Statistics question and answers for August 25, 2023
- Q During the recent primary elections, the democratic presidentialcandidate showed the following pre-election voter support inAlabama and Mississippi.StateVoters SurveyedVoters in favor ofDemocratic CandidateAlabama750400Mississippi900560We want to determinewhether or not the proportions of...
- Q Briefly explain in words the relationship between thenonresponse rate and the bias of nonresponse for an estimate of thepopulation mean.
- Q The table below gives the list price and the number of bidsreceived for five randomly selected items sold through onlineauctions. Using this data, consider the equation of the regressionline, yˆ=b0+b1xy^=b0+b1x,...
- Q Stephanie's judges try thousands of cases per year. In anoverwhelming majority of the cases disposed, the verdict stands asrendered. However, some cases are appealed, and of those appealed,some of the...
- Q SUMMARY OUTPUTRegression StatisticsMultiple R0.195389R Square0.038177Adjusted R Square0.037333Standard Error13.69067Observations1142ANOVAdfSSMSFSignificance FRegression18481.2558481.25545.24922.74E-11Residual1140213675.2187.4344Total1141222156.4CoefficientsStandard Errort StatP-valueLower 95%Upper 95%Lower 95.0%Upper 95.0%Intercept40.196310.59674167.35967039.0254741.3671439.0254741.36714X Variable 17.31E-051.09E-056.7267522.74E-115.18E-059.45E-055.18E-059.45E-05Discuss the statistical significance of the model as wholeusing the appropriate regression statistic at...
- Q Formula=IF(RAND()>0.5,T.INV(RAND(),10)-2,T.INV(RAND(),10)+2observationsample 111.3770027821.82737804533.47901338741.38260462652.57203945162.3823493970.2404143498-1.34743234992.8577793310-3.37997899211-2.746482213121.88644275613-1.947527669141.54075454815-0.23317487616-1.10407970217-1.226712691183.300631732190.94036848420-1.84511356921-1.25073391822-1.392547733232.478557615240.823135564251.630991977samplemean0.489827213Use the excel spreadsheet to simulate 1000 samples of size 25 bycopying cells C:3 through C:27 and pasting into rows 3 through 27in the adjacent columns. For each sample...
- Q Use Excel and write formula of Chi square to Find the criticalvalues check your answers with the tables of Chi square CriticalValue:  1- χ^2_(.05,25)  2- χ^2_(.01,6)  3- χ^2_(.05,10)
- Q The owner of a bistro called First Crush in Potsdam, NY wasinterested in studying the tipping patterns of his customers. Hecollected 157 restaurant bills over a two week period that...
- Q Q1) construct a contingency tablefor the positive and non-positive returns of the two stocksDateBITMAC11/3/1352.0637.714518/3/1353.8434.862625/3/1399.9936.53441/4/13139.2336.0238/4/13113.0737.537515/4/13123.9335.383822/4/13141.3637.350629/4/13126.542.39566/5/13120.3945.208213/5/13125.543.811820/5/13142.5241.854727/5/13137.8842.45463/6/13115.6639.661710/6/13120.9840.861517/6/13125.2841.12724/6/13111.9741.17621/7/1397.5441.26478/7/13114.9543.998615/7/1396.543.329922/7/139242.297329/7/1399.9544.4515/8/13125.4943.02512/8/13104.143.683919/8/13109.5343.890426/8/13158.7543.13322/9/13136.1245.40499/9/13147.8747.991316/9/13143.0949.171523/9/13142.0848.089730/9/13140.2447.74557/10/13151.7747.253814/10/13193.5249.338621/10/13213.8950.351628/10/13233.552.22014/11/13331.0553.655911/11/13547.0853.646118/11/13974.5553.596925/11/131191.9953.28222/12/131016.2750.99089/12/131027.8251.33516/12/13781.7854.823/12/13889.1154.9530/12/1399955please construct on on excel.
- Q According to a report from Microsoft, 24% of PCs worldwide arenot adequately protected by antivirus software.19 Suppose 200 PCsfrom around the world are selected at random.a. Find the distribution of...
- Q A study was done to look at the relationship between number ofvacation days employees take each year and the number of sick daysthey take each year. The results of the...
- Q Suppose we keep rolling a tetrahedral die (with faces marked as1, 2, 3, 4) till an even number appears for the first time.(a) Give a precise description of the sample...
- Q Quick question, so say I have a mean of 511, a standarddeviation of 124 and then I have less then 650. I do 650-511=139. Itake the 139 and divide that...
- Q Consider the phrase \"confidence interval\" - what does the word\"confidence\" imply and what is the information provided by the word\"interval\"?
- Q A dentist wants to find the averagetime taken by one of her hygienists to take X-ray and clean thetooth for her patients. She recorded the time to serve 24 randomlyselected...
- Q What are examples of:1. Sampling Error.2. Sampling Distribution of Sample Means3. Central Limit Theorem.4. Standard Error of the Mean. The standard error of theestimate of the mean is represented by...
- Q Using MIL STD 105 E, probability of accepting a lot acceptancenumber when the lot size is 600,000 units, the inspection is normalgeneral level I. Acceptance quality level is 0.025% and...
- 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 A random survey of enrollment at 35 community colleges acrossthe United States yielded the following figures: 6,415; 1,549;2,107; 9,348; 21,829; 4,300; 5,943; 5,724; 2,824; 2,043; 5,483;5,199; 5,855; 2,749; 10,010; 6,359;...
- Q The data in the accompanying table represent the rate of returnof a certain company stock for 11​ months, compared with the rateof return of a certain index of 500 stocks....
- Q What is hypothesis testing? Explain fully and provide areal-world example.
- Q Describe the two ways to test for multicollinearity. Which onedo you prefer?
- Q Let Y be the sum of two fair six-sided die.(a) Find the PMF of Y.(b) What is the expected value of Y ?(c ) What is the standard deviation of...
- Q To demonstrate flavor aversion learning (that is, learning todislike a flavor that is associated with becoming sick),researchers gave one group of laboratory rats an injection oflithium chloride immediately following consumption...
- Q Howto get the percent of scores in one and two standard deviations ofthe mean
- Q In a study of treatments for very painful​ \"cluster\"headaches,159159patients were treated with oxygen and154154other patients were given a placebo consisting of ordinary air.Among the159159patients in the oxygen treatment​ group,111111were free...
- Q In a survey of 3,778 adults concerning complaints about​restaurants, 1,436 complained about dirty or​ ill-equippedbathrooms and 1,213 complained about loud or distracting diners atother tables. Complete parts ​(a) through​ (c)...
- Q Exercise 13-58 (LO13-2, LO13-3)A consumer buying cooperative tested the effective heating areaof 20 different electric space heaters with different wattages.Here are the results.HeaterWattageArea175016827505831,5005647505151,00023761,25010571,00013982,00019791,25080101,5001661175075121,750292132,00049141,25078151,75026916750162171,250171181,500147192,000244201,00073Compute the correlation between the wattage and heating...
- Q 5. A professor theorizes that science students performdifferently on multiple choice tests than on essay tests. Theprofessor recruited 6 science students and had them take both typesof test. Their test...
- Q Exercise 13-60 (LO13-2, LO13-3, LO13-5)Waterbury Insurance Company wants to study the relationshipbetween the amount of fire damage and the distance between theburning house and the nearest fire station. This information...
- Q Eyeglassomatic manufactures eyeglasses for different retailers.The number of days it takes to fix defects in an eyeglass and theprobability that it will take that number of days are in the...
- Q Suppose I wanted to know whether a surprise quiz before themidterm improves your midterm score. Suppose I’m teaching twosections of this class, and I decide to test this by setting...
- Q A realistic estimate for the probability of an engine failure ona transatlantic fight is 1/14000. Use this probability and thebinomial probability formula to find the probabilities of 0, 1, 2,and...
- Q Assume that the population of all sister-brother heights has abivariate normal distribution and that the data below were sampledfrom this distribution.Sister height (x) 69 64 65 63 65 62 65...
- Q There are two routes to get from the student dorms to class - along route, which is scenic, and a short route, which is notscenic. You want to study whether...
- Q find the expected value and the variance of the number of timesone must throw a die until outcome 1 has occurred 4 times. This isthe negative binomial distribution
- Q A probability experiment is conducted in which the sample spaceof the experiment is {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}​,event F={4, 5, 6, 7, 8}​,...
- Q According to a report by the Commerce Department in the fall of2004, 20% of U.S. households had some type of high-speed Internetconnection. Let Nn denote the number of U.S.households with...
- Q Assume that 5 cards are dealt at random from a standard deck of52 cards (there are 4 suits in the deck and 13 different values(ranks) per each suit). We refer...
- Q A new online test preparation company compared 3,025 studentswho had not used its program with 2,150 students who had. Of thosestudents who did not use the online test preparation program,...
- Q The ages of 30 patients admitted in a certain hospital during aparticular week were as follows:48, 31, 54, 37, 18, 64, 61, 43, 40,71, 51, 12, 52, 65, 53,42, 39,...
- Q The Thomas Supply Company Inc. is a distributor of gas-poweredgenerators. As with any business, the length of time customers taketo pay their invoices is important. Listed below, arranged fromsmallest to...
- Q A 2010 survey by a reputable automotive website found that 62​%of vehicle owners avoided automotive maintenance and repairs.Suppose a company would like to perform a hypothesis test tochallenge this finding....
- Q Why are the costs different between the traditional method andthe activity-based method?
- Q A certain system can experience three different types ofdefects. Let Ai (i = 1,2,3) denote theevent that the system has a defect of type i. Suppose thatthe following probabilities are...
- Q Consider the following sample data for the relationship betweenadvertising budget and sales for Product A: Observation 1 2 3 4 5 67 8 9 10 Advertising ($) 90,000 100,000 100,000...
- Q 1.Weights, in pounds, of ten-year-old girls are collected from aneighborhood. A sample of 26 is given below. Assuming normality,use Excel to find the 98% confidence interval for the populationmean weight...
- Q A textile manufacturing process finds that on average, threeflaws occur per every 220 yards of material produced.What is the probability of no more than two flaws in a 220-yearpiece of...
- Q 16. Assume that human body temperatures are normally distributedwith a mean of 98.22°F and a standard deviation of 0.64°F.a. A hospital uses 100.6°F as the lowesttemperature considered to be a...
- Q The average number of times Americans dine out in a week fellfrom 4.0 in 2008 to 3.8 in 2012 (Zagat.com, April 1, 2012). Thenumber of times a sample of 20...
- Q A roll of plastic-coated wire has an average of 0.09 flaws per5-meter length of wire. Suppose a quality control engineer willsample a 5-meter length of wire from a roll of...
- Q In studying his campaign plans, Mr. Singleton wishes to estimatethe difference between men's and women's views regarding his appealas a candidate. He asks his campaign manager to take two randomindependent...
- Q At a doctor’s office, patients are called in from the waitingroom according to a Poissondistribution with an average of 2 patients every 15minutes.a) On average, how many patients are called...
- Q Companies often have different mutual funds to serve differentinvestment time horizons. Use the tab titledBESTFUNDS to determine if there is adifference between in the three-year annualized return for smallcap growth,...
- Q A sociologist records the annual household income (in thousandsof dollars) among a sample of families living in a high-crimeneighborhood. Locate the lower, median, and upper quartiles for thetimes listed below....
- Q Assume that a simple random sample has been selected from anormally distributed population and test the given claim. Identifythe null and alternative​ hypotheses, test​ statistic, P-value, andstate the final conclusion...
- Q Given a normal distribution with μ=55 and σ=4​, complete parts​(a) through​ (d).a) What is the probability that X>48​? ​(Round to fourdecimal places as​ needed.)b) What is the probability that X<47​?...
- Q Television viewing reached a new high when the globalinformation and measurement company reported a mean daily viewingtime of 8.35 hours per household. Use a normal probabilitydistribution with a standard deviation...
- Q A hotel manager is looking to enhance the initial impressionthat hotel guests have when they check in. Believed to contributeto initial impressions is the time it takes to deliver a...
- Q Mutual funds mix different types of investments which altersperformance. Use the tab titledBESTFUNDS1 to determine if there is adifference between the one-year and three-year annualized returnfor the 20 mutual funds...
- Q After living together for a year, Mary, Martha, and Alice havedecided to go their separate ways. They have several items theybought together as well as some moving-out chores to divide....
- Q If the true data generating process is normal, how will thebin widths of Scott's rule and Freedman-Diaconis compare?
- Q Suppose you have a connected network of two-way streets. Showthat you can drive along these streets so that you visit allstreets and you drive along each side of every street...
- Q 1. A soccer player will kick a ball 80 times during practice.Assume that the kicks are independent of eachother, and the probability that he scores is 0.6 (60% chance thatthe...
- Q Given independent random​ variables, X and​ Y, with means andstandard deviations as​ shown, find the mean and standard deviationof each of the variables in parts a to d.​a) X−11​b)0.7Y​c)X+Y​d)X−Y  MeanSDX9013Y205​a) Find...
- Q PLEASE SHOW HOW TO SOLVE IN EXCEL SHOW STEPSRefer to the Johnson Filtration problem introduced in thissection. Suppose that in addition to information on the number ofmonths since the machine...
- Q Determine the sampling method used in the following scenariosand state whether it is generally biased, or generally unbiased. Ifa method is generally biased give a reason why it may be...
- Q You are given the sample mean and the population standarddeviation. Use this information to construct the​ 90% and​ 95%confidence intervals for the population mean. Interpret the resultsand compare the widths...
- Q We had an example in class about using a sign test. We aresupposed to find the b value by using the binomial table.b(alpha,n,1/2) which for this problem equals b(.05,10,1/2). Whenyou...
- Q Using the unit normal table, find the proportion under thestandard normal curve that lies between the following values.(Round your answers to four decimal places.) (a) the mean and z =...
- Q A recent study found that 51 children who watched a commercialfor Walker Crisps featuring a long-standing sports celebrityendorser ate a mean of 36 grams of Walker Crisps as compared toamean...
- Q Income($1000s) HouseholdSize AmountCharged ($)89.31 2.00 10985.4761.08 5.00 9792.9743.95 4.00 6527.5555.15 6.00 9708.5740.39 2.00 6335.2034.06 3.00 4809.5786.43 4.00 12314.5979.49 3.00 10823.3848.40 2.00 7172.0346.49 3.00 6996.3950.68 3.00 7349.2373.77 5.00 11719.6634.18 4.00 6062.7181.64...
- Q Question 6 (04 + 03 + 03 = 10 Marks) 6) What is sampling errorand why is it not present in a survey of a population? Stratifiedrandom sampling reflects Pareto’s...
- Q A coffee manufacturer is interested in whether the mean dailyconsumption of regular- coffee drinkers is less than that ofdecaffeinated coffee drinkers. Assume the population standarddeviation for those drinking regular coffee...
- Q Twoballs are drawn, without replacement, from a bag containing 11 redballs numbered 1-11 and 5 white balls numbered 12-16. (Enter yourprobabilities as fractions)(a) What is the probability that the second...
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