A consumer magazine collects reader reports for the years of service and the annual repair costs for household refrigerators. Twelve reports chosen at random from those of a particular brand gave the following results:
a. Draw a scatter diagram.
b. Find the regression line to estimate repair costs from the years of service.
c. Estimate the repair costs for a 9 year old refrigerator of this brand.
d. Estimate the repair costs for a 30 year old refrigerator of this brand. What can you say about this estimate?
e. Do the data support the claim that older refrigerators incur higher annual repair costs. State Ho and Ha and test. Find the P-value.
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