Answer needed urgent An online retailer would like to study the repurchase intention of theirCustomers. The shop has then surveyed its selected customers. The results haveshown that 49 out of 100 of the surveyed customers showed their intention ofonline repurchasing the products of the shop.a) Construct a 95% confidence interval to estimate the populationproportion of customers who has an online repurchase intention towardsthe products of the shop.b) At a 0.01 significance level, is there any evidence that less than 55% of allthe customers will have online repurchase intention towards the productsof the shop?

Answered: Image /qna-images/answer/91225777-b812-4a97-b8ee-253460cb714e.jpg

Answered: An online retailer would like to study…

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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according to the university of nevada center for logistics Management, 6% of all merchandise sold in the united States gets returned. a Houston department store sampled 80items sold in January and found that 12 of the items were returned.a. construct a point estimate of the proportion of items returned for the population ofsales transactions at the Houston store.b. construct a 95% confidence interval for the proportion of returns at the Houston store
according to the university of nevada center for logistics Management, 6% of all merchandise sold in the united States gets returned. a Houston department store sampled 80items sold in January and found that 12 of the items were returned.a. construct a point estimate of the proportion of items returned for the population ofsales transactions at the Houston store.b. construct a 95% confidence interval for the proportion of returns at the Houston store.c. is the proportion of returns at the Houston store significantly different from the returnsfor the nation as a whole? Provide statistical support for your answer
Find the minimum sample size required to construct a 95% confidence interval estimate for the proportion of consumers who intend to purchase a new mobile phone in the next year if the required margin of error is 3.5%
A bank report looks at what strategies and measures financial institutions are pursuing to provide mobile financial services to their customers. In a response to a survey question about barriers hindering greater consumer adoption of mobilebanking, in a survey of 126 financial institutions, 85 said security concerns are a barrier, 78 said lack of trust in the technology is a barrier, and 13 said difficulty of use was a barrier. Construct a 90% confidence interval estimate of the population proportion of financial institutions who said that security concerns are a barrier hindering greater consumer adoption of mobile banking. _______ ≤π≤ ___________ (Round to three decimal places as needed.)
The financial manager of a large department store selected a random sample of 200 of its creditcard customers and found that 136 had incurred interest charges during the previous yearbecause of an unpaid balance.a) Give the value of the point estimate for the true proportion of credit card customers whoincurred an interest charge during the previous year. (1)b) Compute a 90% confidence interval for the true proportion of credit card customers whoincurred an interest charge during the previous year and interpret your answer. (5)c) If the desired width of the 90% interval is 0.05, what sample size is necessary to ensurethis? (4)d) Does the upper limit of the interval in part b) specify a 90% upper confidence bound for theproportion being estimated? Explain.
1) A Gallup poll of 1015 randomly selected adults found that 69% would oppose a law that limited the size of soft drinks and other sugary beverages served in restaurants. Calculate and interpret a 95% confidence interval for the proportion of all adults that would oppose a law limiting the size of soft drinks.
According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft, 23% of all complaints in 2007 were for identity theft ('Consumer fraud and,' 2008). Assume a state had 373 complaints of identity theft out of 1460 consumer complaints . Calculate a 91% confidence interval for the proportion of all complaints that are complaints of identity theft in that state.
A college claims that 25% of its students receive tuition discounts. In a sample of 150 students, 35 of the students receive tuition discounts. Using a significance level of α=0.1, perform a two-tailed hypothesis test to determine if the college’s claim is being met. Use the confidence interval approach.
A study showed that 14 of 180 publicly traded business services companies failed a test forcompliance with Sarbanes-Oxley requirements for financial records and fraud protection.Assuming that these are a random sample of all publicly traded companies, construct a 90percent confidence interval for the overall noncompliance proportion.
A recent study among 150 street hawkers in Cape Town showed that 48 of them are of the opinion that the local regulations obstruct their business. a) Construct and interpret a 95% confidence interval based on this sample.
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The production manager in an automobile plant is concerned with the number of cars that do not pass the final quality control inspection. In the last two hours he noted that in a sample of 120 cars only 92 were acceptable. The lower and upper limit of a 95% confidence interval for the true percentage of all cars that would not pass the final quality control inspection would be:

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