Statistics question and answers for July 09, 2023
- Q Randall grew up in Ohio but now lives in California. He knowsthat snow sucks and makes driving a nightmare. His father, Douglas,owns a specialty cars dealership chain in Ohio. Douglas...
- Q QUESTION 4A researcher is interested in testing whether there is adifference in aggression levels between kids who watch only TVshows, only play video game, or watch TV and play video...
- Q An electric company received a shipment of several thousandresistors with 100 ohm ratings. A sample of nine resistors wasmeasured with a laboratory standard instrument and gave thefollowing measurements (assume that...
- Q Question 1For correlation, you will ask if the slope of the line relatingvariable X and variable Y is significantly different from zeroTrueFalseQuestion 2For regression, you test if the R2 value...
- Q What is a residual plot and how should itlook?What kind of statistical test would youuse?What is Cook's distance?What are “LINE†approximations in regressionanalysis?
- Q In a study of monthly salary distribution of residents in Parisconducted in year 2015, it was found that the salaries had anaverage of €2200 (EURO) and a standard deviation of...
- Q Numerical proof of Var(X + Y ) = σ 2 X + σ 2 Y + 2Cov(X, Y):***Please use R commands, that is where my confusion lies***2.1 State how you...
- Q If a variable is Normal (µ = 10, σ = 1.2)to. Find the probability that X is between 10 and 12. (10points)b. Calculate the X corresponding to the 80% percentile...
- Q D3 a product is either rectangular or triangular. What is theprobability that, in a random sample of 10 units, there are morethan 8 rectangular units of product? Round your answer...
- Q SE-FamilySize114324234241422454544243123555Make a confidence interval. Be sure you show all the steps youtook. Include a screen shot of any applet you used in yourcalculations.2. Choose a confidence level (1 – α).3....
- Q Fruit flies, like almost all other living organisms, havebuilt-in circadian rhythms that keep time even in the absence ofexternal stimuli. Several genes have been shown to be involved ininternal timekeeping,...
- Q A sample of 44 observations is selected from a normalpopulation. The sample mean is 24, and the population standarddeviation is 3. Conduct the following test of hypothesis using the0.05 significance...
- Q . Define the stochastic processXt=2A+3Bt wherePA=2=PA=-2=PB=2=PB=-2=0.5.Find PXt≥0 | t Â
- Q Answer the following questions using R (include both the inputand output for each question).I) A random variable P has a Poisson distribution with a mean of10. Solve for the probability...
- Q Problem Binomial Distribution: A consumeradvocate claims that 80 percent of cable televisionsubscribers are not satisfied with their cable service. Inan attempt to justify this claim, a randomly selected sample ofcable...
- Q A sample of parts provided the following contingency table dataon part quality by production shift.Shift Number Good Number DefectiveFirst 368 32Second 285 Â Â 15Third 176 24Use a=.05 and test the hypothesis...
- Q Question 1Both F and Chi Square distributions are unimodal andsymmetricTrueFalseQuestion 2Both F and Chi Square distributions vary with dfTrueFalseQuestion 3Both F and Chi Square distributions can be used to comparemultiple...
- Q Answer the following questions using R (include both the inputand output for each question).I) A random variable P has a Poisson distribution with a mean of10. Solve for the probability...
- Q Suppose that a study shows that an electric bike is driven23,500 km/year on average and has a standard deviation of 3900 km.Assume that the measurements’ distribution is approximatelynormal.a) Calculate the...
- Q Please very important to explain all the transactionsanswersChapter 12 Monte Carlo Simulation and RiskAnalysis3. A professional football team is preparing its budget for thenext year. One component of the budget...
- Q The 22,000 students at NCC have mean mileage on their vehiclesof µ = 54,000 miles      with a standard deviationof s = 3,125 miles. Assuming a normal distribution   a) what is the...
- Q A student is taking a quiz with nine questions. Each questionhas answers: A, B, C, or D. The student guesses on eachquestion          a) how many repetitions for thisproblem?     b) what...
- Q Business Weekly conducted a survey of graduates from 30 top MBAprograms. On the basis of the survey, assume the mean annual salaryfor graduates 10 years after graduation is $121,000. Assume...
- Q Problem 4. The data {(1, 10),(2, 5.49),(3, 0.89),(4, −0.14),(5,−1.07),(6, 0.84)} comes from a model F(x) = (r/ x )+ sx. Use leastsquares to estimate the parameters r, s.
- Q The manager of a computer retails store is concerned that hissuppliers have been giving him laptop computers with lower thanaverage quality. His research shows that replacement times for themodel laptop...
- Q Hypotheses are defined as:“Hypotheses are single tentative guesses, good hunches—assumedfor use in devising theory or planning experiments intended to begiven a direct experimental test when possible†(Rogers,1966).“Hypothesis is a formal...
- Q In a survey of 2508 2508 adults in a recent​ year, 1395 1395 saythey have made a New​ Year's resolution. Construct​ 90% and​ 95%confidence intervals for the population proportion. Interpret...
- Q The rental car agency has 30 cars on the lot. 10 are in greatshape, 16 are in good shape, and 4 are in poor shape. Four cars areselected at random...
- Q Abulletproof vest manufacturer has 1000 bulletproof vests for sale.Each vest has a 5% probability of experiencing a failure resultingin a serious injury or death. You randomly select 200 vests forpotential...
- Q 1) A normal random variable x has an unknown meanμ and standard deviation σ = 2. If theprobability that x exceeds 4.6 is 0.8023, find μ.(Round your answer to one...
- Q Suppose you gather a sample size of 20 widgets and construct a99% confidence interval for the mean number of widgets.Assuming this research follows approximately normal with unknownmean and variance, what...
- Q Bulldog, Inc. is a Texas-based audio equipmentmanufacturer. It produces two kinds of audio speakers. The firstkind is a bookshelf speaker, called BSS. The other kind is a floorspeaker, called FLS.Both...
- Q Describe a confidence interval for the mean of a population bystating1. a population and a quantitative variable on thatpopulation,2. a sample size,3. a sample mean of that variable, and4. a...
- Q Demonstrate understanding of the Central Limit Theorem, using R,by showing how the distribution of the sample mean changesaccording to sample size.Consider a Poisson distribution with λ = 1.5.Generate samples of...
- Q Problem 1 Let X1, X2, . . . , Xn be independent Uniform(0,1)random variables. (a) Compute the cdf of Y := min(X1, . . . , Xn).(b) Use (a) to...
- Q In the R programming language, we would like to use the dataset called iris to build a simple linear regression model topredictSepal.Length based onPetal.Length.Calculate the least squares regression line to...
- Q 3. Using the R data set called warpbreaks (See ?warpbreaks formore info), we want to compare the mean breaks across both thedifferent types of wool and the different levels of...
- Q There are four numeric columns in R programming language's irisdata set. Create a scatter plot between the four numeric columnsusing R programming language and give answers to the followingparts.Calculate the...
- Q Define ANOVA and fully discuss the F ratio. What informationdoes an ANOVA summary table provide?
- Q The employee credit union at State University is planning theallocation of funds for the coming year. The credit union makesfour types of loans to its members. In addition, the credit...
- Q What is the H0 rejection region for Z (i.e. standardnormal distribution) for a two-tailed test with α/2 = .025?Select one:a. Reject H0 if z < 1.96 or z > -1.96b....
- Q Using the R built-in data set called Chick Weight, we want tocompare the mean weight across the different types of Diet.IMPORTANT: We only want to compare chicks at the final...
- Q For the following questions , identify the type of test thatshould be used. Simply use the corresponding letter: A) One-samplez test (for a mean); B) One-sample t-test; C) One-sample z-test...
- Q This week, a very large running race (5K) occured in Denver. Thetimes were normally distributed, with a mean of 24.03 minutes and astandard deviation of 3.04 minutes. a. What percent...
- Q 1. If the original population is normally distributed, willrandom sample means and random sample percentage have distributionthat is also normally distributed? Explain.2. If the original population is skewed, will random...
- Q Customers arrive at a service center according to a Poissonprocess with a mean interarrivaltime of 15 minutes.If two customers were observed to have arrived in the firsthour, what is the...
- Q A company is interested in the satisfaction of their employees,so they hired a consulting firm to conduct an in-house study.Employees were classified into three categories (support staff,analysts and executives) and...
- Q A nearby park is comprised of 15% pine, 20% elm, 30% alder and35% cedar. In the spring, the surrounding city is flooded withpollen. You wonder whether these four tree species...
- Q Some say that optimal estimators should be preferredwhile others advocate the use of more robust estimators. What isyour opinion? (250 words)
- Q A random sample of 1,496 respondents of a majormetropolitan area was questioned about a number of issues. Whenasked to agree or disagree with the statement “Hand guns should beoutlawedâ€, 650...
- Q Hermit crabs live in shells, but they don't grow the shellsthemselves. They find an abandoned snail shell and make it theirhome. They inhabit shells of different snail species, but it's...
- Q Suppose you actually had 200 independent units in the sample andcalculated the sample mean of 91.15g. The sample standard deviationis 0.9 grams. How many units from your new sample of...
- Q 1.  In a recent report released by Consumer Reports,it was reported that 7 in 10 auto accidents involve a singlevehicle (thus, 3 out of 10 involve multiple vehicles). Suppose 15accidents are...
- Q Can you provide an example of hypothesis testing in quantitativeresearch and one in qualitative research?
- Q The Business Education Department has six full-time facultymembers. At their monthly department meeting, each full-timefaculty member reported the number of hours they taught during thepast month:Faculty Member Teaching HoursBernhardt 84,...
- Q Out of 480 respondents in a recent health survey 42 reported ahistory of diabetes.a. Estimate the true proportion of people with a history ofdiabetes with 95% confidence.b. Using the survey...
- Q 1. . In a survey of 1000 American adults conducted inApril 2012, 430 reported having gone through an entire week withoutpaying for anything in cash. Test at 1% significance level...
- Q An amusement park studied methods for decreasing the waitingtime (minutes) for rides by loading and unloading riders moreefficiently. Two alternative loading/unloading methods have beenproposed. To account for potential differences due...
- Q . All of the following are true of two-tailed tests except:A. Two-tailed tests are more “conservativeâ€, they make rejectingthe null hypothesis harder
B. Two-tailed tests are used when there is not...
- Q In his Ph.D. dissertation, Dr. Moser found the followingvariances in a population of yearling Brangus cattle measured forfat thickness with ultrasound:                                   σ2BV = .001cm2         σ2E = .009 cm2           Assuming variance of gene combination...
- Q For each of the studies, please indicate the following:1) Independent variable(s)2) Number of IVs3) The levels the independent variable(s)4) Dependent variable(for correlation, list all variables here)5) Between (B/S) or within-subjects...
- Q A paleontologist examines 39 skeletons of a new species ofdinosaur and finds that the average length of the right femur is 90cm, with a standard deviation of 9 cm.a. Does...
- Q Women have a mean systolic blood pressure of 125.17 with astandard deviation of 10.34. Female blood pressure is known to benormally distributed.(a) Find the probability that a randomly selected female...
- Q The customers association thought that the mean number of daysfor a package to arrive in Australia is more than 13 days. Assumethat the population standard deviation is unknown. Does the...
- Q The number of parking tickets issued in a certain city on anygiven weekday has a Poisson distribution with parameter μ = 40.(Round your answers to four decimal places.) (a) Calculate...
- Q Problem 2.You pay 5$ /round (nonrefundable) to play the game of rolling apair of fair dice.If you roll an even sum, you lose, no pay off. If you roll anodd...
- Q If np >= 5 and nq >= 5​, estimate Upper P( fewer than 6)with n =13 and p= 0.5 by using the normal distribution as anapproximation to the binomial​ distribution;...
- Q I do not know why I keep getting this question wrong, I triplechecked my work!A distribution of values is normal with a mean of 80 and astandard deviation of 18....
- Q Exercise 4 (Indicator variables). Let (Ω, P) be a probabilityspace and let E ⊆ Ω be an event. The indicator variable of theevent E, which is denoted by 1E ,...
- Q An article reported that what airline passengers like to do moston long flights is rest or sleep; in a survey of 3697 passengers,almost 80% did so. Suppose that for a...
- Q First-born children tend to develop language skills faster thantheir younger siblings. One possible explanation is that they haveundivided attention from their parents. If this is correct, thentriplets should be slower....
- Q supposed 57% of the population has a retirement account. if arandom samples of size 421 is selected, what is the probabilitythat the proportion of persons with a retirement account willdiffer...
- Q what is the answer for question 4 Determine who placed20th in the men’s and the women’s 10,000 meter races atthe 2016 Summer Olympics in Rio de Janeiro. Record the names,nationalities,...
- Q A product is being assembled and packaged on three productionlines (line A, line B, and line C). Each day, the quality controlteam selects a production line and inspects a batch...
- Q Determine the margin of error for a 99​% confidence interval toestimate the population mean when s​ = 43 for the sample sizesbelow. ​a) n=12 ​b) n=25 ​c) n=46 ​a) The...
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