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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?
Obtain a test statistic and p -value assuming equal variances. Interpret these results.
Construct the 90% and 95% interval estimates for the population mean weekly sales.
In a normal frequency distribution, 32% of the cases:
Determine the probability of choosing the area code at random which ends in the odd number if first digit cannot be 1 or 0?
What is the null and alternative hypothesis? What is your final conclusion?
The 99% confidence interval estimate for a population variance when a sample standard deviation of 12 is obtained from a sample of 10 items is:
Evaluate z statistic for the Wilcoxon rank sum test, standard deviation for the Wilcoxon rank sum test and P-value for the Wilcoxon rank sum test
A restaurant monitors its customer's complaints, With information, which of the following is a Pareto chart of the data?
To test whether there is a significant mean difference among the three.
prevent coronary artery vasoconstriction and the attendant reduction in blood flow to the heart and mechanical function.
A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
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