SOLUTION: The mean of 20 degrees Celsius is obtained for 60 temperatures on 60 different days. Assuming that standard deviation is 1.5 degrees Celsius, test the claim that the population mea

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Question 875420: The mean of 20 degrees Celsius is obtained for 60 temperatures on 60 different days. Assuming that standard deviation is 1.5 degrees Celsius, test the claim that the population mean is 22 degrees Celsius. Use a 0.05 significance level.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Ho: mean = 22 claim
Ha: mean < 22
z = +%2820-22%29%2F%28%281.5%29%2Fsqrt%2860%29%29 = -2/ .1936 = -10.328
P(z < - 10.328) = ~.0 < .05, reject claim mean is 22