Basic Math question and answers for September 17, 2023
- Q Give an example of omitted variable bias in a multiple linearregression model. Explain how you would figure out the probabledirection of the bias even without collecting data on this omittedvariable....
- Q Patients arrive at Max hospital for X-ray according to a Poissonprocess. There is an X-ray machine and arriving patients form asingle line that feeds the X-ray machine in afirst-come-first-served order....
- Q Suppose a die is rolled six times and you need to finda) The probability that at least two 4 come upb) The probability that at least five 4's come upSolve...
- Q part 1.An independent measures study has df = 48. How many totalparticipants were in the study?a. 24b. 46c. 50d. There is not enough informationpart 2.A commonly cited standard for one-way...
- Q a) An environmental conservation agencyrecently claimed that more than 30% of Canadian consumers havestopped buying a certain product because the manufacturing of theproduct pollutes the environment. You want to test...
- Q A neighborhood council is interested in the family income andmedical care expenditures of its community. In particular, it isbelieved that lower income is related to more to medical careexpenditures. Below...
- Q Answer the correlation questions using the data below. Use ? =0.05.xy3.13.95.97.16.14.97.24.55.15.96.65.14.95.9a) Compute the correlation.r = b) Compute the appropriate test statistic(s) forH1: ? > 0.critical value = ; test statistic = Decision: ---Select--- Reject...
- Q 13) A logging truck sales representative can contact either oneor two potential buyers per day with probabilities of 0.25 and0.75, respectively. Each contact will result in either no sale or...
- Q The numbers 1,6,15,20,15,6,1 are the coefficients of thebinominal expansion (p+q)^6. Use the normal quantile plot method toshow that these numbers are close to a normal distribution.
- Q In the table below, there are test scores from a dozen students.The test was worth 200 points. The scores in the table are the # ofpoints out of 200. Letter...
- Q A few years? ago, a certain company introduced a line of? new,slick swimsuits. Some say that they gave the wearers an advantagein races. In order to test whether the suits...
- Q A vehicle quality survey asked new owners a variety of questionsabout their recently purchased automobile. One question asked forthe owner’s rating of the vehicle using categorical responses ofaverage, outstanding, and...
- Q A Pew Research Center survey asked respondents if they wouldrather live in a place with a slower pace of life or a place with afaster pace of life. The survey...
- Q A survey found that? women's heights are normally distributedwith mean 62.4 in. and standard deviation 2.1 in. The survey alsofound that? men's heights are normally distributed with mean 67.3in. and...
- Q When ? is unknown and the sample is of size n? 30, there are two methods for computing confidence intervals for?.Method 1: Use the Student's t distribution withd.f. = n...
- Q Answer the questions as indicated for scenarios 1-5. Note: Youdo not need to perform any of the procedures indicated.Scenario 3: A guidance counselor identifies a random sample of40 high school...
- Q Dana uses the following parameters to determine that she needs asample size of 140 participants for her study that will compare themeans of two independent groups (t-test) using a one-tailedhypothesis: Effect...
- Q 2.Thirty GPAs from a randomly selected sample of statisticsstudents at a college are linked below. Assume that the populationdistribution is approximately Normal. The technician in charge ofrecords claimed that the...
- Q Now let's use Bayes' theorem and the binomial distribution toaddress a Bayesian inference question. You toss a bent coin Ntimes, obtaining a sequence of heads and tails. The coin has...
- Q For a t-distribution with 15 degrees of freedom, 90% of thedistribution is within how many standard deviations of themean?Select one: a. 1.235 b. 1.576 c. 1.753 d. 1.960
- Q Cavalier Bike co sells their comfortable style bike for $90.Labor, material and overhead are listed: Week 1 Week 2 Week 3 Week 4#Bikes produced 1,117 1,306 1,092 985Labor ($) 12,691 14,842...
- Q You want to estimate the mean weight of quarters in circulation.A sample of 50 quarters has a mean weight of 5.643 grams and astandard deviation of 0.065 grams. Use a...
- Q General Electric recently conducted a study to evaluatefilaments in their industrial high intensity bulbs. Investigatorsrecorded the number of weeks each high-intensity bulb would lastbefore failure for three test filaments (Groups...
- Q A genetic experiment with peas resulted in one sample ofoffspring that consisted of 416 green peas and 156 yellow peas.a. Construct a 90?% confidence interval to estimate of thepercentage of...
- Q Aflight is said to be on time if it lands within 15 min. of itspublished arrival.a.) What is the minimum sample size needed to be 95% confidentwithin 2 percentage points...
- Q Anexample of a correlation problem ( finding degrees offreedom)Ineed an example of any correlation problem , including finding thedegrees of freedom. Provide any exsmple of a correlation mathproblem
- Q Cholesterol levels were collected from patients two days afterthey had a heart attack (Ryan, Joiner & Ryan, Jr, 1985) and arein table #3.3.10.Find the five-number summary and interquartile range (IQR)(3points),...
- Q #3Sand and clay studies were conducted at a site in California.Twelve consecutive depths, each about 15 cm deep, were studied andthe following percentages of sand in the soil wererecorded.29.630.326.230.026.928.9?26.527.527.829.529.323.8?Convert this...
- Q Suppose that you belong to a panel with representatives from theMinistry of the Environment and the Accreditation Services Branchof the Standards Council of Canada. You are responsible for testingscrubbers, i.e....
- Q Values of modulus of elasticity (MOE, the ratio of stress, i.e.,force per unit area, to strain, i.e., deformation per unit length,in GPa) and flexural strength (a measure of the ability...
- Q Does the research problem derive from theory, prior research, ormethodological considerations? Explain the rationale for yourresponse and what part of the narrative you used to arrive at theanswer.The relationship between...
- Q Determine whether each of the following statements istrue or false, and explain why in a few sentences.1. The mean, median, and mode of a normal distributionare all equal.2. If the...
- Q Allen's hummingbird (Selasphorus sasin) has been studied byzoologist Bill Alther.† Suppose a small group of 20 Allen'shummingbirds has been under study in Arizona. The average weightfor these birds is x...
- Q A study regarding the relationship between age and the amount ofpressure sales personnel feel in relation to their jobs revealedthe following sample information. At the 0.02 significance level,is there a...
- Q Each week coaches in a certain football league face a decisionduring the game. On? fourth-down, should the team punt the ball orgo for a? first-down? To aid in the? decision-making...
- Q Identify the level of measurement of each of the followingvariables (Nominal, Ordinal, or Scale (Ratio):1. County names in a state2. Number of participants in food stamp programs.3. Reputations of colleagues ranked...
- Q About 40% of all US adults will try to pad their insuranceclaims. Suppose that you are the director of an insuranceadjustment office. Your office has just received 128 insuranceclaims to...
- Q 1.Given the following contingency table, conduct a test forindependence at the 1% significance level. (You may find ituseful to reference the appropriate table: chi-square table or Ftable)Variable AVariable B121313223458Calculate the...
- Q An educational psychologist has developed a mediation techniqueto reduce anxiety. The psychologist selected a sample of highanxiety students that are asked to do the mediation at two therapysessions a week...
- Q 4. ( Just true or false for each, no need for explanation,thankyou)a.If factors being studied cannot be controlled, the data aresaid to be observational.True or Falseb.After rejecting the null hypothesis...
- Q Binomial Distribution. Suppose that X has a binomialdistribution with n = 50 and p = 0.6. Use Minitab to simulate 40values of X.MTB > random 40 c1;SUBC > binomial 50...
- Q HouseIDAge(years)Size(sqft)BedroomsPrice($1,000)1715803132.02817443123.93518633159.14718244126.05319244128.361017074145.47518983126.18520634128.49716413147.410715243121.511421443167.712915182109.213816453132.614527414212.315617183111.816717133119.617822404162.018618093145.119315884124.420919413129.821817834127.422621864141.823720184131.324423754164.225718014127.926522663158.827218913131.228625144173.329717383121.430620913170.031724954185.632515513111.4331018144134.934918223117.135622894186.836820803141.437917583137.638922993181.539821903139.240816713137.641715443137.44261331293.74361386386.544422194153.045517933129.446818123145.5471114993124.248417663134.649320603162.550915293109.15161276297.952720863146.85361395295.154414092116.055820093155.356718944144.15781190288.858518113152.659216893146.560716903136.461616853125.262615883127.663617303143.664519513158.865320403139.966817493141.26761111286.768517754116.269914782100.7701021253171.871415963135.172516103139.573417242151.474417133122.575914903115.3761018813152.477218683162.078822574163.679916144145.380517753143.781517703129.382222133175.183317433152.284620683162.885917053126.786617884138.587623344180.188515792103.089514782105.190420423167.291822633158.892916593122.593419784131.194415983125.295225234197.996718463143.597822923163.298818723153.899719543146.1100516793118.41). Which predictor variables are statistically significant atthe 10% significance level?2). What is the slope and p-value of the bedrooms variable?3). What percentage of the variability in price is explained...
- Q How to do with TI-83 Plus?In class we examined the linear relationship between shoe sizeand height for females. When looking at the male data, thefollowing statistics were computed. For shoe...
- Q Show that under the normality assumption, the F test isequivalent to the likelihood ratio test.
- Q Please use ONLY one Excel file to complete this case study, anduse one spreadsheet for each problem.Develop a linear regression model to predict Wal-Mart revenue,using CPI as the only independent...
- Q The average age of a vehicle registered in Canada is about 97months. If a random sample of 31 vehicles is selected, find theprobability that the mean of their age is...
- Q Let X1, X2, and X3 represent the times necessary to performthree successive repair tasks at a service facility. Suppose theyare normal random variables with means of 50 minutes, 60 minutes,and...
- Q Eight artists have been asked to rate the visual characteristicsof a painting done ?rst by black and white, and then inmulticolor.. After each of the paintings is finished, it is...
- Q A chemical manufacturer has been researching new formulas toprovide quicker relief of minor pains. His laboratories haveproduced three di?erent formulas, which he wanted to test. Fifteenpeople who complained of minor...
- Q Detail one instance in which regression analysis can be used ina business application. Explain what insights can be gained,limitations that must be considered, and outline one case exampleused in real...
- Q 1. Why would a researcher need to use a two-tailed test vs. aone-tailed test?2.A scholar tests the followinghypothesis: Females have a greater number ofdelinquent peers than males. In her test, shecalculates a...
- Q The following table shows ceremonial ranking and type of potterysherd for a random sample of 434 sherds at an archaeologicallocation.Ceremonial RankingCooking Jar SherdsDecorated Jar Sherds (Noncooking)Row TotalA8352135B9154145C7678154Column Total250184434Use a chi-square...
- Q 1) For 31 randomly selected Rolling Stones concerts, the meangross earnings is 2.61 million dollars. Assuming a populationstandard deviation gross earnings of 0.5 million dollars, obtain a99% confidence interval (assume...
- Q Diastolic blood pressure for diabetic women has a normaldistribution with unknown mean and a standard deviation equal to 10mmHg. Researchers want to know if the mean DBP of diabetic women...
- Q Problem 9-15Bay Oil produces two types of fuels (regular and super) bymixing three ingredients. The major distinguishing feature of thetwo products is the octane level required. Regular fuel must have...
- Q A simple random sample of sizen equals 16is drawn from a population that is normally distributed. Thesample variance is found to be13.7Test whether the population variance is greater than10at thealpha...
- Q The Merck Manual states that, for healthy adults, the meannumber of milliliters of oxygen per deciliter of blood is 19.0. Acompany that sells vitamins claims that its multivitamin complexwill increase...
- Q 1. If you were to toss a fair coin 5 times, how many differentpossible sequences of flips would there be?2. Suppose that employees at a large company are assigned an...
- Q (CO7) A state Department of Transportation claims that the meanwait time for various services at its different location is morethan 6 minutes. A random sample of 16 services at differentlocations...
- Q John is 37 years old and would like to establish a retirementplan. Develop a spreadsheet model that could be used to assist Johnwith retirement planning. Your model should include the...
- Q a bakery has bought 140 lbs of muffin dough. They want to makemuffins and waffles in half dozen packs out of it. A pack ofmuffins requires one pound of dough...
- Q in a survey of 2290 adults, 717 say they believe in UFO'sconstruct a 99% confidence interval for the populationproportion of adults who believe in UFOSa 99% confidence level for the...
- Q A large advertising firm specializes in creating televisioncommercials for children’s products. The firm wants to design astudy to investigate factors that may affect the lengths of time acommercial is able...
- Q a sample of 21 minivan electrical warranty repairs for "loose,not attached" wires (one of several electrical failure categoriesthe dealership mechanic can select) showed a mean repair cost of$45.66 with a...
- Q Jody is interested in the population mean of pets per householdin her neighborhood. She hypothesized that the average amount ofpets per household will be less than 3.To test the hypothesis,...
- Q Based on interviews with 94 SARS? patients, researchers foundthat the mean incubation period was 4.6 ?days, with a standarddeviation of 15.4 days. Based on this? information, construct a?95% confidence interval...
- Q Q: Calculate the mean, standard deviation, and 95% confidencelimits for each set.ABCDEF3.570.24.8122.770.65.5143.170.22.7923.070.63.5033.170.10.7942.670.64.4863.3.9002.870.21.4972.53.2.472Q2: A type of steel contains 1.12% nickel and the standarddeviation is 0.03%. The following data are collected (inpercent)a)...
- Q For each question in this assignment, you should upload youroutput and your explanations to Canvas. There are 3 questions inthis assignment. Enter the following data in SPSS and (a) produce...
- Q The following data were drawn from a normal population. Find a98.4% confidence interval for the mean.7 21 20 8 14 12 18 14 9 23
- Q An automobile manufacturer claims that its carsaverage more than 410 miles per tankful (mpt).As evidence, they cite an experiment in which 17 cars were drivenfor one tankful each andaveraged 420...
- Q Find the value of z such that 0.9108 of the area lies between ?z? z and z. Round your answer to two decimal places.
- Q Data: 7,-5, -8, 7, 9, 15, 0, 2, 13, 8, 6, -2, 4 (a) Mean= Mode=median= (b) Variance= Standard deviation= (c) Range=IQR(Interquartilerange)= (d) Mid-Range= Mid-Hinge=
- Q 6. Provide example of your own research question. Formulatehypothesis for your research question and independent and dependentvariables for this question.
- Q A regression analysis of college faculty salaries includedseveral predictors, including a dummy variable for gender (male =1) and a dummy variable for race (nonwhite = 1). Assume gendertakes on the...
- Q What type of data would be collected by the following surveyquestions? (a) How many pairs of shoes do you own? (b) What colorare your eyes? (c) Which brand of soft...
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