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 greater
than 25 pounds. To do so, she selected a random sample of 20 firemen and found s = 27.2 pounds.
Assuming that the weights of firemen are normally distributed, to test her research hypothesis the
statistician would use a chi-square test. In that case, what is the computed test value?
Place your answer, rounded to 3 decimal places, in the blank. For example, 23.456 would be a legitimate
entry.
22.49

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.
The CEO of a software company is committed to expanding the proportion of highly qualified women in
the organization’s staff of salespersons. He believes that the proportion of women in similar sales
positions across the country is less than 45%. Hoping to find support for his belief, he directs you to test
H
0
: p
.45 vs H
1
: p < .45.
In doing so, you collect a random sample of 50 salespersons employed by his company, which is thought
to be representative of sales staffs of competing organizations in the industry. The collected random
sample of size 50 showed that only 18 were women.
Compute the p-value associated with this test. Place your answer, rounded to 4 decimal places, in the
blank. For example, 0.3456 would be a legitimate entry.
0.1005

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.
The ABC battery company claims that their batteries last at least 100 hours, on average. Your experience
with their batteries has been somewhat different, so you decide to conduct a test to see if the company's
claim is true. You believe that the mean life is actually less than the 100 hours the company claims. You
decide to collect data on the average battery life (in hours) of a random sample of n = 20 batteries. Some
of the information related to the hypothesis test is presented below.
Test of H
0
:
100 versus H
1
:
100
Sample mean 98.5
Std error of mean 0.777