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CRA, CD's, Inc wants the mean lengths of the "cuts" on a CD be 135 seconds. This will allow the disk jockeys to have plenty of time for commercials within each 10 minite segment. Assume the distribution of the length of the cuts follows a normal distribution with a standard deviation of 8 seconds. Suppose we select a sample of 16 cuts from various CDs sold by CRA CD's Inc. What can we say about the shape of the distribution of the sample mean?
1- 67% of the sample means will be b/w 127 seconds and 143 seconds
2- 95% of the sample means will be b/w 127 seconds and 143 seconds
3- 99% of the sample means will be b/w 127 seconds and 143 seconds
4- 100% of the sample means will be b/w 127 seconds and 143 seconds
When the null hypothesis is rejected in the goodness-of-fit test, it means there is close agreement between the observed and expected frequencies.
Find a 95% confidence interval for the population mean selling price of all homes in this neighborhood.
Give an example of a hypothesis test. State what the Null and the Alternative hypotheses.
The quality control department of Widgets Manufacturing needs your help. They can't decide which significance level is appropriate for testing the claim that fewer than 50% of widgets from a production run are defective.
In looking at your business, when and why would you want to use a one-sample mean test (either z or t) or a two-sample t-test? Create a null and alternate hypothesis for one of these issues. How would you use the results?
What size sample would be required to estimate the proportion of hospital referrals with a margin of error of 0.04 or less at 95% confidence?
Following data represent random sample of bank balances for population of checking account customers at large eastern bank. Based on data, determine the 95 percent confidence interval estimate for true population mean?
The events are defined as follows: Let A be the event that the player selected has a number from 1 to 8. Let B be the event that the player selected is a guard. Let C be the event that the player selected is a forward. Let D be the event that the pla..
He reviews the last eight months at dealership B and finds the standard deviation of the eight monthly sales to be 22.95. Using the .01 significance level does the analyst find evidence that the boast of dealership A is correct?
Would it be reasonable to conclude that the population mean is 63 pounds?
(A) What sums are needed to calculate a correlation coefficient? (B) What are the two ways of testing a correlation coefficient for significance?
Write ten-step study plan with suitable example that will permit you to analyze your data.
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