120 field mice are weighed. The average weight of a mouse is 225 grams and the sample standard deviation is 15.1 grams.

-Refer to Exhibit 12.5. The estimated value of the test statistic is:
A)4.0
B)5.2
C)6.7
D)7.2
E)9.0

Question

120 field mice are weighed. The average weight of a mouse is 225 grams and the sample standard deviation is 15.1 grams.

-Refer to Exhibit 12.5. The estimated value of the test statistic is:
A)4.0
B)5.2
C)6.7
D)7.2
E)9.0

Quizplus · Accepted Answer

To calculate the estimated value of the test statistic, we need to use the formula: 
test statistic = (sample mean - hypothesized population mean) / (sample standard deviation / square root of sample size)

In this case, the hypothesized population mean is not given, so we assume it to be equal to 220g (the weight of an average field mouse reported in the literature).

test statistic = (225 - 220) / (15.1 / sqrt(120)) 
test statistic = 5 / (15.1 / 10.95) 
test statistic = 6.7

Therefore, the estimated value of the test statistic is 6.7, which corresponds to choice C).

120 Field Mice Are Weighed