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 12.6. What is the 95% confidence interval for the average weight of a field mouse? (z = 1.96)
A) 222 to 228 grams
B) 217 to 223 grams
C) 221 to 229 grams
D) 240 to 245 grams
E) None of the above are correct.

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 12.6. What is the 95% confidence interval for the average weight of a field mouse? (z = 1.96)
A) 222 to 228 grams
B) 217 to 223 grams
C) 221 to 229 grams
D) 240 to 245 grams
E) None of the above are correct.

Quizplus · Accepted Answer

The 95% confidence interval is calculated using the formula: mean ± (z * (standard deviation / sqrt(sample size))). Here, it is 225 ± (1.96 * (15.1 / sqrt(120))), which results in approximately 222 to 228 grams.

120 Field Mice Are Weighed