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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?
How many departments would they need to survey to achieve this level of accuracy with 95% confidence?
Find the probability of a Type II error if in fact the mean waiting time is actually 9.8 minutes.
Determine whether the difference in proportions is significant at the 0.05 level.
The instructor wanted to "pass" anyone who scored above 69. What proportion of exams will have passing scores?
What is the probability that a soldier is a female?
The event "the price of stock X has increased and the price of stock Y has not increased" may be written as??
In the history class the mean score was 76 with standard deviation 3.
Estimating confidence interval for mean value of y and find a 95% confidence interval for the expected average total sleep time for a child of age 12
Test the hypothesis that there is no difference in the mean scores of Exam 1 and Exam 2 against the alternative that the average is greater for the second exam.
Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times?
What is the maximum error of estimate for p ?
The standard deviation in cash bonuses is $15,618 and the standard deviation in annual pay is $28,077. The estimated slope of best fitting line relating x and y is?
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