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The manager of the claims department of a medical scheme can motivate to employ additional staff if she can show that the average number of claims being received for processing per day is more than 180. To motivate her need for additional staff, the manager selected a random sample of 100 days over the past year and recorded the number of claims received on each of these days.
(a) Use the Histogram option in Data Analysis to check the assumption of normality. Does the data appear to be normally distributed? Comment.
(b) Does the claims manager have good statistical evidence to support her request for additional staff? Conduct a hypothesis test for a single mean at the 1% level of significance. Show the null and alternative hypothesis and make a recommendation to the claims manager.
a recent report by the american medical association stated the average annual salary of psychiatrists is 189121 with a
What is an appropriate sample space for this experiment?
Store A has signed a revenue-sharing contract with a movie studio for DVDs. Each DVD costs the studio $2 to produce, and will be sold to Store A for $5. Store A in turn prices a DVD at $15 and forecasts demand to be normally distributed with mean 5,0..
It was reported that 20 readers responded and 87% said "no" whiles 13% said "yes". Identify four major flaws of the situation. Explain why you chose them.
Estimate the percent that did not have any dental expense. What was the cost for the 10 percent of employees who incurred the highest dental expense?
How should she proceed? What additional data (if any) is needed? Which statistical analysis technique should be used? Can an analysis be performed? Why or why not?
an airline believing that 7 of passengers fail to show for flights overbooks sells more tickets than there are seats.
Consider two urns with the following composition: Urn 1 contains 5 red and 15 black balls, Urn 2 contains 8 red and 12 black balls.
In chi-square goodness-of-fit test when there is close agreement between observed frequency and expected frequency, chi-square test value will be small.
Determine whether and how each of the following factors would shift the demand curve for chiropractic visits:
Five students took a math test before and after tutoring. Their scores were as follows. Using a 0.01 level of significance, test the claim that the tutoring has an effect on the math scores.
What is the approximate distribution of the mean NOX emission level x for these cars? (b) What is the level L such that the probability that x is greater than L is only 0.01?
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