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21
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At the Fisher farm, the weights of zucchini squash are Normally distributed, with a mean of 5 ounces and a standard deviation of 0 point 7 ounces. Which weight represents the 8 th percentile? Use the z -table.

A
4 point 0 1 ounces
B
5 point 5 9 ounces
C
3 point 5 6 ounces
D
5 point 9 8 ounces
22
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Data were collected from a typing class with 10 students. The class had an average of 56 words per minute (WPM) with a standard deviation of 7 WPM. The teacher realized that the data from one student who typed 70 WPM was not entered. If this student’s results were included in the data set, what effect would it have on the standard deviation?

A
The standard deviation would be about the same, perhaps a little smaller.
B
The standard deviation would be noticeably smaller.
C
The standard deviation would be noticeably larger.
D
The standard deviation would be about the same, perhaps a little larger.
23

A certain board game used a spinner divided into 12 equal regions showing the numbers 1 – 12 If the spinner is used four times, what is the probability that the result is a number 8 or larger at least once?

A
0 point 1 1 5 8
B
0 point 8 0 2 5
C
0 point 0 3 0 1
D
0 point 8 8 4 2
24

A student would like to estimate the average number of text messages sent by cell-phone users in a day. Which of the following methods would provide a voluntary response sample?

A
a survey of all students in a statistics class
B
a survey of every 10th person leaving a large shopping mall
C
a text poll provided during a nightly news broadcast
D
a survey of adults leaving a movie theater
25

The daily high temperatures in a vacation resort city are approximately Normal, with a mean temperature of 75 degrees Fahrenheit and a standard deviation of 6 degrees. If a weather forecast predicts the high temperature will be at most 68 degrees, the city provides fewer lifeguards for the city beaches. On what percentage of days will fewer lifeguards be provided? Use the z -table.

A
12 point 1 0 percent
B
4 point 3 6 percent
C
95 point 6 4 percent
D
87 point 9 0 percent
26

What percentage of people spend between 41 and 56 minutes watching TV shows on this streaming service?

A
47 point 5 percent
B
13 point 5 percent
C
34 percent
D
95 percent
27

A certain standardized test measures students’ knowledge in English and math. The English and math scores for 10 randomly selected students are given in the table. Using technology, what is the value of r squared ?

A
1 point 2 2
B
0 point 9 9
C
0 point 8 3
D
0 point 9 1
28

Which of the following statements is correct?

A
Twice as many teenagers in the sample chose soccer over basketball as their favorite sport.
B
More teenagers in the sample chose lacrosse over volleyball as their favorite sport.
C
Twice as many teenagers in the sample chose football over basketball as their favorite sport.
D
The bar for lacrosse is one-third the height of the bar for football.
29

Which method describes an observational study?

A
Method 2 is an observational study because students can choose to participate in the music lessons.
B
Method 1 is an observational study because past data are collected and analyzed.
C
Both methods are observational studies because both include students who do and do not play a musical instrument.
D
Method 2 is an observational study because two city schools are chosen to participate.
30

What is the equation of the least-squares regression line?

A
widehat Area is equal to 0 point 0 1 0 plus 3 point 1 4 1 times open paren Time squared close paren
B
widehat Area is equal to 3 point 1 4 1 plus 0 point 0 1 0 times open paren Time squared close paren
C
widehat Area squared is equal to 3 point 1 4 1 plus 0 point 0 1 0 times Time
D
the natural log of widehat Area is equal to 0 point 0 1 0 plus 3 point 1 4 1 times open paren Time squared close paren
31

Using the line of random numbers, how many "adulthood” responses are in the first trial of the simulation?

A
20
B
15
C
5
D
10
32

Based on the graph, is there an association between food ordered and drink ordered?

A
There is no association because the distribution of drinks ordered is the same among the food groups.
B
There is an association because the distribution of drinks ordered is the same among the food groups.
C
There is no association because the distribution of drinks ordered differs among the food groups.
D
There is an association because the distribution of drinks ordered differs among the food groups.
33

Based on the residual plot, is the linear model appropriate?

A
No, there is a clear pattern in the residual plot.
B
No, there is no clear pattern in the residual plot.
C
Yes, the residuals are relatively small.
D
Yes, there is no clear pattern in the residual plot.
35

The teacher realizes that a mistake was made and the student whose score was recorded as 49 percent should have been 69 percent If the mistake is corrected, what effect will this have on the mean and median scores?

A
The mean and median will both increase.
B
The mean will increase but the median will be unchanged.
C
Neither the mean nor the median will change.
D
The mean will increase but the median will decrease.
36

What percentage of the time will Oliver arrive between 15 and 20 minutes late to work?

A
5 percent
B
25 percent
C
16 point 7 percent
D
50 percent
37

Which interval contains the median bag weight?

A
32 point 2 – 32 point 3 ounces
B
31 point 9 – 32 point 0 ounces
C
32 point 0 – 32 point 1 ounces
D
32 point 1 – 32 point 2 ounces
38

Which of the following is a valid conclusion?

A
It cannot be inferred that the new additive caused the extended life of the cut flowers, and this inference cannot be applied to the carnations from the greenhouse.
B
It can be inferred that the new additive caused the extended life of the cut flowers, and this inference can be applied to all carnations.
C
It cannot be inferred that the new additive caused the extended life of the cut flowers, and this inference can only be applied to the carnations from the greenhouse.
D
It can be inferred that the new additive caused the extended life of the cut flowers, and this inference can only be applied to the carnations from the greenhouse.

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