Aa random sample is needed toconstruct a 99% interval for the true average sale volume with a margin of error equal to 1?7.24. A personnel agency is comparing salaries of uncertified accountants versus CPAs. Amongrecent accountants that they placed, 4 were uncertified while 6 were CPAS. The annual salaries(in dollars) are summarized in the following table:a. Calculate a 95% confidence interval for the difference between average salaries of uncertifiedaccountants and CPAs.CHAPTER 7. CONFIDENCE INTERVALS&7b. Interpret the interval in part a.c. Is there a difference between average salaries of uncertified accountants versus CPAS?MacBook ProWUPDFJ7.25. A clothing company wanted to compare the service satisfaction of two of their retail stores.Customers were asked to rate the service they received on a scale of 1 to 10. A survey wasconducted on 150 customers visiting their NYC store, who recorded an average rating of 7.4with a standard deviation of 1.3. The similar survey was conducted on 200 customers visitingtheir Chicago store, yielding an average rating of 8.2 and a standard deviation of 1.8. DevelopK< 126/ 186 > >122%*8O0AverageSDSample SizeTable 7.6: Annual Salaries(9< ....Uncertified CPA0$48,500 $56,600$8,700 $9,10046)0PF{[+ 11121Q882023-0...20.52 PM}]delete-A*******PR

Given, a summary of annual salary in $ Average 48.50 56.60 SD 8.70 9.10 Sample size 4 6…

Answered: 7.24. A personnel agency is comparing…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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#2...Can you write out answer please n thank u
The average income of a large sample of households is $63,000 and the s.d. is $7,000. Assume that the data is approximately bell-shaped. What percent of these households have incomes between $42,000 and $77,000? Don’t forget to properly justify your answer using the empirical rule.
. In a random sample of 400 private high school students, 320 said they brought a smartphone to school that day, while in a random sample of 400 public high school students, 288 said they brought a smartphone to school that day. Which of the following represents a 98 percent confidence interval estimate for the difference (private high school minus public high school) between the proportions of all private high school and public high school students who bring a smartphone to school? (0.8)(0.2) (0.72)(0.28) (A) (0.8-0.72)±1.96, 400 400 (B) (0.8-0.72)±2.054, + (0.8)(0.2) (0.72)(0.28) 400 400 (C) (0.8-0.72)±2.326 + (0.8)(0.2) (0.72)(0.28) 400 400 1 (D) (0.8-0.72)±2.054, (0.76)(0.24) + 400 400 (E) (0.8-0.72)±2.326, (0.76)(0.24) + I 400 400
Suppose we wish to estimate the average number of hours per week that Americans watch TV. Use the following data from an SRS to find a 90% confidence interval: 30 64 49 40 21 58 9 43 39 43
Mr. James, president of Daniel-James Financial Services, believes that there is a relationship between the number of client contacts and the dollar amount of sales. To document this assertion, he gathered the following information from a sample of clients for the last month. Let X represent the number of times that the client was contacted and Y represent the valye of sales ($1000) for each client sampled. Number of Contacts (X) Sales ($1000) 14 24 12 14 20 28 16 30 23 30 b) compute the correlation coefficient and coeffcient of determination. Interpret the coefficients.
If two people used the same data and one person made a 90% confidence interval and the other person made a 95% confidence interval for p, which interval would be more narrow? is it; a. The 90% Confidence interval b. The 95% Confidence interval c. We cannot tell from the information alone.
Use the results from a survey of a simple random sample of 1064 adults. Among the 1064 respondents, 69% rated 13 themselves as above average drivers. We want to test the claim that more than 20 of adults rate themselves as above average drivers. Complete parts (a) through (e). A. No. Assuming quality of driving can be quantified, half of all adults must have driving quality less than or equal to the mean. B. Yes. Assuming quality of driving can be quantified, a distribution that is extremely skewed to the right would be the most promising scenario for more than this proportion of adults to have driving quality that is above the mean. C. Yes. Assuming quality of driving can be quantified, a distribution that is extremely skewed to the left would be the most promising scenario for more than this proportion of adults to have driving quality that is above the mean. O D. No. It is impossible to compare the quality of different adults' driving. b. If we use the same significance level to…
8.2 Question 3). According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft, Arkansas had 1,601 complaints of identity theft out of 3,482 consumer complaints ("Consumer fraud and," 2008). Calculate a 90% confidence interval for the proportion of identity theft in Arkansas.
While reading a published research report, you encounter the following statements. For each, identify the N, the procedure performed and the outcome, the relationship, and the type of error possibly being made. (a) “When we examined the perceptual skills data, the mean of 55 for the sample of adolescents differed significantly from the population mean of 70 for adults, t(45) = 3.76, p < .01.” (b) “The correlation between personality type and emotionality, however, was not significantly different from zero, with r(25) = +.42, p > .05.”
Please use the approporate stats table provided. Do not use a software for this problem. Q17: If the mean number of serious accidents per year in a large factory (where the number of employees remains constant) is five, find the probability that in the current year there will be:a. No accidents b. One accident c. Two or more

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