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CRA CDs, Inc., wants the mean lengths of the "cuts" on a CD to be 135 seconds (2 minutes and 15 seconds). This will allow the disk jockeys to have plenty of time for commercials within each 10-minute segment. Assume the distribution of the length of the cuts follows the normal distribution with a population standard deviation of 8 seconds. Suppose we select a sample of 16 cuts from various CDs sold by CRA CDs, Inc.
a. What can we say about the shape of the distribution of the sample mean?b. What is the standard error of the mean?c. What percent of the sample means will be greater than 140 seconds?d. What percent of the sample means will be greater than 128 seconds?e. What percent of the sample means will be greater than 128 seconds but less than 140 seconds?
What is the probability that an employee selected at random will need either corrective shoes or major dental work?
A student has determined it takes an average of 16 minutes to drive from home, park the car, and get to class with a deviation of 4 so if it took the student 25 minutes what will the standard deviation be?
On average, you receive 2 telemarketing calls per day. What is the probability that you will not receive any telemarketing calls today.
Do these scores suggest that the different foods are differentially preferred by people in general? (Use the .05 significance level.)
The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean for a sample of n = 100 is 2 points. Explain the difference in the standard error??
The Gallup organization conducted a telephone survey with a random selected national sample of 1005 adults, 18 years and older. The survey asked the respondents, "How would you describe your own physical health at this time? "Response categories w..
What is the 95% confidence interval for the proportion of all delinquent customer accounts at this manufacturing company?
Do these data provide suffiient evidence to establish that the site is acceptable? Use = 0:05. What are the consequences of Type I and Type II errors? Which error is more expensive to make?
The speed limit on Interstate 75 around Findlay, Ohio, is 65 mph. On a clear day with no construction, the mean speed of automobiles was measured at 63 mph with a standard deviation of 8 mph.
Does the evidence suggest that postpartum women do not get enough sleep? Use =0.05 level of significance. How is the problem set up using the classical and P-value approach.
a) Draw the scatter diagram. Does it appear that x and y are related? If so, how? b) Test to determine whether there is evidence of a linear relationship.
Write down the name of 4 parts of the regression equation.
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