data set with the description of its variability. 5, 5, 5, 5…
\(5,5,5,5,5,5\) — No variability; \(7,9,12,30,56,99\) — A lot of variability; \(7,8,10,10,11,11\) — Some variability.
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how much variability should mrs. perez expect in the data? no variabili…
Some variability
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mrs. perez collects data from 12 students to answer three different que…
The data set "How many minutes do students spend playing video games each day?" has the most variability.
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an object was launched off the top of a building. the function ( f(x)=-…
The domain of the function is $0\leq x\leq4$.
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a scientist estimates that the mean nitrogen dioxide level in a city is…
\(z\approx0.41\)
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a scientist estimates that the mean nitrogen dioxide level in a city is…
\(z\approx - 0.39\)
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a scientist estimates that the mean nitrogen dioxide level in a city is…
(a) The correct option is F: \(H_0:\mu\leq31\), \(H_a:\mu > 31\) (claim) (b) Critical value \(z_0 = 1.17\), Rejection region \(z>1.17\)
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a scientist estimates that the mean nitrogen dioxide level in a city is…
\(z_0=1.17\)
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test a claim that the mean amount of lead in the air in u.s. cities is …
There is not enough evidence at the \(1\%\) level of significance to support the claim that the mean amount of lead in the air in U.S. cities is less than \(0.037\) microgram per …
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test a claim that the mean amount of lead in the air in u.s. cities is …
Fail to reject \(H_0\) because the standardized test statistic is not in the rejection region.
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test a claim that the mean amount of lead in the air in u.s. cities is …
\(t\approx0.22\)
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what is a histogram? choose the correct answer below. ○ a. a histogram …
C. A histogram is a bar graph with bars that touch that can be used to visually display the data from a frequency distribution.
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test a claim that the mean amount of lead in the air in u.s. cities is …
\(-2.40\)
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test a claim that the mean amount of lead in the air in u.s. cities is …
\(H_0:\mu\geq0.037\), \(H_a:\mu < 0.037\). The claim is the alternative hypothesis.
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a research center claims that 27% of adults in a certain country would …
\(P = 0.003\)
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a research center claims that 27% of adults in a certain country would …
\(z\approx2.99\)
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a research center claims that 27% of adults in a certain country would …
A. 27% of adults in the country would travel into space on a commercial flight if they could afford it. \(H_0:p = 0.27\) and \(H_a:p eq0.27\)
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an education researcher claims that at most 8% of working college stude…
\(z\approx1.65\)
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an education researcher claims that at most 8% of working college stude…
\(z_{0}=1.28\)
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an education researcher claims that at most 8% of working college stude…
A. At most \(8\%\) of working college students are employed as teachers or teaching assistants. \(H_0:p\leq0.08\) \(H_a:p > 0.08\)
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a medical researcher says that less than 80% of adults in a certain cou…
B. The rejection region is \(z < - 2.33\)
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a medical researcher says that less than 80% of adults in a certain cou…
\(z_0=-2.33\)
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a medical researcher says that less than 80% of adults in a certain cou…
- Claim: C. Less than \(80\%\) of adults in the country think that healthy children should be required to be vaccinated. - Hypotheses: F. \(H_0: p\geq0.80\), \(H_a: p < 0.80\)
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a medical researcher says that less than 80% of adults in a certain cou…
C. Less than 80% of adults in the country think that healthy children should be required to be vaccinated.
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a research center claims that at least 29% of adults in a certain count…
\(z=-1.88\)