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Using a driving simulator, a human factors psychologist measured the time to press the brake pedal after a visual alert for younger and older drivers. The mean reaction time for a sample of 20 younger drivers was 2.8 sec with a standard deviation of .3 sec, and 3.2 sec for a sample of 18 older drivers with a standard deviation of .4. Compute a 95% confidence interval for the difference between the population means for the two groups using the t-distribution. What is the lower limit?
a.0.715b.0.085c.0.165
Using a driving simulator, a human factors psychologist measured the time to press the brake pedal after a visual alert for younger and older drivers. The mean reaction time for a sample of 20 younger drivers was 2.8 sec with a standard deviation of .3 sec, and 3.2 sec for a sample of 18 older drivers with a standard deviation of .4. Compute a 99% confidence interval for the difference between the population means for the two groups using the t-distribution. What is the lower limit?
a.0.165b.0.635c.0.085
A clinical psychologist administered the Beck Depression Inventory to a random sample of 100 UNM undergraduates. Using her data, she determined that there was a 90% likelihood that the true mean score of the students would fall between scores of 13 and 19. What had she calculated?
a.point estimate of the sample mean
b.confidence interval for the mean
c.confidence interval for the difference between means
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