A company has developed a new engine whose average lifetime is unknown. In order to estimate this average, 100 engines are randomly selected from a large production line and tested; their average lifetime is found to be 11 years. The 11 years represents a:
a. parameter. c. sample.
b. statistic. d. population.
Question 2
If the coefficient of correlation is .4, the percentage of variation in the dependent variable explained by the estimated regression equation _____.
a. is 40
b. is 16
c. is 4
d. can be any positive value
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