Quiz 4 MATH302
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Part 1 of 3 -
11.0/ 11.0 Points
Question 1 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 your conclusion?
A.Cannot determine
B.More seniors are going to college
C.Reject H
0
. There is enough evidence to support the claim that the proportion of students
planning to go to college is now greater than .79.
D.Do not reject H
0
. There is not enough evidence to support the claim that the proportion of
students planning to go to college is greater than .79.
Answer Key: D

Question 2 of 20
1.0/ 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.

Compute the z or t value of the sample test statistic.

Question 3 of 20
1.0/ 1.0 Points
Which of the following statements are true of the null and alternative hypotheses?

Question 4 of 20
1.0/ 1.0 Points
You conduct a hypothesis test and you observe values for the sample mean and sample standard
deviation when n = 25 that do not lead to the rejection of H
0
. You calculate a p-value of 0.0667. What will
happen to the p-value if you observe the same sample mean and standard deviation for a sample size
larger than 25?

Question 5 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?
At the
= .01 level of significance, what is your conclusion?
A.Reject H
0
. At the
= .01 level of significance, there is enough evidence to support the claim
that this technician’s variance is larger than the target accu
racy.
B.Cannot determine
C.
Reject H
0
. At the
= .01 level of significance, there is not enough evidence to support the claim
that this technician’s true variance is
larger than the target accuracy.
D.
Do not reject H
0
. At the
= .01 level of significance there is not sufficient