A sample of 40 observations is selected from a normal population. The sample mea
ID: 2632319 • Letter: A
Question
A sample of 40 observations is selected from a normal population. The sample mean is 64, and the population standard deviation is 8. Use the 0.01 significance level.
H1: ? ? 65
What is the value of the test statistic? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
Value of the test statistic_________
H0: ? = 65H1: ? ? 65
What is the value of the test statistic? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
Value of the test statistic_________
Explanation / Answer
Test statistic z = (xbar - mu)/(stdev/sqrt(n))
population stdev = 8; sample mean = 64 and sample size n = 40; mu = 65
Test statistic z = (64 - 65)/(8/sqrt(40)) = -0.79
p value = 0.4295