Questions from Business Statistics

Q: Explain why there is sample-to-sample variability in pˆ

Explain why there is sample-to-sample variability in pˆ but not in p.

Q: Consider the following statement: An inspector selected 20 eggs at random

Consider the following statement: An inspector selected 20 eggs at random from the eggs processed at a large egg production facility. These 20 eggs were tested for salmonella, and the proportion of th...

Q: Consider the following statement: The proportion of all students enrolled at

Consider the following statement: The proportion of all students enrolled at a particular university during 2017 who lived on campus was 0.21. a. Is the number that appears in boldface in this statem...

Q: A random sample will be selected from a population that has a

A random sample will be selected from a population that has a proportion of successes p = 0.70. Determine the mean and standard deviation of the sampling distribution of pˆ for each of the following s...

Q: For which of the sample sizes given in the previous exercise would

For which of the sample sizes given in the previous exercise would the sampling distribution of pˆ be approximately normal if p = 0.70? If p = 0.30?

Q: The article “fewer americans are reading, but Don't blame the

The article “fewer americans are reading, but Don't blame the millennials” (Los Angeles Times, october 9, 2016) indicates that 80% of millennials (those age 18–29) have read a book in the last year. S...

Q: The company Digital Trends reported that 48% of Americans have shared

The company Digital Trends reported that 48% of Americans have shared passwords for TV and movie streaming (“americans Know they Shouldn't Share their passwords, but Do it anyway,” february 18, 2016,...

Q: Suppose that the actual proportion of students at a particular college who

Suppose that the actual proportion of students at a particular college who use public transportation to travel to campus is 0.15. In a study of parking needs at the campus, college administrators woul...

Q: In a survey of a representative sample of adults in the United

In a survey of a representative sample of adults in the United States, participants were asked if they agreed or disagreed with the statement “I can’t imagine my li...

Q: The article “an alternative Vote: applying Science to the teaching

The article “an alternative Vote: applying Science to the teaching of Science” (The Economist, may 12, 2011) describes an experiment conducted at the University of British Columbia. A total of 850 eng...