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Quality Progress, February 2005, reports on improvements in customer satisfaction and loyalty made by Bank of America. A key measure of customer satisfaction is the response (on a scale from 1 to 10) to the question: "Considering all the business you do with Bank of America, what is your overall satisfaction with Bank of America?" Here, a response of 9 or 10 represents "customer delight."
Historically, the percentage of Bank of America customers expressing customer delight has been 48%. Suppose that we wish to use the results of a survey of 350 Bank of America customers to justify the claim that more than 48% of all current Bank of America customers would express customer delight. The survey finds that 189 of 350 randomly selected Bank of America customers express customer delight. If, for the sake of argument, we assume that the proportion of customer delight is p = .48, calculate the probability of observing a sample proportion greater than or equal to 189/350 = .54. That is, calculate P is greater or equal to.54
Using the 0.05 level of significance, is there evidence that the population mean is above $170?
The following are quality control data for a manufacturing process at Kensport Chemical Company. The data show the temperature in degrees centigrade at five point in time during a manufacturing cycle.
Derive the probability distribution of the completion times - For each of the distribution in (i) above, calculate their relevant statistics. A task is known to have the following time to completion
Determine the strength of the causal relationship between monthly sales and new home construction by using correlation.
Regression and Correlation are two of the most often used and abused tools in research. People are quick to jump to conclusions that if a relationship exists between two variables, then one must cause (causation) the other.
Using the levels of significance given below: What is the rejection point at α = .10 and indicate if you would accept or reject H o ? t .10 =
What would be the critical value under the null hypothesis if the size of your test were 5%?
How would you find the normal approximation to the binomial probability P(x = 5) in part A? Please show how you would calculate µ and σ in the formula for the normal approximation to the binomial, and show the final formula you would use without g..
The following show the hours of sleep on weeknights for a sample of individuals age 49 and younger and for a sample of individuals age 50 and older.
Establish a 99% Confidence interval about the difference in the proportion of the town voters and county voters who favor the proposal.
This distribution is positively skewed. The standard deviation of the population is not known.
Mattel Corporation produces a remote-controlled car that requires three AA batteries. The mean life of these batteries in this product is 35 hours with a standard deviation of 5.5 hours. As part of its testing program Sony tests samples of 16 batt..
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