12 May Q-5a. One of the important features of a camera is the bat
Q-5a. One of the important features of a camera is the battery life
as measured by the number of shots taken until the battery
needs to be recharged. The data at left contain the battery
life of 27 subcompact cameras and 15 compact cameras.
Assuming that the population variances from both types of
digital cameras are equal, is there evidence of a difference
in the mean battery life between the two types of digital
cameras at the 95% confidence level? (5 pts.)
A real estate Association in a suburban community would like to study the relationship between the size of a single-family house (as measured by number of rooms) and the selling price of the house (in thousands of dollars). Two different neighborhoods are included in the study, one on the east side of the community (=0) and the other on the west side (=1). A random sample of 20 houses was selected with the results given at left.
_____________________________________________________________
Q-6a. State the multiple regression equation that predicts the selling price
based on the number of rooms in the neighborhood. (5 pts.)
_____________________________________________________________
Q-6b. Interpret the regression coefficients. (5 pts.)
_____________________________________________________________
Q-6c. Predict the selling price for a house with 10 rooms that is located in a
East-side neighborhood. Explain your findings so that your non-
quantitative partner will understand them. (5 pts.)
_____________________________________________________________
Q-6d. Compute and interpret the adjusted r2. (5 pts.)
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