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 expected frequencies for all mode of payment will be:O a) 205, 120, 130 and 45O b) 120, 130, 115 and 45O c) 205. 102, 130 and 40O d) 130, 205, 45 and 115

To find: The expected frequencies for all payment mode.

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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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 = 4263.0 (Round to one decimal place as needed.) (b) Find the sample standard deviation. s = 260.0 (Round to one decimal place as needed.) (c) Construct a 90% confidence interval for the population mean μ. A 90% confidence interval for the population mean is (Round to one decimal place as needed.)
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
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