Stats Homework 3c – Flashcards
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Which of the following is NOT a property of the Student t distribution?
answer
The standard deviation of the Student t distribution is sequals=1.
question
The _______ is the best point estimate of the population mean.
answer
The
sample mean
is the best point estimate of the population mean.
question
Which of the following calculations is NOT derived from the confidence interval?
answer
The population mean, mean equals upper confid - lower c
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Which of the following is NOT a requirement for constructing a confidence interval for estimating a population mean with sigmaσ known?
answer
The confidence level is 95%.
question
Which of the following would be a correct interpretation of a 99% confidence interval such as 4.1less than
answer
We are 99% confident that the interval from 4.1 to 5.6 actually does contain the true value of muμ.
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Which of the following is NOT an equivalent expression for the confidence interval given by 161.7less than
answer
161.7plus or minus±27.8
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Which of the following is NOT required to determine minimum sample size to estimate a population mean?
answer
The size of the population, N
question
The statistics of nequals=22 and sequals=14.3 result in this 95% confidence interval estimate of sigmaσ: 11.0less than
answer
No. The format implies that sequals=15.7, but s is given as 14.3. In general, a confidence interval for sigmaσ does not have s at the center.
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The _____________ distribution is used to develop confidence interval estimates of variances or standard deviations.
answer
The
Chi-square
distribution is used to develop confidence interval estimates of variances or standard deviations.
question
Which of the following is NOT a property of the chi-square distribution?
answer
The mean of the chi-square distribution is 0.
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