Question 14 of 20
1.0/ 1.0 Points
Accepted characters
: numbers, decimal point markers (period or comma), sign indicators (-),
spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).
NOTE:
For
scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
At a university, the average cost of books per student has been $550 per student per semester.
The Dean of Students believes that the costs are increasing and that the average is now greater
than $550. He surveys a sample of 40 students and finds that for the most recent semester their
average cost was $630 with a standard deviation of $120. What is the test value for this
hypothesis test?

Test value:
4.21
Round your answer to two decimal places as necessary.

Question 15 of 20
1.0/ 1.0 Points
Accepted characters
: numbers, decimal point markers (period or comma), sign indicators (-),
spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).
NOTE:
For
scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A statistician wishes to test the claim that the standard deviation of the weights of firemen is less
than 25 pounds. To do so, she selected a random sample of 20 firemen and found s = 23.2
pounds.
Assuming that the weights of firemen are normally distributed, if the statistician wanted to test
her research hypothesis at the .05 level of significance, what is the critical value?
Place your answer, rounded to 3 decimal places, in the blank. For example, 12.345 would be a
legitimate entry.
10.117

Question 16 of 20
1.0/ 1.0 Points
Accepted characters
: numbers, decimal point markers (period or comma), sign indicators (-),
spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).
NOTE:
For
scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A survey determines that mint chocolate chip is the favorite ice cream flavor of 6% of
consumers. An ice cream shop determines that of 190 customers, 15 customers stated their
preference for mint chocolate chip.
Find the P-value that would be used to determine if the percentage of customers who prefer mint