Software Upgrade A software company is trying to decide whether to produce an upgrade of one ofits programs. Customers would have to pay $100 for the upgrade. For the upgrade to be profitable,the company must sell it to more than 20% of their customers. You contact a random sample of 60customers and find that 16 would be willing to pay $100 for the upgrade. Do the sample data giveconvincing evidence that more than 20% of the company's customers are willing to purchase theupgrade? Carry out an appropriate test at the a=0.05 significance level. Which would be a moreserious mistake in this setting-a Type I error or a Type II error?

Random sample of=60 The company must sell its upgrade to more than 20% of their customers level of…

Answered: Software Upgrade A software company is…

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 Many students over the last couple of years have been earning money as social networking service influencers. The amount of influencers and their popularity has been growing steadily. The top 50 social networking service influencers have over 3 billion followers together. Unfortunately, this development has a downside for dogs. According to a recent newspaper article, dogs deemed less playful for video sharing social networking services are being dumped at shelters. The general perception of playfulness disproportionately affects older dogs. The accompanying table gives the data for a random selection of dogs from a local shelter for a correlation of age and days. Construct a 90% confidence interval to estimate the average number of days a dog that is 4 years old will stay at the shelter. Click the icon to view the data table. (CCECOP) Determine the upper and lower limits of the 90% confidence interval. UCL= days LCL = days (Round to two decimal places as needed.)
The Motion Picture Association claims that an average American sees 3.9 movies at the theater each year. A curious student randomly selects a sample of 30 students from their school and finds that people in the sample have seen an average of 4.5 movies with a standard deviation of 1.2 movies. Does this sample provide evidence that people are attending the movies more often? Provide a complete significance test using `\alpha` = 0.01 to support your answer.
Exit polling is a popular technique used to determine the outcome of an election prior to results being tallied. Suppose a referendum to increase funding for education is on the ballot in a large town (voting population over 100,000). An exit poll of 500 voters finds that 245 voted for the referendum. How likely are the results of your sample if the population proportion of voters in the town in favor of the referendum is 0.51? Based on your result, comment on the dangers of using exit polling to call elections. Question content area bottom Part 1 How likely are the results of your sample if the population proportion of voters in the town in favor of the referendum is 0.51?
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Cable TV choices: A telecommunications company provided its cable TV subscribers with free access to a new sports channel for a period of one month. It then chose a sample of 415 television viewers and asked them whether they would be willing to pay an extra $10 per month to continue to access the channel. A total of 25 of the 415 replied that they would be willing to pay. The marketing director of the company claims that less than 10% of all its subscribers would continue subscribing. Can you conclude that the director's claim is true? Use the α = 0.01 level of significance with the P-value method and Excel.
Job Satisfaction. A study reported in the Journal of Small Business Management concluded that selfemployed individuals do not experience higher job satisfaction than individuals who are not selfemployed. In this study, job satisfaction is measured using 18 items, each of which is rated using a Likerttype scale with 1–5 response options ranging from strong agreement to strong disagreement. A higher score on this scale indicates a higher degree of job satisfaction. The sum of the ratings for the 18 items, ranging from 18 to 90, is used as the measure of job satisfaction. Suppose that this approach was used to measure the job satisfaction for lawyers, physical therapists, cabinetmakers, and systems analysts. The results obtained for a sample of 10 individuals from each profession follow. SatisJob Lawyer Physical Therapist Cabinetmaker Systems Analyst 44 55 54 44 42…
Practice question #3 Investigators want to know if those who work long hours have more trouble sleeping. In one sample of 190 British civil servants who worked more than 40 hours a week, 95 of them said they usually get less than 7 hours of sleep per night. In a second sample of 150 British civil servants who worked between 35 and 40 hours per week, 63 of them said they usually get less than 7 hours of sleep per night. The investigators believe these are represent samples of the populations. Find a 95% Confidence Interval for the difference in proportions of these two populations that get less than 7 hours of sleep per night. Then interpret the confidence interval. Be sure to check that any necessary conditions are met first. Round final answers to 3 decimal places. Verify conditions are appropriate for method: Interval: ________________________ Does the interval contain zero? __________ What does this information lead you to conclude?
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A retailer is looking to evaluate its customer service. Management has determined that if the retailer wants to stay competitive, then it will have to have at least a 91% satisfaction rate among its customers. Management will take corrective actions if the satisfaction rate falls below 91%. They conduct a survey to determine if the satisfaction rate is lower than 91%. A survey of 1,450 customers showed that 1,305 were satisfied with their customer service. (a) Give the test statistic. (Round to two decimal places.) (b) Give the p-value (Round to three decimal places.) (c) State whether or not the management should take corrective action, based on a 5% significance level. Explain briefly.
Determining whether two samples are independent or paired a... Charmaine has two ways to travel from her home in Norco to her office in Los Angeles. One is to go via the San Bernardino Freeway, and the other is to go via the Pomona Freeway. Recently, a lane was added to the San Bernardino Freeway. So, Charmaine wants to determine if it is now faster to take the San Bernardino Freeway than the Pomona Freeway. She selected a random sample of 12 of her trips via the San Bernardino Freeway and a random sample of 12 of her trips via the Pomona Freeway. The two samples were chosen separately, so that the selection of the trips via the San Bernardino Freeway did not affect the selection of the trips via the Pomona Freeway. Charmaine recorded the travel times (in minutes) for the trips in each of the two samples. The following table gives the data, sample means, and sample standard deviations. S.B. Fwy 79, 76, 66, 69, 71, 75, 67, 75, 65, 60, 76, 74 Pomona Fwy 63, 76, 79, 78, 74, 71, 65, 75,…
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