Questions from Statistics Principles

Q: An economist wants to determine the relation between one’s FICO score,

An economist wants to determine the relation between one’s FICO score, x, and the interest rate of a 36-month auto loan, y. The given data represent the interest rate (in percent) a bank would offer o...

Q: A pediatrician wants to determine the relation that exists between a child’s

A pediatrician wants to determine the relation that exists between a child’s height, x, and head circumference, y. She randomly selects 11 children from her practice, measures their heights and head c...

Q: The American black bear (Ursus americanus) is one of eight

The American black bear (Ursus americanus) is one of eight bear species in the world. It is the smallest North American bear and the most common bear species on the planet. In 1969, Dr. Michael R. Pel...

Q: The following data represent the speed at which a ball was hit

The following data represent the speed at which a ball was hit (in miles per hour) and the distance it traveled (in feet) for a random sample of home runs in a Major League baseball game. (a) Find the...

Q: The following data represent the maximum wind speed (in knots)

The following data represent the maximum wind speed (in knots) and atmospheric pressure (in millibars) for a random sample of hurricanes that originated in the Atlantic Ocean. (a) Find the least-squa...

Q: Example 5 in Section 4.1 on page 178 discussed the

Example 5 in Section 4.1 on page 178 discussed the effect of cola consumption on bone mineral density in the femoral neck of women. (a) Find the least-squares regression line treating cola consumption...

Q: An engineer wants to determine how the weight of a car,

An engineer wants to determine how the weight of a car, x, affects gas mileage, y. The following data represent the weights of various domestic cars and their miles per gallon in the city for the 2015...

Q: Explain why it does not make sense to find a least-

Explain why it does not make sense to find a least-squares regression line for the CEO Performance data from Problem 33 in Section 4.1.

Q: Given a choice, would you conduct a study using an observational

Given a choice, would you conduct a study using an observational study or a designed experiment? Why?

Q: Explain why it does not make sense to find a least-

Explain why it does not make sense to find a least-squares regression line for the Bear Market data from Problem 34 in Section 4.1.