Question

Use the given degree of confidence and sample data to construct a confidence interval for the population mean μ .

Assume that the population has a normal distribution. The principal randomly selected six students to take an aptitude test. Their scores were: 72.3 87.0 82.6 86.1 84.5 74.8 Determine a 90 percent confidence interval for the mean score for all students.

a. 86.30 < μ < 76.13

b. 76.13 < μ < 86.30

c. 76.03 < μ < 86.40

d. 86.40 < μ < 76.03

Answer 1