Questions from Essentials of Statistics

Q: The daily charges, in dollars, for a sample of 15

The daily charges, in dollars, for a sample of 15 hotels and motels operating in South Carolina are provided on the WeissStats site. The data were found in the report South Carolina Statistical Abstra...

Q: A study by researchers at the University of Maryland addressed the question

A study by researchers at the University of Maryland addressed the question of whether the mean body temperature of humans is 98.6◦F. The results of the study by P. Mackowiak et al. appeared in the ar...

Q: Data on salaries in the public school system are published annually in

Data on salaries in the public school system are published annually in Ranking of the States and Estimates of School Statistics by the National Education Association. The mean annual salary of (public...

Q: The number of cell phone users has increased dramatically since 1987.

The number of cell phone users has increased dramatically since 1987. According to the Semiannual Wireless Survey, published by the Cellular Telecommunications & Internet Association, the mean local m...

Q: This exercise can be done individually or, better yet, as

This exercise can be done individually or, better yet, as a class project. For the pretzel-packaging hypothesis test in Example 9.1 on page 352, the null and alternative hypotheses are, respectively,...

Q: As we mentioned on page 378, the following relationship holds between

As we mentioned on page 378, the following relationship holds between hypothesis tests and confidence intervals for one-mean z-procedures: For a two-tailed hypothesis test at the significance level α,...

Q: We introduced one-sided one-mean z-intervals.

We introduced one-sided one-mean z-intervals. The following relationship holds between hypothesis tests and confidence intervals for one-mean z-procedures: For a left-tailed hypothesis test at the sig...

Q: We introduced one-sided one-mean z-intervals.

We introduced one-sided one-mean z-intervals. The following relationship holds between hypothesis tests and confidence intervals for one-mean z-procedures: For a right-tailed hypothesis test at the si...

Q: What is the difference in assumptions between the one-mean t

What is the difference in assumptions between the one-mean t-test and the one-mean z-test?

Q: Suppose that you want to perform a hypothesis test for a population

Suppose that you want to perform a hypothesis test for a population mean based on a small sample but that preliminary data analyses indicate either the presence of outliers or that the variable under...