Question

A researcher wants to estimate the average number of days/week UNBC students engage in physical exercises in response to a national fitness magazine article suggesting that the average student in Canada does not engage in physical exercises. She is planning to select a simple random sample of students using the list of currently enrolled students at UNBC after receiving approval from the Research Ethics Board. Assuming the researcher took a sample of 50 participants and observed a sample average engagement in physical exercise as 2.5/ week, find the 99% confidence interval of this estimate if the population standard deviation is 1.5.

Select one: a. 1.42 to 4.21 b. 1.95 to 3.05 c. 2.08 to 2.92 d. 2.15 to 2.85

Answer 1

solution:- 99% contidence internal - T + 1812 319 - 2-5 t 2.576 X 1.5 vso B (1.95 to 3-05)