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An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean out-of-pocket patient billing above the reimbursed amount was $275.66 with a standard deviation of $78.11. (a) At the 5 percent level of significance, does this sample prove a violation of the guideline that the average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule. (b) Is this a close decision?
Using the .02 level of significance, conduct a five-step hypothesis testing procedure to determine if the new processes significantly reduced the wait time.
What is an appropriate null hypothesis to compare the quality of the product manufactured in the overseas plants and the U.S. plants? Why?
Find ten consecutive composite numbers. Find the prime factors of 1147 and of 1716. Are there any common factors?
Your specific assignment for this week is to choose a type of quantitative data to gather from your own life. How many minutes does it take yo to get to work everyday.
Make a relative frequency histogram by using ten-point intervals to show the distribution of the scores.
Draw the scatter diagram. Does it appear that x and y are related? If so, how? Test to determine whether there is evidence of a linear relationship.
Using hypergeometric distribution, determine the probability that the sample of 6 will comprise 2 nonconforming watches?
Given that x is a normal variable with mean u = 47 and standard deviation = 6.2, find:
With your start time being random and uniformly distributed in this interval. What is the PDF of the time that you have to wait for the first train to arrive?
For a standard normal distribution, findout the percentage of data that are among 3 standard deviation below the mean also1 standard deviation above the mean.
A researcher wished to estimate the number of households with two cars. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 4%.
What is an independent sample? What is a related sample? When should researchers use different hypothesis tests for independent and related samples?
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