A. 0.2323 to 0.3075
B. 0.2325 to 0.3075
C. 0.2325 to 0.3185
D. 0.2323 to 0.3185
Question 26 of 40

0.0/ 2.5 Points
Which line of the three shown in the scatter
diagram below fits the data best?
A. A
B. B
C. C
D. All the lines are equally good

Question 27 of 40
0.0/ 2.5 Points
Which graph has two groups of data, correlations
within each group, but no correlation among all the data?
A.
B.
C.

D.
Question 28 of 40
0.0/ 2.5 Points
A researcher wishes to estimate the mean amount
of money spent per month on food by households in a certain
neighborhood. She desires a margin of error of $30. Past
studies suggest that a population standard deviation of $248
is reasonable. Estimate the minimum sample size needed to
estimate the population mean with the stated accuracy.
A. 274

B. 284
C. 264
D. 272
Question 29 of 40
0.0/ 2.5 Points
Select the best fit line on the scatter diagram
below.

A. A
B. B
C. C
D. All of the lines are equally good
Question 30 of 40
0.0/ 2.5 Points
Select the best fit line on the scatter diagram
below.

A. A
B. B
C. C
D. None of the lines is the line of best fit
Question 31 of 40
0.0/ 2.5 Points

A random sample of 30 households was selected
from a particular neighborhood. The number of cars for each
household is shown below. Estimate the mean number of cars
per household for the population of households in this
neighborhood. Give the 95% confidence interval.
A. 1.14 to 1.88
B. 1.12 to 1.88
C. 1.12 to 1.98
D. 1.14 to 1.98

Question 32 of 40
0.0/ 2.5 Points
The graph shows a measure of fitness (y) and
miles walked weekly. Identify the probable cause of the
correlation.
A. The correlation is coincidental.
B. There is a common underlying cause of the
correlation.
C. There is no correlation between the

variables.
D. Walking is a direct cause of the fitness.
Question 33 of 40
0.0/ 2.5 Points
Monthly incomes of employees at a particular
company have a mean of $5954. The distribution of sample
means for samples of size 70 is normal with a mean of $5954
and a standard deviation of $259. Suppose you take a sample
of size 70 employees from the company and find that their
mean monthly income is $5747. How many standard
deviations is the sample mean from the mean of the sampling
distribution?
A. 0.8 standard deviations above the mean

B. 0.8 standard deviations below the mean
C. 7.3 standard deviations below the mean
D. 207 standard deviations below the mean
Question 34 of 40
0.0/ 2.5 Points
Suggest the cause of the correlation among the
data.

The graph shows strength of coffee (y) and
number of scoops used to make 10 cups of coffee (x).
Identify the probable cause of the correlation.
A.
The variation in the x variable is a direct
cause of the variation in
the y variable.
B. There is no correlation between the
variables.
C. The correlation is due to a common
underlying cause.

D. The correlation between the variables is
coincidental.
Question 35 of 40
0.0/ 2.5 Points
A sample of 64 statistics students at a small
college had a mean mathematics ACT score of 28 with a
standard deviation of 4. Estimate the mean mathematics ACT
score for all statistics students at this college. Give the 95%
confidence interval.

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- Spring '19
- Tom Pope