Data Set 8-4 :A random sample of 64 students produced the following statistics: = 18.00, = 7.00.
-The 95 percent confidence interval about the mean in Data Set 8-4 is
A) 16.25 to 19.75
B) 17.78 to 18.22
C) 4 to 32

Question

Quizplus · Accepted Answer

The 95% confidence interval for the mean is calculated using the formula: mean ± (Z * (standard deviation / sqrt(n))), where Z is the Z-score for 95% confidence (approximately 1.96), the standard deviation is 7, and n is the sample size (64). This calculation results in an interval of 16.25 to 19.75.

Data Set 8-4 :A Random Sample of 64 Students Produced