Statistics question and answers for July 08, 2023
- Q The television habits of 30 randomly selected children wereobserved. The samplemean of time watching TV was found to be 48.2 hours per week,with a standarddeviation of 12.4 hours per week....
- Q lesson 40 homework study of different in tow populationproportionsSam claims that the proportion of all males who have been lockedout of their houses is less than the proportion of females...
- Q Researchers are interested in comparing the depression scores(measured on a scale of 1-100) of patients diagnosed with clinicaldepression before and after they have participated in a newexercise regimen. They take...
- Q A researcher is interested in determining if there is adifference in the amount of time babies pay attention to otherbabies and to adults.  The researcher takes a group of 26babies and...
- Q 1. What is the difference between the “Between Treatmentâ€sources in the One-Way ANOVA compared to the Two-Way ANOVA?2. Explain how and why the numerators changes when calculatingdifferent F-statistics in a...
- Q b) test statisticc) RRd) p-valuee) test decision
- Q Use the tree diagram technique that can be found inLecture 12 to solve this problem. Suppose that 50% of all peoplewho take a pregnancy test are, in fact, pregnant. A...
- Q Suppose Ari loses 31 ​% of all ping dash pong games . ​(a) Whatis the probability that Ari loses two ping dash pong games in a​row? ​(b) What is the...
- Q 10. The population mean of annual salary for plumbers is$46,700, with a standard deviation of $5600. A random sample of 42plumbers is drawn from this population. Find the probability thatthe...
- Q A box contains 5 chips marked 1, 2, 3, 4, and 5. One chip isdrawn at random, the number on it is noted, and the chip isreplaced. The process is...
- Q In 1974, Loftus and Palmer conducted a classic studydemonstrating how the language used to ask a question can influenceeyewitness memory. In the study, college students watched a film ofan automobile...
- Q Almost all medical schools in the United States require studentsto take the Medical College Admission Test (MCAT). To estimate themean score μ of those who took the MCAT on your...
- Q A haulage firm has 24 lorries, 15 of these are articulatedi) What is the probability that 3 randomly selected lorries arearticulated ?ii) what is the probability that no articulated lorries...
- Q What is the difference between a random sample and a simplerandom​ sample?
- Q Part 1:Using Excel’s Randbetween(0,9) function, generate 200 samples offive random numbers between 0 and 9, calculate the mean of eachsample. Show me the list of the 200 means. Typically, they...
- Q One of the tree planters on your team is a law student. You'vebeen talking to her (from a safe distance) about how the hypothesistesting process works in psychology and, in...
- Q Chi-Square testQuestion 1 Â Â Data havebeen collected over a period of several months on the means oftransportation used by most persons commuting to work into the cityoffice of a large...
- Q A service station has both self-service and full-serviceislands. On each island, there is a single regular unleaded pumpwith two hoses. Let X denote the number of hoses beingused on the...
- Q Find the critical value(s) for a hypothesis test using a sampleof size n = 12,a significance level α = 0.01 and null hypothesis H0: μ≤ 40.Assume that the population SD...
- Q Assume workers transition through the labor forceindependently with thetransitions following a homogeneous Markov chain with threestates:• Employed full-time• Employed part-time• UnemployedThe transition matrix is:0.90 0.07 0.030.05 0.80 0.150.15 0.15 0.70.•...
- Q Suppose a sample of 455 people is drawn. Of these people, 254passed out at G forces greater than 6. Using the data, estimate theproportion of people who pass out at...
- Q The Camera Shop sells two popular models of digital SLR cameras(Camera A Price: 200, Camera B Price: 300). The sales of theseproducts are not independent of each other, but rather...
- Q 2. A group of 24 physical doctors from three countries consistsof 7 Americans, 8 British and 9 Chinese. They (wearing masks) areseated at random around a (large enough) table to...
- Q According to a Gallup poll about gun ownership, in theyear 2016, 270 out of 600 (45%) U.S. households answered “yes†tothe question: “Do you have a gun in your home?â€.a....
- Q According to a study done by Pew Research Center, 210out of 500 adult Americans believe that marriage is nowobsolete.a. Find the mean and standard deviation of the samplingdistribution of ?Ì‚;...
- Q In the current tax year, suppose that 3% of the millions ofindividual tax returns have errors or are fraudulent. Althoughthese errors are often well concealed, let’s suppose that a throughIRS...
- Q The following data represent the age in weeks at whichbabies first crawl based on a survey of 12 mothers conducted byEssential Baby. 52 30 44 35 39 26 47 37...
- Q Please show work, write legibly!1. The researcher from the Annenberg School of Communications isinterested in studying the factors that influence how much timepeople spend talking on their smartphones. She believes...
- Q A machine that is programmed to package 3.30 pounds of cereal isbeing tested for its accuracy. In a sample of 49 cereal boxes, thesample mean filling weight is calculated as...
- Q Consider a population with a known standard deviation of 13.6.In order to compute an interval estimate for the population mean, asample of 40 observations is drawn. [You may find it...
- Q In order to construct a confidence interval for the populationvariance, a random sample of n observations is drawn froma normal population. Use this information to findχ2α/2,df andχ21- α/2,df underthe following...
- Q 1. Let z be a random variable with a standard normaldistribution. Find the indicated probability. (Round your answer tofour decimal places.)P(−2.13 ≤ z ≤ −0.35) =2. Assume that x has...
- Q The manager of the Burrard Credit Union wishes to know if thereis a significant differencebetween male and female customers’ interest in a proposed new typeof savings certificate. Asurvey of 200...
- Q Let x be a random variable that represents the level ofglucose in the blood (milligrams per deciliter of blood) after a12-hour fast. Assume that for people under 50 years old,...
- Q Find the missing value required to create a probabilitydistribution, then find the standard deviation for the givenprobability distribution. Round to the nearest hundredth.x / P(x)////////0 / 0.21 / 2 /...
- Q Question 1: We believe that the proportion of households inCalifornia who own a dog is less than the proportion of householdsin Texas who own a dog. In two independent polls,...
- Q A developmental psychologist prepares a video tape whichdemonstrates the “conservation of matterâ€. She selects 8 youngchildren from a day care and first tests them on this type ofproblem (that matter...
- Q Let X1. . . . Xn be i.i.d f(x; θ) = θ(1 − θ)^x x = 0.. Is therea function of θ for which there exists an unbiased estimator of...
- Q . A chain that specializes in healthy and organic foodwould like to compare the sales performance of two of its primarystores in the state of Massachusetts. These stores are both...
- Q Briefly define the measures R, Q, and s. What are the advantagesof using the standard deviation over range and interquartilerange?
- Q Lindsay is 27 years old and has a new job in web development.She wants to make sure that she is financially sound by the age of55, so she plans to...
- Q A random sample of 64 drivers used on average 747 gallons ofgasoline per year. The standard deviation of the population is 34gallons.Find the 99% confidence interval of the mean for...
- Q A random sample of 19 rainbow trout caught at Brainard lake,Colorado, had mean length x = 11.9 inches with sample standarddeviation o 2.8 inches.Find a 95% confidence interval for the...
- Q A jar contains 2 green marbles, G1 and G2, and 4 yellow marbles,Y1, Y2, Y3, and Y4. Imagine that we do not know this. Suppose thatour parameter p of interest...
- Q Background: Anorexia is well known to bedifficult to treat. The data set provided below contains data onthe weight gain for three groups of young female anorexia patients.These groups include a...
- Q A random sample of 25 employees of a local utility firm showedthat their monthly incomes had a sample standard deviation of $112.Provide a 90% confidence interval estimate for the standarddeviation...
- Q Imagine that proportion p = 0.82 of adults in a large city aremarried, but that this is not known, and we would like to estimatep. Suppose that we survey a...
- Q A) 100 random college students were asked abouttheir breakfastbeveragepreferences. 48drink coffee. 28drink orange juice.24drinkapple juice. 18 drink orange juice and coffee. 15 drink applejuiceand coffee. 8drink apple and orange juice....
- Q please show all the steps and in orderQ.5 Let X and Y be continuous rvs with the joint pdff(x, y) = 60(x^2)y, for 0 < x, 0 < y, 0...
- Q Our most accurate information about the current pandemic comesfrom Italy, where there are 101,739 confirmed cases out of apopulation of 60 million. This means about 0.17% of the entirepopulation are...
- Q why does the t test require the degrees of freedom and the ztest does not
- Q 5.Pashley Package Holidays has to decidewhether to discount its holidays to destinations abroad next summerin response to poor consumer confidence in international travelfollowing recent military events. If they do not...
- Q Why is regression analysis necessary in business? What twocategories of regression models are used? Explain
- Q What are the other names that omitted variable bias iscalled?
- Q Problem 1 This problem will present the same scenario twodifferent ways – the second one will add an additional piece ofinformation. For each scenario, you will construct an influencediagram, as...
- Q 1. Due to a major effort to remove lead from the enviroment overthe years, now only 9% of children in the U.S. are at risk of highblood levels of lead....
- Q Assume you wish to compare two distinct groups of people (e.g.,men vs women; old vs young; those with college degree versus thosewithout, those who shop online vs those who do...
- Q 2.) Suppose that the number of requests for assistance receivedby a towing service is a Poisson process with rate a = 6 perhour.a.) Find the expected value and variance of...
- Q Power+, produces AA batteries used in remote-controlled toycars. The mean life of these batteries follows the normalprobability distribution with a mean of 27 hours and a standarddeviation of 4.1 hours....
- Q In a study examining whether taking a statistics courseinfluences students’ reasoning skill, a researcher first gave areasoning task to 5 students who have never taken a statisticscourse, and then the...
- Q Mercedes tires at Tracy's plant are produced in a manufacturingprocess and the diameter is VERY important factor that must becontrolled.From sample sizes of 10 tires produced each day, the mean...
- Q A large supermarket carries four qualities of ground beef.Customers are believed to purchase these four varieties withprobabilities of 0.13, 0.27, 0.14, and 0.46, respectively, from theleast to most expensive variety....
- Q A particular fruit's weights are normally distributed, with amean of 652 grams and a standard deviation of 22 grams. If you pick7 fruit at random, what is the probability that...
- Q 1-Which type of bias can be minimized by masking the studysubjects to the study hypothesis and by using diseased controls ifconducting a case-control study?Selection biasMisclassification biasInterview biasRecall bias2-Which type of...
- Q Consider the following results for independent samples takenfrom two populations.Sample 1 Sample 2n1 = 500 n2= 300p1= 0.49 p2= 0.34a. What is the point estimate of the differencebetween the two...
- Q Kay Mary, senior vice president for marketing at TerrapinCosmetics, asked you to estimate, with 96% confidence, theproportion of all of the company’s customers who placed “largeâ€orders, meaning over $200, in...
- Q 6.32. Control charts for ¯xx¯ and Rare in use with the following parameters:¯¯¯xx¯ ChartR ChartUCL = 363.0UCL = 16.18Center line = 360.0Center line = 8.91LCL = 357.0LCL = 1.64The sample...
- Q \"Using data set 11-6; how many of the three factor interactionsare stronger than the single factor \"\"B\"\"\"11-6:ParameterReaction rateABCDg/min-1----46.9a+---71.1b-+--49.9c--+-70.4d---+44ab++--65.3ac+-+-62.4ad+--+101.5bc-++-81.8bd-+-+45.9cd--++76.4abc+++-66.9abd++-+105.8acd+-++86.1bcd-+++70.6abcd++++98.4
- Q 1) Suppose the scores of students on a Statistics course areNormally distributed with a mean of 542 and a standard deviation of98. What percentage of the students scored between 542...
- Q Problem 5a) Suppose that, in a random sample of 40 accounting studentswho had their second co-op term in W19, the sample mean and hourlywage and standard deviation were $20.10 and...
- Q In the book Essentials of Marketing Research, WilliamR. Dillon, Thomas J. Madden, and Neil H. Firtle discuss a researchproposal in which a telephone company wants to determine whetherthe appeal of...
- Q The state of Virginia shows than automobile is driven an average23,500 km/year with a stand deviation of 3900 kilometers. Assumethe distribution of measurements is approximately normal.a) What is the probability...
- Q A researcher believes that the proportion of male high schoolseniors who have their own cars is higher than the proportion offemale high school seniors who have their own cars. In...
- Q Historically, evening long-distance calls phone calls from aparticular city have averages 12 minutes per call. In a randomsample of 20 calls, the sample mean was 10.7 minutes per call witha...
- Q [02] For n ≥ 1, how many strings of length n using lettersa,b,c are there if the letter a must occur aneven number of times?
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