12. Regression

"Concrete Use the results of Problem 15 from Section 12.3 to answer the following questions:

c. Predict the 28-day strength of concrete whose 7-day strength is 2550 psi."

"In Exercises 19-24, construct the indicated prediction interval and interpret the results.

19. Construct a 90% prediction interval for the amount of milk produced in Exercise 9 when there are an average of 9275 thousand milk cows."

"American Black Bears Use the results of Problem 18 from Section 12.3 to answer the following questions:

a. Predict the mean weight of American black bears with a total length of 154.5 cm"

[DATA] Crickets make a chirping noise by sliding their wings rapidly over each other. Perhaps you have noticed that the number of chirps seems to increase with the temperature. The following table lists the temperature (in degrees Fahrenheit, °F) and the number of chirps per second for the striped ground cricket.

b. Compute the standard error of the estimate, Sₑ.

[NOW WORK] Using the sample data from Problem 5 in Section 12.3,

d. Construct a 95% prediction interval for the value of y if x=7.

"In Exercises 19-24, construct the indicated prediction interval and interpret the results.

23. Construct a 99% prediction interval for the top speed of an electric car in Exercise 17 that takes 5.9 seconds to accelerate from 0 to 60 miles per hour."

Standard Error of Estimate A random sample of 118 different female statistics students is obtained and their weights are measured in kilograms and in pounds. Using the 118 paired weights (weight in kg, weight in lb), what is the value of se? For a female statistics student who weighs 100 lb, the predicted weight in kilograms is 45.4 kg. What is the 95% prediction interval?