An audltor revlewed 25 oral surgery Insurance clalms from a particular surgical office, determining that the mean out-of-pocket patlentbilling above the relmbursed amount was $280.11 with a standard devlation of $77.78.At the 5 percent level of significance, does this sample prove a vlolation of the guldellne that the average patlent should pay no morethan $250 out-of-pocket?(a-1) Hi u s $250 versus H,: u> $250. Choose the right option.a. Reject Hg if tals <1.711b. Reject Hg If tale > 1.711a(a-2) Calculate the test statistic. (Round your answer to 2 decimal places.)Test statistic(a-3) The null hypothesis should be rejected.TrueO False(a-4) The evidence does show that the average out-of-pocket expense is greater than $250.O TrueO False(b) Is this a close decislon?O YesO No

Answered: Image /qna-images/answer/f2edb2c0-f633-4d0d-b90b-7dd5e70c85c9.jpg

Answered: An auditor revlewed 25 oral surgery…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of 100 minutes and a standard deviation of 10 minutes. What proportion of 1040R tax forms will be completed in at least 111 minutes? Round your answer to at least four decimal places.
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The original data set is in the picture and the question parts needs to be answered as well for the original data set. Read and answer carefully and correctly. Compute the mean, median, and mode for the data. Show your complete work. (b) Compute a 5% trimmed mean for the data, and compare it with the mean computed in part (a). Does the trimmed mean more accurately reflect the general level of the daily rental costs? If 5 will be added to each cost of condominiums, what will be the mean, median and mode? If each cost of condominium will be added by 10 and multiplied by 2, what will be the mean, median and mode?
USA TODAY (October 14, 2016) reported that Americans spend 4.1 hours per weekday checking work email. This was an estimate based on a survey of 1,004 white-collar workers in the United States. (a) Suppose that you would like to know if there is evidence that the mean time spent checking work email for white-collar workers in the United States is more than half of the 8-hourwork day. What would you need to assume about the sample in order to use the given sample data to answer this question? (Select all that apply.) We would need to assume that all white-collar workers were surveyed or the sample is representative of the population of white-collar workers in the United States.We would need to assume that all observations are dependent or all observations are independent.We would need to assume that the distribution of the population of times is normal or that the sample size is small.We would need to assume that the sample was randomly selected or is representative of the population…
Please see below for the question details. I got 34.32 for the interest, but I also got 19.68 and 32 when I reworked the problem; Please help!!!! Because of the relatively high interest rates, most consumers attempt to pay off their credit card bills promptly. However, this is not always possible. An analysis of the amount of interest paid monthly by a bank's Visa cardholders reveals that the amount is normally distributed with a mean of 27 dollars and a standard deviation of 8 dollars.Please use z-scores with at least 3 decimal places. D. What interest payment is exceeded by only 18% of the bank's Visa cardholders? Interest Payment =
An auditor, examining a total of 820 accounts receivable of a corporation, took a random sample of 90 of them. The sample mean was $126.99, and the sample standard deviation was $44.21. Complete parts a through e. a. Using an unbiased estimation procedure, find an estimate of the population mean. An estimate of the population mean is $126.99. (Round to the nearest cent as needed.) b. Using an unbiased estimation procedure, find an estimate of the variance of the sample mean. An estimate of the variance of the sample mean is 19.357. (Round to three decimal places as needed.) c. Find a 90% confidence interval for the population mean. $119.68 <<$ 134.30 (Round to the nearest cent as needed.) d. A statistician found, for the population mean, a confidence interval running from $116.99 to $136.99. What is the probability content of this interval? The probability content is (Round to four decimal places as needed.)
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Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of 100 minutes and a standard deviation of 20 minutes. What proportion of 1040R tax forms will be completed in at least 105 minutes? Round your answer to at least four decimal places.
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