Statistics question and answers for August 12, 2023
- Q Use the t-distribution to find a confidence intervalfor a mean μ given the relevant sample results. Give the best pointestimate for μ, the margin of error, and the confidence interval.Assume...
- Q A) Many celebrities and public figures have Twitter accountswith large numbers of followers. However, some of these followersare fake, resulting from accounts generated by spamming computers.In a sample of 46...
- Q Thirty-two small communities in Connecticut (population near10,000 each) gave an average of x = 138.5 reported casesof larceny per year. Assume that σ is known to be 44.9cases per year.(a)...
- Q Do online students perform differently than students in atraditional classroom? Last semester there were 100 studentsregistered for the online version of a statistics course, and 100students registered for the traditional...
- Q When σ is unknown and the sample is of size n≥ 30, there are two methods for computing confidence intervals forμ.Method 1: Use the Student's t distribution withd.f. = n...
- Q Suppose that Randy is an analyst for the bicyling industry andwants to estimate the asking price of used entry-level road bikesadvertised online in the southeastern part of the United States....
- Q Every semester, I would like for more than 75%of my students to score a 70 or higher on the first test. Thissemester, out of the 72 students who took the...
- Q 1. Cantwo variables share a deterministic relationship, and yet beuncorrelated? For instance, suppose that X follows a continuous,uniform distribution between −1 and 1:X ~U[−1, 1].a.Draw a graph of the distribution...
- Q The mean incubation time for a type of fertilized egg kept at acertain temperature is 19 days. Suppose that the incubation timesare approximately normally distributed with a standard deviation of1...
- Q For which combination of population and sample size listed belowwill you find the sampling distribution of the sample meanapproximately normally distributed?a) Population is Right Skewed and n = 10b) Population...
- Q A poll is taken in which 348 out of 525 randomly selected votersindicated their preference for a certain candidate.(a) Find a 99% confidence interval for p.≤. p. ≤.(b) Find the...
- Q •An automobile insurer has found that repair claims have a meanof $920 and a standard deviation of $870. Suppose that the next 100claims can be regarded as a random sample...
- Q In this assignment students will demonstrate their understandingof the distribution of means doing all steps of hypothesistesting.For each problem students will write out all steps of hypothesistesting including populations, hypotheses,...
- Q A simple random sample with n=54 provided a sample mean of 24and a sample standard deviation of 4.3 .a. Develop a 90% confidence interval for the population mean (to1 decimal).b....
- Q According to the National Automobile Dealers Association, themean price for used cars is $10,192. A manager of a Kansas Cityused car dealership reviewed a sample of 50 recent used car...
- Q The length of time, in hours, it takes an \"over 40\" group ofpeople to play one soccer match is normally distributed with a meanof 4 hours and a standard deviation...
- Q An article considered regressing y = 28-daystandard-cured strength (psi) against x =accelerated strength (psi). Suppose the equation of the trueregression line is  y = 1900 +1.4x,and that the standard deviation of...
- Q John Smith, a baseballplayer, throws three types of pitches; fastball (FB), curveball(CB) and slider (SL). He throws a fastball 45% of the time, acurveball 28% of the time, and a...
- Q In a survey of 1000 randomly selected adults in the UnitedStates, participants were asked what their most favorite and whattheir least favorite subject was when they were in school(Associated Press,...
- Q In a particular year, 68% of online courses taught at a systemof community colleges were taught by full-time faculty. To test if68% also represents a particular state's percent for full-timefaculty...
- Q A sample of 150 homes for sale in ABC City showed a mean askingprice of $233,000, but the city claimed that the mean asking pricefor the population was $255,000. The...
- Q College students are accumulating increasing amounts of debtwhile they pursue their degrees. This debt has a significanteconomic affect as the new graduates strive to begin their lifeafter graduation. Nationally, the...
- Q How does significance level of a statistical test relate to ourdecision about whether an independent variable had an effect? Howdoes our choice of significance level impact the likelihood ofmaking a...
- Q Consider the following time series data.Week123456Value181317121715a. develop the three-week moving average forecasts for this timeseries. Compute MSE and a forecast for week 7 (to 2 decimals ifnecessary).b. use = 0.2...
- Q During the recent primary elections, the democratic presidentialcandidate showed the following pre-election voter support inAlabama and Mississippi. State Voters Surveyed Voters in favor ofDemocratic Candidate Alabama 710 352 Mississippi 915...
- Q Researchers at Johns Hopkins decide to use a case control studydesign to explore the association between women with breast cancerand DDT exposure. They interview women that have breast cancerundergoing chemo...
- Q Assuming that on average college students in the U.S. send 120text messages per day. A researcher wants to examine if the amountof text messages sent daily by UNC students differs...
- Q 2. The inside diameters of bearings used in anaircraft landing gear assembly are known tohave a standard deviation of s = 0.002 cm. A random sample of 15bearings has anaverage...
- Q Hanna FrontierSoftware Solutions, Inc. (HFSI) has been investigating thepossibility of developing a simulation software that can be usedfor analyzing risk and return from alternative lines of investment.The company is currently...
- Q suppose that an accounting firm does a study to determine the timeneeded to complete one persons tax forms. it randomly surveys 100people. the sample mean is 23.6 hours. there is...
- Q The data below show the number of injuries experienced byGryffindor and Ravenclaw quidditch players during each game theyplayed in the 2019 season: Gryffindor Ravenclaw52 3144 3814 2427 2814 2120 1313...
- Q A teacher is interested in her students’ opinion on whether thenon-required lecture is effective for them. She flips a coin everytime a student walks into lecture and if it lands...
- Q Suppose that the weights of airline passenger bags are normallydistributed with a mean of 49.53 pounds and a standard deviation of3.16 pounds.a) What is the probability that the weight of...
- Q Hypothesis testing conceptual questions: a. Define the null andalternative hypothesis b. What are the two errors that can occur inhypothesis testing? What mathematical symbols are used to denotethese errors? c....
- Q Why is it considered risky and unreliable to use the regressionformula to predict the dependent variable outside the range of theactual values of the independent variable is...
- Q Classified ads at a certain website offered several used cars ofa certain make and model. The accompanying table lists the ages ofthe cars and the advertised prices. Complete parts​ a)...
- Q Private colleges and universities rely on money contributed byindividuals and corporations for their operating expenses. Much ofthis money is invested in a fund called an endowment, and thecollege spends only...
- Q 1.) An adult patient being treated for severe muscle spasms hasher calcium level tested regularly because her condition could beattributed to a low calcium level. A random sample of her...
- Q 4. The time required to prepare a dry cappuccino using wholemilk at the Daily Grind Coffee   House is uniformly distributedbetween 30 and 40 seconds. Assuming a customer hasjust   ordered a...
- Q A between-subjects factorial design has two levels of factor Aand 2 levels of Factor B. Each cell of the design contains n=8participants. The sums of squares are shown in the...
- Q Big Box Store (BBS) has an annual rate of 4% of all sales beingreturned. In a recent sample of thirty randomly selected sales thenumber of returns was five.(Use binomial probability)What...
- Q For this project, you will analyze the famous casino game,Roulette. In the game of Roulette, there is a wheel consisting of38 numbers: 18 black numbers, 18 red numbers, and 2...
- Q You may need to use the appropriate appendix table to answerthis question.According to Money magazine, Maryland had the highestmedian annual household income of any state in 2018 at $75,847.†Assume that...
- Q A learning researcher is interested in the effectiveness of hernew memory enhancement program. To test this program, she has 15students learn a list of 50 words. Memory performance is measuredusing...
- Q Consider the data.xi31262014yi6535501520The estimated regression equation for these data isŷ = 70 − 3x.(a)Compute SSE, SST, and SSR using equationsSSE = Σ(yi −ŷi)2,SST = Σ(yi −y)2,andSSR = Σ(ŷi −y)2.SSE=SST=SSR=(b)Compute the...
- Q Via the same learning team as in Unit One, discuss examples ofprobability theory selected from your job or life (or roll dice),and share your results in a discussion post. I...
- Q Answer in sentences and be logical!(a) What does it mean for two events to be disjoint? What does itmean for two events to be independent? Give an example of each...
- Q The Ontario Ministry of Transportation is studying the relativesafety of compact cars, mid-sized cars, and full size cars. Safetydata is collected from a random sample of four cars for each...
- Q Use the sample data and confidence level given below to completeparts​ (a) through​ (d).A drug is used to help prevent blood clots in certain patients.In clinical​ trials, among 4330 patients...
- Q Given the computer output shown following for testing thehypotheses                                   Ho: (μ1 - μ2) = 0                                   Ha: (μ1 - μ2) > 0           What conclusion would you draw, with α = .10? What assumption(s)did you...
- Q A statistical analysis is made of the midterm and final scoresin a large course, with the following results: Average midtermscore = 65, SD = 10, Average final score = 65,...
- Q Every road has one at some point - construction zones that havemuch lower speed limits. To see if drivers obey these lower speedlimits, a police officer uses a radar gun...
- Q The owner of the House of Greens Greenhouse wants to estimatethe mean height that her seedlings grow. A sample of 29 plants werechosen and their growth was recorded over a...
- Q In a survey of 520 potential jurors, one study found that 360were regular watchers of at least one crime-scene forensicstelevision series.(a) Assuming that it is reasonable to regard this sample...
- Q In 2017, the entire fleet of light‑duty vehicles sold in theUnited States by each manufacturer must emit an average of no morethan 86 milligrams per mile (mg/mi) of nitrogen oxides...
- Q Two catalysts are being analyzed to determine how they affectthe mean yield of a chemical process. Specifically, catalyst 1 iscurrently used. Because catalyst 2 is cheaper, it should beadopted, if...
- Q Construct a confidence interval for p1−p2 at the given level ofconfidence. x1= 396​, n1= 503​, x2= 424​, n2= 587​, 95​%confidenceThe researchers are __?__​% confident the difference between thetwo population​ proportions,p1−p2​,...
- Q How do multiple comparison techniques differ when we do two-wayANOVA as compared to one-way ANOVA?
- Q A start-up company has 2000 investors, that companyloses investors at a rate of 10 per year. Every time the companyloses an investor, the company gets a loss of $200,000. For...
- Q 4. A study of the effect of television commercials on12-year-old children measured their attention span, in seconds. Thecommercials were for clothes, food, and toys.ClothesFoodToys3542563239423439533555602847633142531734483143582057474751445154Â Â Click here for the Excel Data FileComplete...
- Q QuestionRunners is a well established company with thousands ofemployees and they want to estimate the average age of theirworkers. A sample of 10 employees was taken. Assuming thepopulation has a...
- Q 1) These numbers are measurements of the left and right clawlength (cm) from 8 crabs. On average, is left claw length differentfrom right claw length?Crab_IDLeftRight17.07.126.36.536.16.846.16.456.36.467.07.475.85.686.06.5
- Q Suppose x has a distribution with μ = 17 andσ = 13.(a) If a random sample of size n = 42 is drawn, findμx, σxand P(17 ≤ x ≤ 19)....
- Q Recall that Benford's Law claims that numbers chosen from verylarge data files tend to have \"1\" as the first nonzero digitdisproportionately often. In fact, research has shown that if yourandomly...
- Q Suppose the heights of 18-year-old men are approximatelynormally distributed, with mean 67 inches and standarddeviation 6 inches.(a) What is the probability that an 18-year-old man selected atrandom is between 66...
- Q 1a. Given: mean difference between men and women = 2.2; standarderror of mean difference = 0.8; n men = 61, n women = 61.Test the following null hypothesis at a=.05Ho:...
- Q The air temperature is measured every 6 hours for one week. Thetemperatures are given in the data table. Use the data to completeparts a through e below. _# Temperature 1...
- Q A tire manufacturer claims that the life span of its tires is52,000 miles. Assume the life spans of the tire are normallydistributed. You selected 16 tires at random and tested...
- Q a wine producer intends to limit the variance in the amount ofalcohol of a bottle to be less than .15 to ensure quality control.A random sample of 45 bottles resulted...
- Q Five years ago the average university student owed $19,000 instudent-loan debt at the time of graduation. With all the cuts infunding, it is suspected that this amount has gone up....
- Q Obesity in adult males is associated with lower levels of sexhormone. A study investigated a possible link between obesity andtestosterone levels in adolescent males between the ages of 14 and20...
- Q Jobs are sent to a printer at an average rate of 6 jobs perhour.(a) What is the expected time between jobs? [Note: Give theexact answer either in hours or in...
- Q A graduate student in the School of Education is interested inwhether families of students in the Chicago Public Schools are foror against the new legislation proposing school uniformrequirements. She surveys...
- Q Average pizza delivery times to the West Loop are normallydistributed with an unknown population mean and a populationstandard deviation of six minutes. Students in 270 at UIC collect arandom sample...
- Q The McCollough Corporation, a producer of various kinds ofbatteries, has been producing \"D\" size batteries with a lifeexpectancy of 87 hours. Due to an improved production process, themanagement believes that...
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