Question 7 of 20
0.0/ 1.0 Points
Results from previous studies showed 79% of all high school seniors from a certain city plan to
attend college after graduation. A random sample of 200 high school seniors from this city
reveals that 162 plan to attend college. Does this indicate that the percentage has increased from
that of previous studies? Test at the 5% level of significance.
State the null and alternative hypotheses.
A.H
0
: p = .79, H
1
: p ≠ .79
B.
0
:
= .79, H
1
:
> .79
C.H
0
:
= .79, H
1
:
> .79

D.H
0
: p
≤
.79, H
1
: p > .79
Answer Key: D
Question 8 of 20
0.0/ 1.0 Points
In an article appearing in
Today’s Health
a writer states that the average number of calories in a
serving of popcorn is 75. To determine if the average number of calories in a serving of popcorn
is different from 75, a nutritionist selected a random sample of 20 servings of popcorn and
computed the sample mean number of calories per serving to be 78 with a sample standard
deviation of 7.
At the
= .05 level of significance, does the nutritionist have enough evidence to reject the
writer’s claim?

Question 9 of 20
1.0/ 1.0 Points
Suppose that the mean time for a certain car to go from 0 to 60 miles per hour was 7.7 seconds.
Suppose that you want to test the claim that the average time to accelerate from 0 to 60 miles per
hour is longer than 7.7 seconds. What would you use for the alternative hypothesis?

Question 10 of 20
1.0/ 1.0 Points

A lab technician is tested for her consistency by taking multiple measurements of cholesterol
levels from the same blood sample. The target accuracy is a variance in measurements of 1.2 or
less. If the lab technician takes 16 measurements and the variance of the measurements in the
sample is 2.2, does this provide enough evidence to reject the claim that the lab technician’s
accuracy is within the target accuracy?

Question 11 of 20
1.0/ 1.0 Points
Results from previous studies showed 79% of all high school seniors from a certain city plan to
attend college after graduation. A random sample of 200 high school seniors from this city
reveals that 162 plan to attend college. Does this indicate that the percentage has increased from
that of previous studies? Test at the 5% level of significance.
What is the p-value associated with your test of hypothesis?
A.0.2437
B.0.4874
C.0.7563
D.0.6874
Answer Key: A

Part 2 of 3 -
4.0/ 6.0 Points