95% = mean ± 1.96 SEm
SEm = SD/√n
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?
2 answers
130
1 answer