A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. Assuming a population standard deviation of 6 hours, what is the required sample size if the error should be less than ½ hour with a 95% level of confidence?
A) 554
B) 130
C) 35
D) 393

Question

Quizplus · Accepted Answer

To find the required sample size, use the formula for sample size in estimating a population mean: n = (Z*σ/E)^2. For a 95% confidence level, Z is 1.96. Given σ = 6 and E = 0.5, n = (1.96*6/0.5)^2 = 554.04, rounded to 554.

A Group of Statistics Students Decided to Conduct a Survey