The WISC scores (similar to IQ test scores) of a sample of n = 20 5^th graders will be used to create a 99% confidence interval for the mean WISC score of all 5^th graders. What is the correct t* multiplier for this interval? A) 2.86 B) 3.55 C) 2.54 D) 2.85

Question

Quizplus · Accepted Answer

For a 99% confidence interval with n = 20 (which means degrees of freedom = 19), the correct t* multiplier according to most t-distribution tables is approximately 2.86.

The WISC Scores (Similar to IQ Test Scores) of a Sample