A researcher was interested in comparing the response times of two different cab companies. Companies A and B were each called at 30 randomly selected times. The calls to company A were made independentiy of the calls to company B. The response times were recorded and the summary statistics were as follows: Company A Company B Mean response time 7.6 mins 6.9 mins Standard deviation 32 mins 1.4 mins Use Table A-3 to find the critical value, t, to test, at a = 1%, the claim that the mean response time for company A differs from the mean response time for company B. Round your answer to three decimal places. Answer: A researcher was interested in comparing the resting pulse rates of people who exercise regulariy and the pulse rates of those who do not exercise regularly.

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