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28.11.2019 •
Mathematics
An admissions director wants to estimate the mean age of all students enrolled at a college. the estimate must be within 1.3 years of the population mean. assume the population of ages is normally distributed.(a) determine the minimum sample size required to construct a 90% confidence interval for the population mean. assume the population standard deviation is 1.5 years.
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Ответ:
4
Step-by-step explanation:
For given Population standard deviation
, the formula to sample size is given by :-
, where z* = Two-tailed critical value.
E = Margin of error.
Given :
years
We know that , Critical value for 90% confidence interval : z* = 1.645
Margin of error : E=1.3 years
Then, the minimum sample size required to construct a 90% confidence interval for the population mean will be :-
Hence, the minimum sample size required = 4
Ответ:
ITS 63
Step-by-step explanation:
JUST DID DA TEST CUZ