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

Option A) 2.5

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 46

Sample mean, = 50

Sample size, n = 25

Alpha, α = 0.05

Population standard deviation, σ = 8

First, we design the null and the alternate hypothesis

Formula:

Putting all the values, we have

Option A) 2.5

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