evalisezamot
02.06.2021 •
Mathematics
Mary is planning to survey a sample of women to find out how much money the average woman spent on lipstick last year. What sample size will she need, if she wants to be 95% confident that her sample mean is no more than $4 away from the population mean, and assuming a standard deviation of $20? A. 100
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Ответ:
The required sample size = 97
Step-by-step explanation:
If prior population standard deviation is known, then the minimum sample size can be computed as:
,where z* = critical z-value
= population standard deviation
E = Margin of error
As per given,
Critical value for 95% confidence = 1.96
Hence, the required sample size = 97
Ответ: