Mathematics, 11.12.2019 20:31 jojo492192
The drying times for a certain type of cement are normally distributed with a standard deviation of 30 minutes. a researcher wishes to estimate the mean drying time for this type of cement. find the sample size needed to assure with 68.26% confidence that the sample mean will not differ from the population mean by more than 5 minutes.
a. 31
b. 26
c. 29
d. 38
e. 30
f. 27
g. 32
h. 36
Answers: 2
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