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 mobile banking, in a survey of 119 financial institutions, 78 said security concerns are a barrier, 70 said lack of trust in the technology is a barrier, and 19 said difficulty of use was a barrier. Complete parts (a) through (d) below.a. 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.\[ 0.583 \leq \pi \leq 0.727 \] (Round to three decimal places as needed.)b. Construct a 90% confidence interval estimate of the population proportion of financial institutions who said that lack of trust is a barrier hindering greater consumer adoption of mobile banking.\[ \pi \leq 0.664 \] (Round to three decimal places as needed.)

The random variable financial institutions follow normal distribution. The sample size is 119. We…

Answered: A bank report looks at what strategies…

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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36. Flights on time 2016 revisited Will your flight get you to your destination on time? The Bureau of Transportation Statis- tics reported the percentage of flights that were delayed each month from 1994 through June of 2016. Here's a histogram, along with some summary statistics: 50 n270 19.696 s 4.214 40 30 20 %23 10 10 15 20 25 30 Delayed % We can consider these data to be a representative sample of all months. There is no evidence of a time trend (r 0,07). a) Check the assumptions and conditions for inference about the mean. # of Months
3. A large automobile manufacturing plant produces 1200 new cars every day. A quality-control inspector checks a random sample of 90 cars from one day's production and finds that 12 of them have minor paint flaws. a. Find the margin of error for a 99% confidence interval. b. Construct and interpret a 99% confidence interval by completing the statement below. We are [ % confident that the true population proportion for the cars with minor paint flaws are between and c. Find the margin of error for a 90% confidence interval. d. Construct and interpret a 90% confidence interval by completing the statement below. We are % confident that the true population proportion for the cars with minor paint flaws are between and e. A 99% confidence interval is than a 90% confidence interval
An issue of Time Style and Design reported on a poll conducted by Schulman Ronca &Bucuvalas Public Affairs about the shopping habits of wealthy Americans.A total of 603 interviews were conducted among a national sample of adults with householdincomes of at least $150,000. Of the adults interviewed, 410 said they had purchased clothing,accessories, or books online in the past year.a. Find a 95% confidence interval for the proportion of all U.S. adults with householdincomes of at least $150,000 who purchased clothing, accessories, or books online inthe past year.b. Interpret the confidence interval.
Microsoft periodically issues a Security Bulletin that re-ports the software affected by the vulnerability. In a sample of 50 bulletins issued in a recent year, 32 reported a security problem with Microsoft Windows. a. Find a point estimate of the proportion of security bulletins issued that reported a problem with Windows during the year. b. Find an interval estimate for the proportion, part a. Use a 90% confidence interval. c. Practically interpret the confidence interval, part b. Your answer should begin with, "We are 90% confident .. ".
The Health Care Cost Institute tracks health care expenditures for beneficiaries under theage of 65 who are covered by employer-sponsored private health insurance (Health CareCost Institute website, November 4, 2012). The data contained in the DATAfile namedDrugCost are consistent with the institute’s findings concerning annual prescription costsper employee. Analyze the data using Excel and answer the following questions.a. Develop a 90% confidence interval for the annual cost of prescription drugs.b. Develop a 90% confidence interval for the amount of out-of-pocket expense peremployee.c. What is your point estimate of the proportion of employees who incurred no prescription drug costs?
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In a study designed to determine whether there was a cluster of brain cancer cases at a Pratt & Whitney plant, record from 223,000 employees were studied and 723 employees with brain tumors were found. Treat those employees as a random sample and construct a 95% confidence interval estimate of the proportion of all adults who develop such tumors. write a brief statement interpreting that confidence interval.
TV advertising agencies face increasing challenges in reaching audience members because viewing TV programs via digital streaming is gaining in popularity. A poll reported that 80% of 2367 American adults surveyed said they have watched digitally streamed TV programming on some type of device. a. Calculate and interpret a confidence interval at the 95% confidence level for the proportion of all adult Americans who watched streamed programming up to that point in time. )
3. The Pew Research Center has conducted extensive research on the young adult population (Pew Research website, November 6, 2012). One finding was that 93% of adults aged 18 to 29 use the Internet. Another finding was that 21% of those aged 18 to 28 are married. Assume the sample size associated with both findings is 500. a) Develop a 95% confidence interval for the proportion of adults aged 18 to 29 who use the Internet. b) Develop a 99% confidence interval for the proportion of adults aged 18 to 28 who are married. c) In which case, part (a) or part (b), is the margin of error larger? Explain why.
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