Number Credit cards. A bank vice president fuele that each samnings gecount costumen hax, on average, Three credit cards. He jetoning distribution have represents the number & cudit carde people oran. Find the mean, variance, and standard Ideviation. Is the vice president correct? O 2 3 4 0.18 0127 0.08 0.03 ho. 9 cards x no. g Probability P(x) 0.44
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- Is it possible that P(AB)=P(A)? Explain.An engineer decides to buy four new snow tires for his car. He finds that Retailer A is offering a special cash rebate, which depends on how much snow falls during the first winter. If this snowfall is less than 50% of the mean annual snowfall for his city, his rebate will bet 50% of the list price. If the snowfall that winter is more than 50% but less than 75% of the mean annual snowfall, his rebate will be 25% of the list price. If the snowfall is more than 75% of the mean annual snowfall, he will receive no rebate. The engineer finds from a reference book that the annual snowfall for his city has a mean of 80 cm and standard deviation of 20 cm and approximates a normal distribution. The list price for the brand and size of tires he wants is $80.00 per tire. The engineer checks other retailers and finds that Retailer B sells the same brand and size of tires with the same warranty for the same list price but offers a discount of 5% of the list price regardless of snowfall that…The past records of a supermarket show that its customers spend an averageof $95 per visit at this store. Recently the management of the store initiated a promotionalcampaign according to which each customer receives points based on the total moneyspent at the store, and these points can be used to buy products at the store. Themanagement expects that as a result of this campaign, the customers should beencouraged to spend more money at the store. To check whether this is true, the managerof the store took a sample of 14 customers who visited the store. The following data givethe money (in dollars) spent by these customers at this supermarket during their visits. 109 136 107 116 101 109 110 94 101 97 104 83 67 120Assume that the money spent by all customers at this supermarket has a normaldistribution. Using a 5% significance level, can you conclude that the mean amount ofmoney spent by all customers at this supermarket after the campaign was started is morethan $95?
- O Tues, Mar 02: Independent Pra X K Sarah Loutfi - Independent Pra X M Verify your email address - srh X b My Questions | bartleby PB OCPS Dashboard web.kamihq.com/web/viewer.html?state=D%7B"ids"%3A%5B"14npUclxjbYhVGxMylY6MWKGbJBGDS-19"%5D%2C"action"%3A"open"%2C"userld"%3A"105426... 出 Apps OCPS O > Page 2 12 9:02 PM 3/4/2021 DELL ...Explain why there must be a mistake in each of thefollowing statements: (a) The probability that Jean will pass the bar examina-tion is 0.66 and the probability that she will not pass is −0.34.(b) The probability that the home team will win anupcoming football game is 0.77, the probability that it willtie the game is 0.08, and the probability that it will win ortie the game is 0.95.(c) The probabilities that a secretary will make 0, 1, 2, 3, 4,or 5 or more mistakes in typing a report are, respectively,0.12, 0.25, 0.36, 0.14, 0.09, and 0.07.(d) The probabilities that a bank will get 0, 1, 2, or 3 ormore bad checks on any given day are, respectively, 0.08,0.21, 0.29, and 0.40.1. An online seller would like to know whether the indication of price on Facebook posts will attract consumers more. He posted 50 products for sale on Facebook market, 25 of which he indicated the price while the remaining 25 products, did not have prices. Buyers were just instructed to send him a personal message (pm) if they want to know the price. He then identified which products have greater sales. What is the independent, dependent, and extraneous variable? 2. A housewife wanted to know which soil is best for her pechay plants: the soil purchased from an online seller, soil from her backyard compost or the soil underneath the nearby bamboo tree. She planted 30 pechay seeds into each soil source and then compared the growth of pechay after a month. What is the independent, dependent, and extraneous variable? 3. Jenny is only borrowing the cellphone chargers of her brother, sister and mother because she lost her phone charger. All chargers are of the same specifications as hers…
- A pet store conducted a survey to gather information about the types of pets people own. Here are the results. 624 people were surveyed in all 346 of the people own a fish 34 of the people own a cat, but own neither a fish nor a bird . . . 103 of the people own a bird, but own neither a fish nor a cat 114 of the people own a fish, but own neither a bird nor a cat .61 of the people own both a fish and a bird, but don't own a cat . 138 of the people own both a fish and a cat, but don't own a bird 575 of the people own at least one of these three types of pets (fish, bird, cat) Construct a Venn diagram illustrating these results. Then answer the question. . . All people in the survey Own a fish Own a cat 0 Own a bird. How many of the people own a bird? peopleIn Spetember of 2013, Mario The Baker introduced a new chocolate cake and hired Doug and Jeremy to bake these cakes. Every customer buying this new chocolate cake either gives it a "thumbs up" or a "thumbs down". Based on the data accumulated between 10/2013 and 9/2014, we know that 40% of the cakes baked by Doug gets a "thumbs up", while only 10% of those baked by Jeremy gets a "thumbs up". About 70% of the cakes are baked by Doug. One cake was selected at random on 10/01/2014. Find the probability that the cake got a "thumbs up".Seven percent of those who invest in mutual funds consider corporate stocks to be “very safe”, 58% consider them “relatively safe”, 24% consider them “not very safe”, 4% consider them “not safe” and 7% "They are not safe at all." Business / Week / Harris asked 550 mutual fund investors how they would rate corporate bonds for safety. The answers were the following Seguridad Frecuencia Very safe 62 Relatively safe 323 Not very safe 76 Not safe 26 Not safe at all 63 Does the attitude of mutual fund investors differ from corporate bonds from their attitude to corporate stocks? Support your conclusion by giving a statistical test. Use α = 0.01. For this problem you must present: -Hypothesis-Result of the expected values, residuals and the calculation of the test statistic.-Analysis of the results in the chi square test and its conclusion in applied terms of the problem
- With the rise of online shopping and the incoming 11.11 sale of Lazada and Shopee, you also set up a promotion in your online store as follows. With any purchase worth of Php1000 or more, the customer gets the chance to play once the spin-the-wheel as shown below. If a number 1 comes up, the customer wins Php500. If the number 2 comes up, the customer wins Php250; and if the number 3 or 4 comes up, the customer wins a discount coupon. Find the following probabilities.a. The customer wins Php500b. The customer gets a discount couponc. The customer wins moneyFiona is the course authority for a particular university course. In this course, students submit an assignment where they write an essay. Each essay is marked out of 20. Fiona has two tutors Anson and Jiefei who mark the essays. Fiona randomly assigns Anson to mark approximately half of the submitted essays and assigns Jiefei to mark the rest. Fiona wants to know if Anson is marking harsher than Jiefei is. In particular, Fiona wants to test the claim that the average mark awarded by Anson is less than the average mark awarded by Jiefei. Fiona randomly selects some of the essays marked by Anson and computes the average mark Anson awarded those essays. She also randomly selects some of the essays marked by Jiefei and computes the average mark Jiefei awarded those essays.It is claimed that the percentage of viewers tuned to a TV station's new sitcom is 30%. Out of the 250 viewers randomly selected only 29% are tuned to the TV station's new sitcom. Can it be concluded that the percentage of viewers tuned to TV station's new sitcom is less than 30%?
