Questions from Statistics

Q: Workers and senior-level bosses were asked if it was seriously

Workers and senior-level bosses were asked if it was seriously unethical to monitor employee e-mails; the results are summarized in the following table (based on data from a Gallup poll). Use a 0.05 s...

Q: In a USA Today article about an experimental vaccine for children,

In a USA Today article about an experimental vaccine for children, the following statement appeared: “In a trial involving 1602 children, only 14 (1%) of the 1070 who received the va...

Q: Of the 98 participants in a drug trial who were given a

Of the 98 participants in a drug trial who were given a new experimental treatment for arthritis, 56 showed improvement. Of the 92 participants given a placebo, 49 showed improvement. Construct a two-...

Q: A random sample of 760 subjects was obtained, and each was

A random sample of 760 subjects was obtained, and each was tested for left-handed writing. Among the 240 males, 23 wrote with their left hand. Among the 520 females, 65 wrote with their left hand. The...

Q: The table below lists survey results obtained from a random sample of

The table below lists survey results obtained from a random sample of crime victims (based on data from the U.S. Department of Justice). Use a 0.01 significance level to test the claim that the type o...

Q: The table below summarizes results from a survey of males aged 15

The table below summarizes results from a survey of males aged 15 or older living in the Minhang District of China (based on data from “Cigarette Smoking in China”...

Q: What is a two-way table? What are the entries

What is a two-way table? What are the entries in its cells?

Q: Explain what we mean by the observed frequency and expected frequency for

Explain what we mean by the observed frequency and expected frequency for each cell in a two-way table. What notation is used for the expected and observed frequencies? How do we calculate expected fr...

Q: Briefly explain the meaning of the  2 statistic. What does

Briefly explain the meaning of the  2 statistic. What does it tell us if the value of this statistic is small? How do you use the  2 statistic to decide whether to reject the null hypothesis?

Q: Use subjective probability to estimate the probability of randomly selecting a car

Use subjective probability to estimate the probability of randomly selecting a car and selecting one that is black.