The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took these 100 customers to check out was 3.0 minutes. It is known that the standard deviation of the checkout time is one minute. What is the 95% confidence interval for the true average checkout time? Please show formula and step by step. A. 2.5 to 3.5 B. 1.36 to 4.64 C. 1 to 5 D. 2.804 to 3.196
Added by Brenda A.
Step 1
96, and the standard deviation is 1 and the sample size is 100, we can calculate the margin of error as follows: Margin of error = 1.96 * (1 / sqrt(100)) = 1.96 * 0.1 = 0.196 Show more…
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