tyneshiajones124
26.08.2019 •
Mathematics
Suppose germination periods, in days, for grass seed are normally distributed and have a known population standard deviation of 6 days and an unknown population mean. a random sample of 21 types of grass seed is taken and gives a sample mean of 34 days. find the margin of error for the confidence interval for the population mean with a 99% confidence level.
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Ответ:
3.725
Step-by-step explanation:
Formula of Margin of Error for (n<30):-
Given : Sample size : n= 21
Level of confidence = 0.99
Significance level :
By using the t-distribution table ,
Critical value :
Standard deviation:
Then, we have
Hence, the margin of error for the confidence interval for the population mean with a 99% confidence level=3.725
Ответ: