Questions from Statistics

Q: If the correlation between height and weight of a large group of

If the correlation between height and weight of a large group of people is 0.67, find the coefficient of determination (as a percentage) and explain what it means. Assume that height is the predictor...

Q: Does a correlation of -0.70 or +0.

Does a correlation of -0.70 or +0.50 give a larger coefficient of determination? We say that the linear relationship that has the larger coefficient of determination is more strongly correlated. Which...

Q: Some investors use a technique called the “Dogs of the Dow

Some investors use a technique called the “Dogs of the Dow” to invest. They pick several stocks that are performing poorly from the Dow Jones group (which is a composite of 30 well known stocks) and i...

Q: Suppose a doctor telephones those patients who are in the highest 10

Suppose a doctor telephones those patients who are in the highest 10% with regard to their recently recorded blood pressure and asks them to return for a clinical review. When she retakes their blood...

Q: Suppose a surfer wanted to learn if surfing during a certain time

Suppose a surfer wanted to learn if surfing during a certain time of day made one less likely to be attacked by a shark. Using the Shark Attacks Worldwide data set, which variables could the surfer us...

Q: The equation for the regression line relating the salary and the year

The equation for the regression line relating the salary and the year first employed is given above the figure. a. Report the slope and explain what it means. b. Either interpret the intercept (4,255,...

Q: The following figure shows the relationship between the number of miles per

The following figure shows the relationship between the number of miles per gallon on the highway and that in the city for some cars. a. Report the slope and explain what it means. b. Either interpret...

Q: The following table shows the weights and prices of some turkeys at

The following table shows the weights and prices of some turkeys at different supermarkets. a. Make a scatterplot with weight on the x-axis and cost on the y-axis. Include the regression line on your...

Q: The table shows the calories in a five-ounce serving and

The table shows the calories in a five-ounce serving and the % alcohol content for a sample of wines. (Source: healthalicious.com) a. Make a scatterplot using % alcohol as the independent variable an...

Q: The scatterplot shows the average teacher pay and the per pupil expenditure

The scatterplot shows the average teacher pay and the per pupil expenditure for each of the 50 states and the District of Columbia. The regression equation is also shown. (Source: The 2017 World Alman...