9) The 95% confidence limits where, for 50 people, we have a mean of 40 and a standard deviation of 8 are:
A) 32 and 48
B) 37.74 and 42.26
C) 37.43 and 42.57
D) 38.87 and 41.13

Question

Quizplus · Accepted Answer

The 95% confidence interval is calculated using the formula: mean ± (Z * (standard deviation/√n)). For a 95% confidence level, Z is approximately 1.96. Plugging in the values: 40 ± (1.96 * (8/√50)) gives the interval 37.43 to 42.57.

9) the 95% Confidence Limits Where, for 50 People, We