An instructor of a speed-reading course claims that students can increase their reading speed. We test this using a group of n = 9 volunteers. We give them equal-length passages to read both before and after the speed-reading course and measure the number of seconds taken to read each passage. The data are below. Go through the steps and test the research hypothesis that subjects are faster after the course (set alpha = .05). %3D Subject Before After ID 001 87 85 002 84 82 003 75 71 004 89 78 005 97 91 006 92 91 007 88 89 008 67 71

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Clocking the Cheetah. The cheetah (Acinonyx jubatus)isthe fastest land mammal and is highly specialized to run down prey. The cheetah often exceeds speeds of 60 mph and, according to the online document “Cheetah Conservation in Southern Africa” (Trade&Envi-ronment Database (TED) Case Studies, Vol. 8, No. 2) by J. Urbaniak, the cheetah is capable of speeds up to 72 mph. The WeissStats site contains the top speeds, in miles per hour, for a sample of 35 chee-tahs. Use the technology of your choice to do the following tasks. a. Find a 95% confidence interval for the mean top speed, μ,ofall cheetahs. Assume that the population standard deviation of top speeds is 3.2 mph. d. Comment on the advisability of using the z-interval procedure on these data.

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