Questions from Business Statistics

Q: The USA Snapshot titled “Have a Nice Trip” (USA

The USA Snapshot titled “Have a Nice Trip” (USA TODAY, November 17, 2015) summarized data from a survey of 1000 U.S. adults who had traveled by air at least once in the previous year. The Snapshot inc...

Q: Business Insider reported that a study commissioned by eBay Motors found that

Business Insider reported that a study commissioned by eBay Motors found that nearly 40% of millennials who drive a car that is more than 5 years old have named their cars (“Millennials Have an Odd Ha...

Q: An article in the Chicago Tribune (August 29, 1999)

An article in the Chicago Tribune (August 29, 1999) reported that in a poll of residents of the Chicago suburbs, 43% felt that their financial situation had improved during the past year. The followin...

Q: Suppose that a city planning commission wants to know the proportion of

Suppose that a city planning commission wants to know the proportion of city residents who support installing streetlights in the downtown area. Two different people independently selected random samp...

Q: For each of the following choices, explain which one would result

For each of the following choices, explain which one would result in a wider large-sample confidence interval for p: a. 90% confidence level or 95% confidence level b. n = 100 or n = 400

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 95% confidence interval for the proportion of all Facebook users who say it is OK for someone to “fr...

Q: Appropriate use of the interval / requires a large sample

Appropriate use of the interval requires a large sample. For each of the following combinations of n and p ˆ, indicate whether the sample size is large enough for this interval to be approp...

Q: The formula used to calculate a large-sample confidence interval for

The formula used to calculate a large-sample confidence interval for p is What is the appropriate z critical value for each of the following confidence levels? a.90% b. 99% c. 80%

Q: The article “Career Expert Provides DOs and DON’Ts for Job Seekers

The article “Career Expert Provides DOs and DON’Ts for Job Seekers on Social Networking” (CareerBuilder.com, August 19, 2009) included data from a survey of 2667 hiring managers and human resource pro...

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

For the study described in the previous exercise, use the five-step process for estimation problems (EMC3) to construct and interpret a 95% confidence interval for the proportion of hiring managers a...