Over the past three years, Shoprite Supermarket has observed the following distribution of modes of payment in theexpress lines: Cash (C) 41%, Cheques (Ck) 24%, Credit cards (D) 26%, and other (N) 9%. In an effort to make expresscheckout more efficient, Shoprite has just begun offering a discount for cash payment in the express checkout line. Thetable below presents the distribution of modes of payment for a sample of 500 express-line customers after the discountwent into effect. Suppose you must test the hypothesis at 10% level of significance that the distribution of modes ofpayment in the express checkout line changed after the discount went into effect.Mode of paymentCashChecksCredit cardsOtherNumber of customers24010411145The test statistic will be:O a) 6.251O b) 10.886c) 120.333d) 45.667

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Answered: Over the past three years, Shoprite…

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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B3
Split the Bill? Exercise 2.153 describes a study to compare the cost of restaurant meals when people pay individually versus splitting the bill as a group. In the experiment half of the people were told they would each be responsible for individual meal costs and the other half were told the cost would be split equally among the six people at the table. The data in SplitBill includes the cost of what each person ordered (in Israeli shekels) and the payment method (Individual or Split). Some summary statistics are provided in Table 6.20 and both distributions are reasonably bell-shaped. Use this information to test (at a 5% level) if there is evidence that the mean cost is higher when people split the bill. You may have done this test using randomizations in Exercise 4.118. Table6.20Cost of meals by payment type Payment Sample size Mean Std. dev. Individual 24 37.29 12.54 Split 24 50.92 14.33
The American Association of Individual Investors (AAII) On-Line Discount Broker Survey polls members on their experiences with discount brokers. As part of the survey, members were asked to rate the quality of the speed of execution with their broker as well as provide an overall satisfaction rating for electronic trades. Possible responses (scores) were no opinion (0), unsatisfied (1), somewhat satisfied (2), satisfied (3), and very satisfied (4). For each broker summary scores were computed by calculating a weighted average of the scores provided by each respondent. Suppose a portion of the survey results follow. Brokerage Speed Satisfaction A 3.4 3.5 B 3.3 3.5 C 3.4 3.9 D 3.6 3.6 E 3.2 2.9 F 3.8 2.8 G 3.8 3.6 H 2.6 2.6 I 2.7 2.3 J 4.0 4.0 K 2.5 2.5 These ratings data on x = the quality of the speed of execution and y = overall satisfaction with electronic trades provided the estimated regression equation ŷ = 0.243 + 0.896x. At the 0.05 level of…
According to a New York Times/CBS poll, 76% agreed that it should be the government's responsibility to provide a decent standard of living for the elderly, and 35% agreed that it would be a good idea to invest part of their Social Security taxes on their own. What is the smallest percentage of people who could have agreed with both statements?
Bank of America's Consumer Spending Survey collected data on annual credit card charges in seven different categories of expenditures: transportation, groceries, dining out, household expenses, home furnishings, apparel, and entertainment (U.S. Airways Attache, December 2003). Using data from a sample of 42 credit card accounts, assume that each account was used to identify the annual credit card charges for groceries (population 1) and the annual credit card charges for dining out (population 2). Using the difference data, the sample mean difference was = $844, and the sample standard deviation was sd = $1,166. C) What is the point estimate of the difference between the population means? $ What is the 95% confidence interval estimate of the difference between the population means (to the nearest whole number)? ( need amount, need amount)
An airline offers discounted "advance purchase " fares to customers who buy tickets more than 30 days before travel and charges "regular" fares for tickets purchased during those last 30 days. The company has noticed that 60% of its customers take advantage of the advance-purchase fares. The "no-show" rate among people who paid regular fares is 30%, but only 5% of customers with advance-purchase tickets are no-shows. a) What percent of all ticket holders are no-shows? b) What 's the probability that a customer who didn't show had an advance -purchase ticket? c) Is being a no-show independent of the type of ticket a passenger holds? Explain.
Your hospital is negotiating with medical insurance providers, who would like to reduce the amount they pay as reimbursement for hospital stays. For a particular procedure, they would like to reduce payment by $300 and have patients go home one day earlier. To see what effect this would have on hospital costs, a random sample of 50 patients who were recently admitted for this procedure was analyzed. Had they left one day earlier, the average hospital cost would have been $322.44 less, and the standard deviation was found to be $21.71. Construct a 95% confidence interval for the mean net savings for the hospital, per patient, for the larger population of recent patients.
The Gays Love You Chamber of Business conducted a survey amongst 17 furniture retailers to identify the percentage of bad debts in each company’s debtors’ book.The bad debts percentages are as follows 2.2 4.7 6.3 5.8 5.7 7.2 2.6 2.4 6.1 6.8 2.2 5.7 3.4 6.6 1.8 4.4 and 5.4 (a) Calculate the skewness coefficient for percentage of bad debts. Is the data skewed?(b) Compute the first quartile and the third quartile of the percentage of bad debts amongst the furniture retailers surveyed. Interpret these quartile values.
Frq styled response
At Oriole Company, events and transactions during 2020 included the following. The tax rate for all items is 40%.(1) Depreciation for 2018 was found to be understated by $ 151000.(2) A strike by the employees of a supplier resulted in a loss of $ 125100.(3) The inventory at December 31, 2018 was overstated by $ 201000.The effect of these events and transactions on 2020 income from continuing operations net of tax would be
A hospital wants to estimate the percentage of admitted patients who receive Medicare benefits. If we want to estimate that percentage based on examination of randomly selected patient payment records, how many patient records must be examined in order to be 90% confident that we are within four percentage points of the population percentage?
The monthly incomes for 12 randomly selected people, each with a bachelor's degree in economics, are shown on the right. Complete parts (a) through (c) below. Assume the population is normally distributed. 4450.04 4596.08 4366.42 4455.64 4151.49 3727.22 4283.36 4527.36 4407.11 3946.91 4023.06 4221.57 (a) Find the sample mean. X = (Round to one decimal place as needed.)

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