Questions from Business Statistics

Q: The Super Bowl, watched by close to 200 million Americans,

The Super Bowl, watched by close to 200 million Americans, is also a big event for advertisers. The file Super Bowl Ad Ratings contains the rating of ads that ran between the opening kick-off and the...

Q: Is there a difference in the yields of different types of investments

Is there a difference in the yields of different types of investments? The file CD Rates contains the yields for a one-year certificate of deposit (CD) and a five-year CD sold by 46 financial institut...

Q: If X = 75, S = 24, and n =

If X = 75, S = 24, and n = 36, and assuming that the population is normally distributed, construct a 95% confidence interval estimate for the population mean, µ.

Q: The following table, stored in Energy Sources, contains the 2018

The following table, stored in Energy Sources, contains the 2018 sources of electricity in the United States as reported by the Energy Information Administration. a. Construct a Pareto chart. b. What...

Q: The file Fast Casual contains the amount that a sample of 15

The file Fast Casual contains the amount that a sample of 15 customers spent for lunch ($) at a fast casual restaurant: a. Construct a 95% confidence interval estimate for the population mean amount s...

Q: In Problems 9.18, 9.19, and 9

In Problems 9.18, 9.19, and 9.20, what is your statistical decision if the alternative hypothesis, H1, is µ, # 50? Data from Problem 9.20: In Problems 9.18 and 9.19, what are the critical values of t...

Q: If you use a 0.05 level of significance in a

If you use a 0.05 level of significance in a two-tail hypothesis test, what is your decision rule for rejecting a null hypothesis that the population mean equals 500 if you use the Z test?

Q: How do the boxplots for distributions of varying shapes differ?

How do the boxplots for distributions of varying shapes differ?

Q: If, in a sample of n = 16 selected from a

If, in a sample of n = 16 selected from a left-skewed population, X = 65, and S = 21, would you use the t test to test the null hypothesis H0: µ, = 60? Discuss.

Q: If, in a sample of n = 160 selected from a

If, in a sample of n = 160 selected from a left-skewed population, X = 65, and S = 21, would you use the t test to test the null hypothesis H0: µ, = 60? Discuss.