Questions from Business Statistics

Q: Will pˆ from a random sample of size 400 tend to be

Will pˆ from a random sample of size 400 tend to be closer to the actual value of the population proportion when p = 0.4 or when p = 0.7? Provide an explanation for your choice.

Q: A random sample will be selected from the population of all adult

A random sample will be selected from the population of all adult residents of a particular city. The sample proportion pˆ will be used to estimate p, the proportion of all adult residents who are reg...

Q: In response to budget cuts, county officials are interested in learning

In response to budget cuts, county officials are interested in learning about the proportion of county residents who favor closure of a county park rather than closure of a county library. In a random...

Q: Consider taking a random sample from a population with p = 0

Consider taking a random sample from a population with p = 0.25. a. What is the standard error of p ˆ for random samples of size 400? b. Would the standard error of pˆ be smaller for random samples...

Q: In a survey on supernatural experiences, 722 of 4013 adult Americans

In a survey on supernatural experiences, 722 of 4013 adult Americans reported that they had seen a ghost (“What Supernatural Experiences We’ve Had,” USA TODAY, February 8, 2010). Assume that this samp...

Q: Suppose that county planners are interested in learning about the proportion of

Suppose that county planners are interested in learning about the proportion of county residents who would pay a fee for a curbside recycling service if the county were to offer this service. Two diff...

Q: Describe how each of the following factors affects the width of the

Describe how each of the following factors affects the width of the large-sample confidence interval for p: a. The confidence level b. The sample size c. The value of pˆ

Q: Based on data from a survey of 1200 randomly selected Facebook users

Based on data from a survey of 1200 randomly selected Facebook users (USA TODAY, March 24, 2010), a 90% confidence interval for the proportion of all Facebook users who say it is not OK to “friend” so...

Q: The study “The Demographics of Social Media Users” (Pew

The study “The Demographics of Social Media Users” (Pew Research Center, August 19, 2015) reported that 72% of adult American Internet users use Facebook. The 72% figure was based on a representative...

Q: For the study described in the previous exercise, use the fivestep

For the study described in the previous exercise, use the fivestep process for estimation problems (EMC3) to construct and interpret a 90% confidence interval for the proportion of adult American Inte...