10.18 A large retail lawn care dealer currently provides a 2-year warranty on all lawn mowerssold at its stores. A new employee suggested that the dealer could save money by just not offeringthe warranty. To evaluate this suggestion, the dealer randomly decides whether or not to offerthe warranty to the next 50 customers who enter the store and express an interest in purchasinga lawnmower. Out of the 25 customers offered the warranty, 10 purchased a mower as comparedto 4 of 25 not offered the warranty.a. Place a 95% confidence interval on π,-T2, the difference in the proportions ofcustomers purchasing lawnmowers with and without the warranty.b. Test the research hypothesis that offering the warranty will increase the propor-tion of customers who will purchase a mower. Use α-,05.

a.Confidence Interval:The form of the confidence interval is,CI = Point estimate ± Margin of…

Answered: 10.18 A large retail lawn care dealer…

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 research, 55% of millennials (those born between 1981 and 1997) reported using a library or bookmobile within the last year. Suppose that a random sample of 200 millennials is taken. Complete parts a and b below. Since 195 is a. Complete this sentence: We would expect We would expect 110 of the sample to have used a library or bookmobile within the last year, give or take (Round to the nearest integer as needed.) b. Would it be surprising to find that 195 of the sample have used a library or bookmobile within the last year? Why or why not? be surprising. ▼than 2 of the sample to have used a library or bookmobile within the last year, give or take 1. from the it
A large retail lawn care dealer currently provides a 2-year warranty on all lawn mowers sold at its stores. A new employee suggested that the dealer could save money by just not offering the warranty. To evaluate this suggestion, the dealer randomly decides whether or not to offer the warranty to the next 50 customers who enter the store and express an interest in purchasing a lawnmower. Out of the 25 customers offered the warranty, 10 purchased a mower as compared to 4 of 25 not offered the warranty. a. Place a 95% confidence interval on 7₁ - 72, the difference in the proportions of customers purchasing lawnmowers with and without the warranty. b. Test the research hypothesis that offering the warranty will increase the propor- tion of customers who will purchase a mower. Use a = .05. c. Are the conditions for using a large-sample test to answer the question in part (b) satisfied? If not, apply an exact procedure,
Update A certain company offers in-home cral HIV testing. According to their website, out of 4,998 persons who were unaware of their HIV status, 96 persons were HIV positive and 4,902 were HIV negative (as determine by an indeperdent lab test). For 4,901 out of the 4902 persons who were HIV negative, he company's test correctly predicted such a negative result, but incorrectly predicted a positive result for the one remaining person. Of the 96 persons were HIV positive, the company's test correctly predicted a positive result for 90 of them and a negative result for the others. These results can be summarized in the table below Pos Neg Total HIV 90 6 96 No HIV 4,901 4,902 Total 91 4,907 4,998 Find the estimated sensitivity of the company's test for the population that the sample of 4,998 represents. (Round to four decimal places as needed.)
10.5) Assume a pond contains 90 fish: 70 orange, 19 silver, and 1 red. A contestant pays $0.55 to randomly catch one fish and receives $0.35 if the fish is orange, $1.15 if the fish is silver, and $15.00 if the fish is red. How much (on average) does the carnival gain on each play? (If the carnival looses money, enter a negative dollar amount)
250 adults are practicing every day before taking part in a high-stakes children's game. The game requires them carefully to remove a shape- either a star or an umbrella-from a sugar wafer. 30% of those who choose stars on a given day will switch to umbrellas the next day, and 20% of those who choose umbrellas on a given day will switch to stars the next day. (a) If 150 contestants practice with stars today, how many will practice with umbrellas tomorrow? (b) If the actual game is held a long time from now, what proportion of contestants do we expect will be practicing with stars each day close to then?
The records of a computer retail store show that out of the 100customers who purchased a desktop computer last month, 73 also purchased a service plan that extends the warranty for an extra year. Out of the 25customers who purchased a notebook computer last month, 22 purchased the same service plan. Fill in the blanks below to make the most reasonable statement possible.
In a US presidential election, the incumbent president wins with 51.5% of the vote to 48.2% for the primary challenger (and .3% to others). In a nationwide telephone poll of 1000 people conducted exactly one week before the election by a university polling group, 49% of people polled supported the incumbent president, 50% supported the challenger, and 1% supported other candidates. a. For the polling study, what was the population of interest? b. What was the sample? c. Why did the sample results differ from the population? d. What are two constants that might have limited the generalizability of the polling results?
Suppose 25% of workers in a market are willing to work for $55.000 and 75% of workers are willing to work for $63,000. The expected benetit of searching (interviewing) another worker equals S
Suppose that there is a proposal on campus involving the bus schedule, in which students were asked aboutwhether they wanted Saturday bus service and/or late-night bus service. 50% favored Saturday service,57% favored late-night service and 30% favored both. How many favored neither?
The utility company in the city of Harperville serves 20,000 residential addresses. The company wants to gauge interest in a “Beat the Peak” program which offers consumers a discount in exchange for limited electricity usage during peak hours. Unknown to the utility company, 18% of its 20,000 residential customers would participate in such a program. Since the company does not know the level of interest among its customers, the company selects every 40th account from an alphabetical listing of residential account holders, starting with the 23rd name. Of the 500 subscribers selected, 16% express interest in the “Beat the Peak” program. The company also gathered other information from the 500 sampled accounts: number of people living in household __________ ["", ""] , __________ ["", "", "", ""] most frequently watched cable channel __________ ["", ""] , __________…
Use the following prompt to complete the subquestions 1.a, 1.b, and 1.c
A recent survey of college freshman asked if they had been to a movie or eaten at a restaurant during the past week. 816 responded. The following information was obtained: 266 had been to a movie, 337 had been to a restaurant and 387 had not been to a movie nor gone to a restaurant. How many of the college freshman that responded went to a movie or ate at a restaurant in the past week? Ⓒ 429 816 213 387

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