Basic Math question and answers for September 24, 2023
- Q In the description of the statistical models that relate onevariable to the other we used terms that suggest a causalityrelation. One variable was called the "explanatory variable" andthe other was...
- Q IN EXCEL Q1 The Krampf Lines Railway Company specializes incoal handling. On Friday, April 13, Krampf had empty cars at thefollowing towns in the quantities indicated:TOWNSUPPLY OF CARSMorgantown35Youngstown60Pittsburgh25By Monday, April...
- Q A manufacturer of golf equipment wishes to estimate the numberof left-handed golfers. How large a sample is needed in order to be99% confident that the sample proportion will not differ...
- Q A magazine uses a survey of readers to obtain customersatisfaction ratings for the nation's largest retailers. Eachsurvey respondent is asked to rate a specified retailer in terms ofsix factors: quality...
- Q A newspaper reports that the average expenditure on Valentine'sDay is $100.89. Do male and female consumers differ in the amountsthey spend? The average expenditure in a sample survey of 40...
- Q Consider the following data for two independent random samplestaken from two normal populations.Sample 111613798Sample 2879459(a)Compute the two sample means.Sample 1Sample 2(b)Compute the two sample standard deviations. (Round your answersto two...
- Q 1-Television viewers often express doubts about the validity ofcertain commercials. In an attempt to answer their critics, a largeadvertiser wants to estimate the true proportion of consumers whobelieve what is...
- Q A distributor of computer parts purchases a specific componentfrom a supplier in lots of 1000 units. The cost of purchasing a lotis $30,000. The supplier is known to supply imperfect...
- Q A group of psychiatrists want to investigate if there is anydifference in depression levels (measured on a scale from [0=not atall depressed] to [100=severely depressed]) in patients who havebeen treated...
- Q 1.Suppose a researcher is interested in carrying out a phase IIclinical trial in order to assess the effectiveness of fourdifferent doses of an investigational new drug. Assume thefollowing table represents...
- Q TireSteeringTread WearBuy AgainGoodyear Assurance TripleTred8.98.58.1Michelin HydroEdge8.998.3Michelin Harmony8.38.88.2Dunlop SP 608.28.57.9Goodyear Assurance ComforTred7.97.77.1Yokohama Y3728.48.28.9Yokohama Aegis LS47.977.1Kumho Power Star 7587.97.98.3Goodyear Assurance7.65.84.5Hankook H4067.86.86.2Michelin Energy LX47.45.74.8Michelin MX476.55.3Michelin Symmetry6.95.74.2Kumho 7227.26.65Dunlop SP 40 A/S6.24.23.4Bridgestone Insignia SE2005.75.53.6Goodyear Integrity5.75.42.9Dunlop...
- Q Socially conscious investors screen out stocks of alcohol andtobacco makers, firms with poor environmental records, andcompanies with poor labor practices. Some examples of "good,"socially conscious companies are Johnson and Johnson,...
- Q You wish to test the following claim ( H a ) at a significancelevel of ? = 0.01 . H o : ? = 64.6 H a : ? <...
- Q Kolkmeyer Manufacturing Company is considering adding twomachines to its manufacturing operation. This addition will bringthe number of machines to ten. The president of Kolkmeyer asked fora study of the need...
- Q (A) Suppose two coin are tossed, determine the sample space andfind two sigma field over the sample. (B) From the experiment alsogive example of a set that is not a...
- Q In a simple random sample of 100 households, the sample meannumber of personal computers was 1.32. Assume the populationstandard deviation is 0.41. Construct a 95% confidence interval forthe mean number...
- Q Provided below are summary statistics for independent simplerandom samples from two populations. Use the pooled? t-test and thepooled? t-interval procedure to conduct the required hypothesistest and obtain the specified confidence...
- Q 18. With statistical power of 95%, the researcher knowsthat in general(a) the chance that the alternative hypothesis is true is 95%(b) the P-value for the study will be 5%(c) the...
- Q The IMF is an international organization of 189-member countriesthat, among other things, looks to assist nations that can’t paytheir international debt obligations.Assume that a financial analyst for the IMF was...
- Q A poll was taken this year asking college students if theyconsidered themselves overweight. A similar poll was taken 5 yearsago. Five years ago, a sample of 270 students showed that...
- Q Q: A computer consulting firm presently hasbids out on three projects. Let Ai ={awarded project i}, for i = 1, 2, 3, and supposethat P(A1) = 0.23,P(A2) = 0.25,P(A3) =...
- Q What is the correlation between the number of calories consumedand BMI?What is the slope coefficient for the linear relationshipbetween the number of calories consumed and BMI, assuming thatcaloric intake is...
- Q A travel magazine conducts an annual survey where readers ratetheir favorite cruise ship. Ships are rated on a 10 point scale,with higher values indicating better service. A sample of 55...
- Q Find a study that uses linear regression and a line of best fit.What is the Correlation Coefficient? What conclusions can you makeabout the data? Is there a correlation and how...
- Q A population of values has a normal distribution with ? = 127.5and ? = 96.9 . You intend to draw a random sample of size n = 150.Find the probability...
- Q A researcher would like to know whether there is a significantrelationship between Verbal skills and Math skills in population ofhigh school students. A sample of n = 200 students israndomly...
- Q Why does the correlation coefficient of a predictor increasewhen we remove a relevant predictor in a multilinear regression?For example, if we are regressing income on education, gpa, andcollege rank and...
- Q A) If sample data are such that the null hypothesis is rejectedat the alpha=5% level of significance based upon a 2 tailed test,is Ho also rejected at the alpha=1% level...
- Q It is thought that the mean length of trout in lakes in acertain region is 20 inches. A sample of 46 trout from oneparticular lake had a sample mean of...
- Q 1 In a research report from an experiment, the term astatistically significant difference is used to indicate____________ .A. that the there is a very low probability (i.e., 5% or less)the...
- Q For each of the following exercises 1 to 4: For eachtest use either the critical value or the P-value method you arenot required to use both.State the claim and the...
- Q You wish to test the following claim (HaHa) at a significancelevel of ?=0.05?=0.05. For the context of this problem, one dataset represents a pre-test and the other data set represents...
- Q The types of raw materials used to construct stone tools foundat an archaeological site are shown below. A random sample of 1486stone tools were obtained from a current excavation site....
- Q A market researcher believes that brand perception of one of thecompany's products may vary between different groups. Afterinterviewing 401persons, the following data was compiled. Can weconclude that brand perception is...
- Q Is the magnitude of an earthquake related to the depth below thesurface at which the quake occurs? Let x be the magnitude of anearthquake (on the Richter scale), and let...
- Q Colleen is the marketing manager for Virtually Viral, anentertainment company that collects viral videos from around theInternet and aggregates them on their website. Whether it’s videosof cats or unusual marriage...
- Q I have to answer these questions in a way that I can write outin a word document. Previous answer make little sense. I need tointerpret (A) and I am just...
- Q A survey of 23 grocery stores revealed that the average price ofa gallon of milk was $3.11 with a standard error of $0.30. What isthe 95% confidence interval to estimate...
- Q The proportion of public accountants who have changed companieswithin the last three years is to be estimated within 5%. The 99%level of confidence is to be used. A study conducted...
- Q A physical therapist claims that one? 600-milligram dose ofVitamin C will increase muscular endurance. The table availablebelow shows the numbers of repetitions 1515 males made on a handdynamometer? (measures grip?...
- Q Gas Heated HomesCentral ElectricHeat Pump867886847883828780867292826389At ?= .05, test to see if there is a significant differenceamong the average bills of all the homes (in a city) using threeforms of heating....
- Q Clearly explain what it means for a set of events to form apartition of a sample space.Give an example of a random experiment which has a sample spacefor which you...
- Q A laboratory technician claims that on average it takes her nomore than 7.5 minutes to perform a certain task. A random sample of20 times she performed this task was selected...
- Q Step 1: Identify and Solve a TypicalProblemThere are a number of typical models in the Operations Researchfield which can be applied to a wide range of supply chainproblems. Select one...
- Q Consider the following proposed relationships between anindependent and a dependent variable. In each case, would it berealistic for a researcher to perform an experiment to test thetheory? If yes, briefly...
- Q A sociologist was hired by a large city hospital to investigatethe relationship between the number of unauthorized days thatemployees are absent per year and the distance (miles) between homeand work...
- 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 being used on...
- Q A box in a supply room contains 15 compat fluorscent lightbulbs,of wich 5 are rated 13 watt, 6 are rated 18 watt, and 4 are rated23 watt. Suppose that three...
- Q Post a situation in which it might be interesting to know whether adifference in variances exists. Why would it be important to knowif a difference exists. What actions might result...
- Q "Durable press" cotton fabrics are treated to improve theirrecovery from wrinkles after washing. Unfortunately, the treatmentalso reduces the strength of the fabric. The breaking strength ofuntreated fabric is normally distributed...
- Q Win/Loss and With/Without Joe: Joe playsbasketball for the Wildcats and missed some of the season due to aninjury. The win/loss record with and without Joe is summarized inthe contingency table...
- Q Changes in Education Attainment: According tothe U.S. Census Bureau, the distribution of Highest EducationAttainment in U.S. adults aged 25 - 34 in the year 2005 isgiven in the table below.Census:...
- Q Before calculating a correlation coefficient, explain why youwould create and examine a scatterplot of the relationship. In yourresponse, please discuss (a) linearity (b) homoscedasticity, (c)restriction of range, and (d) the...
- Q the data set shown? below, complete parts? (a) through? (d)below. x 3 4 5 7 8 y 5 7 6 12 13 ?(a)??Find the estimates of beta 0and beta 1....
- Q An insurance agent randomly selected 10 of his clients andchecked online price quotes for their policies. His summaries ofthe data are? shown, where Diff is Local minus?Online.Variable Count Mean StdDevLocal...
- Q Question 1 In the Payne County medical center,a surgical director selected a random sample of 37 nurses and foundthat the mean of their ages was 39.40. The sample standarddeviation for...
- Q A random sample of thirty-six 200-meter swims has a mean time of3.009 minutes. The population standard deviation is 0.080 minutes.A 90?% confidence interval for the population mean time is(2.987,3.031).Construct a...
- Q As a quality control? manager, you are responsible for checkingthe quality level of AC adapters for tablet PCs that your companymanufactures. You must reject a shipment if you find 5...
- Q You wish to test the following claim ( H a ) at a significancelevel of ? = 0.05 . H o : ? = 65.3 H a : ? ?...
- Q Tudor brand car batteries are sold with the claim that theywill last for at least 4 years. Weibang, having boosted his car(with a 3.5-year-old Tudor battery) many times this past...
- Q Your company's new portable phone/music player/PDA/bottlewasher, the RunMan, will compete against the established marketleader, the iNod, in a saturated market. (Thus, for each device yousell, one fewer iNod is sold.)...
- Q During the first quarter of 2015, Toronto Dominion Bank (TD)stock cost $45 per share, was expected to yield 4% per year individends, and had a risk index of 3.0 per...
- Q Measuring the height of a California redwood tree is verydifficult because these trees grow to heights of over 300 feet.People familiar with these trees understand that the height of aCalifornia...
- Q For this problem, carry at least four digits after the decimalin your calculations. Answers may vary slightly due torounding.In a random sample of 65 professional actors, it was found that...
- Q In a recent Super Bowl, a TV network predicted that 87 % of theaudience would express an interest in seeing one of its forthcomingtelevision shows. The network ran commercials for...
- Q 1. A variable is normally distributed in the population with amean of 100 and a standard deviation of 10. A sample of 20 israndomly selected. The probability that the sample...
- Q Conduct a one way between subjects’ ANOVA using SPSSStudents were randomly assigned to attend an ANOVA lecture thatcontains one of the following approaches to instructions. 1)Mathematical, 2) Conceptual, 3) Conceptual...
- Q A criminologist is interested in the effects of unemployment andpolicing on murder and has run the following multipleregression:Summary OutputRegression StatisticsMultiple R0.90303R Square0.815462Adjusted R Square0.762737Standard Error5.11041Observations10CoefficientsStandard Errort StatisticP-valueIntercept–23.263095887.075518018–3.287830.013342Unemployment rate10.277543262.1728599374.7299610.002133Police per 100,000–0.0467371010.023409765–1.996480.086065a....
- Q What statistical test is most appropriate if you want toexamine whether there is a difference in graduation rates(percentages) between public and private high schools in your stateof residence? Assume the...
- Q Dr. Mack Lemore, an expert in consumer behavior, wants toestimate the average amount of money that people spend in thriftshops. He takes a small sample of 8 individuals and asks...
- Q As concrete? cures, it gains strength. The following datarepresent the? 7-day and? 28-day strength in pounds per squareinch? (psi) of a certain type of concrete. Complete parts? (a)through? (f) below....
- Q 1. Out of500 people sampled, 140 received flu vaccinations this year. Basedon this, construct a 95% confidence interval for the truepopulation proportion of people who received flu vaccinations thisyear.Give your...
- Q Consider the following table:SourceSSDFMSTest StatisticRegression?7 1.38Error4834.32 Total8718.219Copy DataCalculate the Sum of Squared Regression. Round your answer totwo decimal places, if necessary.Calculate the Degrees of Freedom among Regression.Calculate the Mean Squared Regression. Round...
- Q The accompanying data on degree of spirituality for a sample ofnatural scientists and a sample of social scientists working atresearch universities appeared in a paper. Assume that it isreasonable to...
- Q The authors of a paper concerned about racial stereotypes intelevision counted the number of times that characters of differentethnicities appeared in commercials aired on a certain city'stelevision stations, resulting in...
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