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bchagnard2122
27.07.2020 •
Mathematics
Family Size. You selected a random sample of n = 31 families in your neighborhood and found the mean family size for the sample equal to 3.1, the standard deviation for the sample is 1.42? What is the 90% confidence interval for the estimate?
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Ответ:
Step to step explanation:
Confidence interval for mean, when population standard deviation is unknown:
, where
= sample mean
n= sample size
s= sample standard deviation
We assume the family size is normal distributed.
Given, n= 31 ,
, s= 1.42 ,
Critical t value for
and degree of 30 freedom
The required confidence interval:
Hence, the 90% confidence interval for the estimate = (2.67, 3.53)
Ответ:
disease
Explanation: