Questions from Business Statistics

Q: Use the survey results in the table to investigate differences in education

Use the survey results in the table to investigate differences in education level attained among different age groups in the United States.

Q: An SAT preparation course wants to advertise based on the analyses we’ve

An SAT preparation course wants to advertise based on the analyses we’ve seen that raising your SAT scores will increase your eventual earnings. Is that conclusion supported by these analyses?

Q: The coach from Exercise 2 called a team meeting to summarize the

The coach from Exercise 2 called a team meeting to summarize the results from his study. Would it be a good strategy to tell the players that all they need to do is to shoot more and the goals will fo...

Q: In Chapter 6, we looked at data from the National Oceanic

In Chapter 6, we looked at data from the National Oceanic and Atmospheric Administration about their success in predicting hurricane tracks. Here is a scatterplot of the error (in nautical miles) for...

Q: The dataset Student survey contains 299 responses to a student survey from

The dataset Student survey contains 299 responses to a student survey from a statistics project. The questions asked included: How would you rate yourself politically? (1=Far left, 9 = Far right) What...

Q: The 2013 World Drug Report investigated the prevalence of drug use as

The 2013 World Drug Report investigated the prevalence of drug use as a percentage of the population aged 15 to 64. Data from 32 European countries are shown in the following scatterplot and regressio...

Q: Climate scientists have been observing the extent of sea ice in the

Climate scientists have been observing the extent of sea ice in the northern Arctic using satellite observations. Many have expressed concern because in recent decades the extent of sea ice has declin...

Q: How does the price of a house depend on its size?

How does the price of a house depend on its size? Data from Saratoga, New York, on 1063 randomly selected houses that had been sold include data on price ($1000s) and size (1000 ft2), producing the fo...

Q: Exercise 23 shows computer output examining the association between Arctic sea ice

Exercise 23 shows computer output examining the association between Arctic sea ice extent and global mean temperature. Find a 95% confidence interval for the slope and interpret it in context.

Q: Exercise 24 shows computer output examining the association between the sizes

Exercise 24 shows computer output examining the association between the sizes of houses and their sale prices. 1. Check the assumptions and conditions for inference. 2. Find a 95% confidence interval...