Question

An experiment using 35 guinea pigs is set up to study the weight of the pigs after injecting them with a drug. If the population mean is 23.5 grams with a standard deviation of 3.4 grams, what is the margin of error of the sample mean?

A. 0.097 grams
B. 0.575 grams
C. 0.701 grams
D. 1.149 grams
E. 1.403 grams

Answer 1

Explanation:

First we find the standard error.

This is Pop. std dev / square root of sample size

= 3.4 / √35

= 0.5747

For 95% confidence level

The margin of error = 0.5747 * 1.96

= 1.126 g.