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A simple random sample of 5-year-old boys from a city is obtained and their weights are listed below.
40 38 58 41
Use 0.05 significance level to find the test statistic to test the claim that the population mean is smaller than 50.
Assume that population has normal distribution.
A. -1.243
B. 1.243
C. -1.390
D. 1.390
E. None of the other choice is correct
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