Suppose you are testing the null hypothesis that a population mean is less than or equal to 46,against the alternative hypothesis that the population mean is greater than 46.The sample size is 25 and alpha =.05.If the sample mean is 50 and the population standard deviation is 8,the observed z value is _______.
A)2.5
B)-2.5
C)6.25
D)-6.25
E)12.5

Question

Quizplus · Accepted Answer

The observed z value is calculated using the formula: z = (sample mean - population mean) / (population standard deviation / sqrt(sample size)). Substituting the given values: z = (50 - 46) / (8 / sqrt(25)) = 4 / (8 / 5) = 4 / 1.6 = 2.5.

Suppose You Are Testing the Null Hypothesis That a Population