Questions from Business Statistics

Q: Use the formula for the standard error of pˆ to explain why

Use the formula for the standard error of pˆ to explain why increasing the sample size decreases the standard error.

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 do not...

Q: If two statistics are available for estimating a population characteristic, under

If two statistics are available for estimating a population characteristic, under what circumstances might you choose a biased statistic over an unbiased statistic?

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

A random sample will be selected from the population of all students enrolled at a large college. The sample proportion pˆ will be used to estimate p, the proportion of all students who use public tra...

Q: A researcher wants to estimate the proportion of city residents who favor

A researcher wants to estimate the proportion of city residents who favor spending city funds to promote tourism. Would the standard error of the sample proportion pˆ be smaller for random samples of...

Q: A researcher wants to estimate the proportion of property owners who would

A researcher wants to estimate the proportion of property owners who would pay their property taxes one month early if given a $50 reduction in their tax bill. Would the standard error of the sample p...

Q: A large online retailer is interested in learning about the proportion of

A large online retailer is interested in learning about the proportion of customers making a purchase during a particular month who were satisfied with the online ordering process. A random sample of...

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

Consider taking a random sample from a population with p = 0.40. a. What is the standard error of pˆ for random samples of size 100? b. Would the standard error of pˆ be greater for samples of size...

Q: The report “2007 Electronic Monitoring & Surveillance Survey” (American

The report “2007 Electronic Monitoring & Surveillance Survey” (American Management Association) summarized a survey of 304 U.S. businesses. The report stated that 91 of the 304 businesses had fired wo...

Q: The use of the formula for margin of error requires a large

The use of the formula for margin of error requires a large sample. For each of the following combinations of n and pˆ, indicate whether the sample size is large enough for use of this formula to be a...