math215 Lecture Notes - Lecture 5: Wisdom Tooth, Criminology, Contingency Table
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Unit 5 estimation and tests of hypotheses for two or more populations. In a random sample of 2200 males, 1628 males indicated that they exercise regularly every week. Keep your work to four decimal places: a large fast-food chain has a quality standard for the standard deviation of the waiting times of its customers. The waiting time refers to the period between the time that the customer first stands in line and the time the customer gets his or her meal. The quality standard is that the standard deviation of population waiting times is at most one minute. The waiting times, in minutes, experienced by a sample of six randomly selected customers of the fast-food chain are listed below. 4. 5, 8, 6, 6. 5, 7, 5: compute the sample standard deviation of the waiting times. Keep all of your work to four decimal places: construct a 99% confidence interval for the population variance and standard deviation of waiting times.
