In a psychological testing experiment, 25 subjects are selected randomly and their reaction time, in seconds, to a particular simulus is measured. Past experience suggests that the variance in reaction times to these types of stimuli is 4 sec^2 and that the distribution of reaction times is approximately normal. The average timw for the subjects is 6.2 seconds. Give an upper 95% bound for the mean reaction time.
Using traditional methods it takes 105.0 hours to receive a basic flying license. A new license training method using Computer Aided Instruction (CAI) has been proposed. A researcher used the technique on 100 students and observed that they had a mean of 104.0 hours. Assume the standard deviation is known to be 7.0. Is there evidence at the 0.05
level that the technique performs differently than the traditional method?
Enter the hypotheses:
F to 45
and sample standard deviation s. (Round your answers to four decimal places.)
of all summer sleeping bags. (Round your answers to two decimal places.)
