briannawoods13
27.08.2019 •
Mathematics
Suppose the total snowfalls per year in a city are normally distributed. if the population standard deviation is 13 inches, what minimum sample size is needed to be 95% confident that the sample mean is within 4 inches of the true population mean?
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Ответ:
41
Step-by-step explanation:
Given : Significance level :
Critical value :
Margin of error :
Standard deviation:
The formula to find the sample size :
Then, we have
Hence, the minimum sample size needed= 41.
Ответ:
The answer is C. The leading coefficient is -3 and the constants is 2.
explanation: I just took the test