Refer to the table shown below. Students in an introductory statistics course we

Question

Refer to the table shown below. Students in an introductory statistics course were asked whether or not they had a dog and/or a cat as a pet. This table summarizes the results. For example, 10 out of the 100 students in the class respondent that they had a pet cat but did not have a dog. If a student who is chosen at random has a cat, what is the probability that they will also have a dog? Write your answer in decimal correct two decimal places. ______ If a student is chosen at random, what is the probability that they will have a dog or a cat? Write your answer in decimal correct two decimal places. _____ According to a U.S. Food and Drug Administration (FDA) study, a cup of coffee contains of 115 mg of caffeine, with the amount per cup ranging from 60 to 180 mg method. We can estimate the standard deviation of the population to be 1/4 of Suppose you want to repeat the FDA study to obtain an estimate of the mean to within 5 mg with 95% confidence using your favorite brewing method. How of coffee must you brew to be 95% confident? _____

Explanation / Answer

9) probabilty =12/22 =0.55

10)probabilty =(10+4+12)/100 =0.26

11)here std deviation=(180-60)/4 =30 (left part is hidden, please revert on this)

margin of error E=5

and for 95% CI, z=1.96

hence sample size n=(z*Std deviartion/E)2 =~139

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