Question

Recall the chapter example which described the fact that the mean IQ in large, diverse and the standard deviation is 15. Your sample of 300 members populations is 100 your community gave you a mean 99% confidence level for this sample. Which of the following your answer? the margin of error for the figures comes closest to 1Q score of 1os. Calculate t A. 10.95 B. ±1.96 C. 12.23 D. 11.16 E. None of the above

Answer 1

Given Information:

Population size = n = 300

standard deviation = σ = 15

confidence level = 99%

Required Information:

Margin of error = ?

Explanation:

The margin of error is a measure of the effectiveness of your survey.

Margin of error = z*(σ/√n)

z-score corresponding to 99% confidence level = 2.58

Margin of error = ±2.58*(15/√300)

Margin of error = ±2.58*(0.866)

Margin of error = ±2.23

Hence the correct option is C ±2.23