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Can people really identify their favorite brand of cola? Volunteers tasted Coca-Cola Classic, Pepsi, Diet Coke, and Diet Pepsi, with the results shown below. Research question: At a = .05, is the correctness of the prediction different for the two types of cola drinkers? Could you identify your favorite brand in this kind of test? Since it is a 2 x 2 table, try also a two-tailed two-sample z test for p1 = p2 (see Chapter 10) and verify that z2 is the same as your chi-square statistic. Which test do you prefer? Why? (Data are from Consumer Reports 56, no. 8 [August 1991], p. 519.) Cola
Correct? Regular Cola Diet Cola Row Total
Yes, got it right 7 7 14
No, got it wrong 12 20 32
Col Total 19 27 46
It is believed that the range of hourly wages paid to auto mechanics in a large city is $9 (range approx. = 4sigma-squared). If we assume that hourly wages are approximately normally distributed,
10 people taste wine A and wine B, X= denote the number prefer A. Assume that all others prefer B. These people random sample..
Find the probability that exactly 8 out of the 10 consumers recognize the brand name. Also find the probability that the number who recognize the brand name is not 8.
Calculate a four-quarter weighted moving average for the number of America Online (AOL) subscribers for the nine quarters of data. The data are reported in thousands.
She then uses the mean and standard deviation of these values to estimate the mean value for all parts the operator is making. Construct a 95% confidence interval for the mean value assuming a normal distribution.
The number of smokers among 120 randomly selected students will vary from group to group. Explain why that number can be described wit a normal model.
Find the probability that fewer than 7 are satisfied. c) Find the probability that 8 or more are satisfied. d) Find the probability that between 4 and 7 are satisfied with the airline.
For every additional hour spent studying for the exam you would expect a grade improvement of 60.2 points
The cost of gasoline will decrease or stay the same over the next 30 days because of summer holiday travel. What is your alternative hypothesis statement?
What is the probability that a consumer buys a can whose contents are actually less than the stated weight of 16 oz.?
Suppose that you roll 2 dice and consider the sum of the two. Let A be the event of throwing odd, B be the event of throwing 4 or less and C be the event of throwing a multiple of 3.a) What is the sample space S and the corresponding probability of e..
What was the cost for the 10 percent of employees who incurred the highest dental expense?
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