Questions from Business Statistics

Q: For which of the following combinations of sample size and population proportion

For which of the following combinations of sample size and population proportion would the standard deviation of pˆ be smallest? n = 40 p = 0.3 n = 60 p = 0.4 n = 100 p = 0.5

Q: Explain why the standard deviation of pˆ is equal to 0 when

Explain why the standard deviation of pˆ is equal to 0 when the population proportion is equal to 1.

Q: For which of the following sample sizes would the sampling distribution of

For which of the following sample sizes would the sampling distribution of pˆ be approximately normal when p = 0.2? When p = 0.8? When p = 0.6? n = 10 n = 25 n = 50 n = 100

Q: A random sample of size 300 is to be selected from a

A random sample of size 300 is to be selected from a population. Determine the mean and standard deviation of the sampling distribution of pˆ for each of the following population proportions. a. p =...

Q: For which of the population proportions given in the previous exercise would

For which of the population proportions given in the previous exercise would the sampling distribution of pˆ be approximately normal if n = 40? If n = 75?

Q: The article “facebook etiquette at work” (USA TODAY,

The article “facebook etiquette at work” (USA TODAY, March 24, 2010) reported that 56% of people participating in a survey of social network users said it was not OK for someone to “friend” his or her...

Q: Suppose that a particular candidate for public office is favored by 48

Suppose that a particular candidate for public office is favored by 48% of all registered voters in the district. A polling organization will take a random sample of 500 of these voters and will use p...

Q: The article “the average american is in credit card Debt,

The article “the average american is in credit card Debt, no matter the economy” (Money Magazine, february 9, 2016) reported that only 35% of credit card users pay...

Q: The article “Long-term effects of tongue piercing—a

The article “Long-term effects of tongue piercing—a case-control Study” (Clinical Oral Investigations [2012]: 231– 237) describes a study of 46 males with pierced tongues. Suppose that it is reasonabl...

Q: The report “the role of two-Year institutions in fourYear

The report “the role of two-Year institutions in fourYear Success” (national Student clearinghouse research center, 2015, nscresearchcenter.org/wp-content/uploads /Snapshotreport17-2Yearcontributions....