Questions from Business Statistics

Q: The distribution of scores on a statistics test for a particular class

The distribution of scores on a statistics test for a particular class is skewed to the left. The professor wants to predict the maximum score and so wants to understand the distribution of the sample...

Q: A machine is supposed to fill cans with 16 oz of soup

A machine is supposed to fill cans with 16 oz of soup. Of course, there will be some variation in the amount actually dispensed, and measurement errors are often approximately Normally distributed. Th...

Q: The 95% confidence interval for the number of teens in Exercise

The 95% confidence interval for the number of teens in Exercise 5 who reported that they went online several times daily is from 53% to 59%. 1. Interpret the interval in this context. 2. Explain the m...

Q: In a 2015 Pew Research study on trends in marriage and family

In a 2015 Pew Research study on trends in marriage and family (www.pewsocialtrends.org/2015/12/17/1-the-american-family-today/), 53% of randomly selected parents said that they never spank their child...

Q: An Ipsos/Reuters poll of 2214 U.S. adults

An Ipsos/Reuters poll of 2214 U.S. adults voters in April and May 2017 asked a standard polling question of whether the United States was headed in the Right Direction or was on the Wrong Track. 54% s...

Q: The Gallup Poll described in Exercise 6 also asked about smoking.

The Gallup Poll described in Exercise 6 also asked about smoking. Only 18% of those polled reported that they smoked. 1. Calculate the margin of error for the proportion of all American adults who smo...

Q: Consider the poll of Exercise 15. 1. Are the

Consider the poll of Exercise 15. 1. Are the assumptions and conditions met? 2. Would the margin of error be larger or smaller for 95% confidence? Explain.

Q: In Exercise 14, we saw that 53% of surveyed parents

In Exercise 14, we saw that 53% of surveyed parents don’t spank their children. 1. Are the conditions for constructing a confidence interval met? 2. Would the margin of error be larger or smaller for...

Q: It believed that as many as 25% of adults over 50

It believed that as many as 25% of adults over 50 never graduated from high school. We wish to see if this percentage is the same among the 25 to 30 age group. 1. How many of this younger age group mu...

Q: National Center for Health Statistics compiles data on the length of stay

National Center for Health Statistics compiles data on the length of stay by patients in short-term hospitals and publishes its findings in Vital and Health Statistics. Data from a sample of 39 male p...