Whenever the population standard deviation is unknown, which distribution is used in developing an interval estimate for a population mean?
A) standard distribution
B) z distribution
C) binomial distribution
D) t distribution
Correct Answer:
Verified
Q24: A bank manager wishes to estimate the
Q25: Whenever using the t distribution in interval
Q26: The t distribution should be used whenever
Q27: A sample of 26 elements from a
Q28: When the level of confidence increases, the
Q30: A random sample of 144 observations has
Q31: An auto manufacturer wants to estimate the
Q33: As the number of degrees of freedom
Q34: It is known that the variance of
Q39: If we change a 95% confidence interval
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