Statistics question and answers for August 01, 2023
- Q 1.When the value of the standard deviation increases, the valueof the z score will generally tend toa. increaseb. decrease2. In a standard normal distribution, what z-scorecorresponds to the 75th percentile?a....
- Q what would the effect be of a one-tailed test and theprobability of rejecting the null hypothesis?
- Q Company ABCCompany XYZ18,4228072718,1172209123,2597138318,0323650624,4726750811,7018158216,4312594428,634924624,2884341920,0197019328,9475527221,4380589223,9963499725,7799184121,2404104917,6172773613,0378846823,1714193922,4840740119,4482834611,7543784816,4767880625,3291053127,0774376628,2929348122,6018824418,0751097221,7540571718,5264487417,6949766327,38769217,8512619231,3302151126,1062451117,5431167121,06149419,6030812820,3861259824,1395544523,383860322,9102154827,9099663724,9366401615,9847741617,3990936815,1603513223,6640478921,7866341326,3362160825,2104269334,5275073525,7243141828,4731921222,3647430720,5372937821,0548490121,2908192320,5482547714,7120143216,4944208824,4756695915,6403939914,2837923818,3844020312,4088872423,2546495318,9343639318,2691122129,4778199618,6414934522,6865411725,7074089522,5163110520,8521445824,0390916723,9377019931,7630072617,9601177628,3827428717,6542478727,2800260222,8364577323,306207215,5856476425,0322121320,2403392126,4188618618,33414518A large consumer electronics retailer is planning to expand itse-commerce operations. To this end, the management is consideringestablishing a strategic partnership with courier company XYZ forthe delivery of...
- Q Mean 55.533796Std Dev 4.5528105Std Err Mean 1.0180394Upper 95% Mean 57.664577Lower 95% Mean 53.403015N 20t Test Test Statistic Prob > t 0.9170Answer the following questions by filling in the blanks for...
- Q A simple random sample of size n equals 18 is drawn from apopulation that is normally distributed. The sample mean is foundto be x overbar equals 62 and the sample...
- Q Answer the following questions in the space provided in your ownwords. 1. A Bureau of Labor Statistics (BLS) economist conducts astatistical study to test his hunch that in households with...
- Q Run a regression analysis on the following bivariate set of datawith y as the response variable.xy58.656.366.372.154.8119.257.483.262.874.377.672.271.862.246.477.277.486.660.578.466.4131.376.4113.568.584.281.510277.5136.34912.2Verify that the correlation is significant at an α=0.05. If thecorrelation is indeed significant, predict...
- Q An analysis is interested in testing whether four populationhave equal means. The following sample data have been collectedfrom population that are assumed to be normally distributed withequal variance:S1S2S3S49128176168151116121714127161491013You should use...
- Q A regression model to predict Y, the state-by-state2005 burglary crime rate per 100,000 people, used the followingfour state predictors: X1 = median age in 2005,X2 = number of 2005 bankruptcies...
- Q On December 17, 2007 baseball writer John Hickeywrote  an article for the Seattle P-I about increases toticket prices for Seattle Mariners games during the 2008 season.The article included a data set...
- Q Why do we use adjusted R2 instead of R2 invariable selection? Why do we not always choose the model with thehighest adjusted R2?
- Q Why do we use residuals (instead of the data) to check theassumptions in an experimental design?
- Q Maintenance of ProductionFacilityA production facility has several 3-D printing machines whichneed maintenance for two reasons. Maintenance type A: a sensor mayhave detected a fault, e.g. an oil leak. Maintenance type...
- Q A study of 45 pregnant women with more than 12 years ofeducation were asked to predict the sex of their babies, and 32 ofthem made correct predictions. Use these results...
- Q Depressed patients were randomly assigned to one of threegroups: a placebo group, a group that received a moderate dose ofthe drug, and a group that received a high dose of...
- Q Assume that 37% of Canadians feel they will have to cut back onspending, and that a random sample of 100 Canadians isselected.What is the probability that more than 70 Canadians...
- Q Toys Insane Inc. produces two goods: Glibber Gems (G) andBlubber Bricks (B). In order to produce Glibber Gems and BlubberBricks, three input factors are necessary: Slime (S), Tran (T), andGorilla...
- Q Toys Insane Inc. produces two goods: Glibber Gems (G) andBlubber Bricks (B). In order to produce Glibber Gems and BlubberBricks, three input factors are necessary: Slime (S), Tran (T), andGorilla...
- Q Toys Insane Inc. produces two goods: Glibber Gems (G) andBlubber Bricks (B). In order to produce Glibber Gems and BlubberBricks, three input factors are necessary: Slime (S), Tran (T), andGorilla...
- Q This data gives the square footage and sales prices for severalhouses and sales prices for several houses in Dallas, Texas.Square FootageValue2000238139.422002597122400300953.73000369965.73200340091.336004054252900345131You plan to build a 500-sqaure-foot addition to your house....
- Q The following data are provided. (Nonlinear regression usingexcel) x 1 2 3 4 5 y 2.2 2.8 3.6 4.5 5.5 Fit the model y=a+bx+c/x,where a, b and c are constants...
- Q It is possible to compare multiple means with a single set ofhypotheses (one null and one alternatehypothesis).   In hypothesis testing, the goal is to accept the nullhypothesis.Point estimates are known for...
- Q Toys Insane Inc. produces two goods: Glibber Gems (G) andBlubber Bricks (B). In order to produce Glibber Gems and BlubberBricks, three input factors are necessary: Slime (S), Tran (T), andGorilla...
- Q Daily commute time is normally distributed with mean=40 minutesand standard deviation=8 minutes. For 16 days of travel, what isthe probability of an average commute time greater than 35? B. Acup...
- Q Toys Insane Inc. produces two goods: Glibber Gems (G) andBlubber Bricks (B). In order to produce Glibber Gems and BlubberBricks, three input factors are necessary: Slime (S), Tran (T), andGorilla...
- Q Describe how to conduct an f-test to analyze a dataset (Stepsare fine in this case)
- Q Consider the data set below of the 14†pizzas at Little Italy.There are two pizza chefs (Anna and Lorenzo, Factor A), two workshifts (day and evening, Factor B), and two...
- Q Assume that the traffic to the web site of Smiley’s People,Inc., which sells customized T-shirts, follows a normaldistribution, with a mean of 4.56 million visitors per day and astandard deviation...
- Q Use the given information to find the number of degrees of​freedom, the critical valueschi Subscript Upper L Superscript χ2Landchi Subscript Upper R Superscript χ2R​,and the confidence interval estimate ofsigmaσ.It is...
- Q A random sample of 64 students at a university showed an averageage of 20 years and a sample standard deviation of 4 years. The 90%confidence interval for the true average...
- Q A survey of 170 commuters shows that on average people travel17.4 km with standard deviation 8.4 km. Find 99% confidenceinterval for the population mean commuting distance. State yourconclusion.
- Q Saeko owns a yarn shop and want to expands her colorselection.Beforeshe expands her colors, she wants to find out if her customersprefer one brandoveranother brand. Specifically, she is interested in...
- Q Question 8Hypothesis Test - TerminologyMatch terms to descriptions Question 8 options:a) The hypothesis expressing a claim involving one of =, ≤ (atmost), or ≥ (at least) and requiring no (null)...
- Q What is the minimal sample size needed for a 95% confidenceinterval to have a maximal margin of error of 0.1 in the followingscenarios? (Round your answers up the nearest whole...
- Q Before the furniture store began its ad campaign, it averaged193 customers per day. The manager is investigating if the averageis smaller since the ad came out. The data for the...
- Q 17) Not everyone pays the same price for the same model of acar. For a particular new car the mean price is $18,750 with astandard deviation of $690.  ROUND VALUES...
- Q MK 332 Homework April 1, 2020Q2. A company wants to know how long newlyhired MBAs remain on their first jobs. A sample of 17 MBAs has anaverage of 3 years,...
- Q 15% of all Americans suffer from sleep apnea. A researchersuspects that a higher percentage of those who live in the innercity have sleep apnea. Of the 315 people from the...
- Q A team of researchers would like to find out if Country Xresidents, who favor a low fat diet, have significantly lowercholesterol levels compared to that of the US population. Theycollected...
- Q Instructions:Show all work, including every calculation and everyformula, with proper symbols. Formulas must be those used in therequired textbook for the course.Use the t-table in your book to find the...
- Q TV sets: According to the Nielsen Company, the mean number of TVsets in a U.S. household in 2013 was 2.24 . Assume the standarddeviation is 1.2 . A sample of...
- Q Inthe Knaster procedure, why is it important that the bids be sealed?Do the bids have to be sealed in the adjusted winner procedure?Explain your answer.
- Q Suppose that you are the manager of a casino and you collectdata on one of your roulette tables. You find that among the last10,000 bets, there were only 350 bets...
- Q PTC is a substance that has a strong bitter taste for somepeople and is tasteless for others. The ability to taste PTC isinherited and depends on a single gene that...
- Q Studies have shown that the frequency with which shoppers browseInternet retailers is related to the frequency with which theyactually purchase products and/or services online. The followingdata show respondents age and...
- Q Two sample Independent t-testYou want to test your hypothesis below:There is a difference in developingskills by practice methods: Distributed practice vs. Massedpractice.           Provide your answers in the template below the data...
- Q You want to test your hypothesis below:There is a difference in mean testscores between two classes: Class 1 vs. Class 2Â Â Â Â Â Â Â Â Â Â Â Provide your answers in the template below the data set.class...
- Q For the record, this is a homework question, not a testquestion. Why is the t-distribution sometimes used when calculatinga confidence interval? b) (2 points) In general, is the =t.invvalue larger...
- Q Suppose a group of 700 smokers (who all wanted to give upsmoking) were randomly assigned to receive an antidepressant drugor a placebo for six weeks. Of the 164 patients who...
- Q Hypothesis test of one mean1. A random sample of eight students participated in apsychological test of depth perception. Two markers, one labeled Aand the other B, were arranged at a...
- Q Thank you in advance, i'm not so good with this subject so couldyou include the steps you did please1. The gross weekly sales at a certain super market are aGaussian...
- Q An industrial sewing machine uses ball bearings that aretargeted to have a diameter of 0.73 inch. The lower and upperspecification limits under which the ball bearing can operate are0.715 inch​...
- Q Write the null and alternative hypotheses for each of thefollowing examples. Determine if each is a case of a two-tailed, aleft-tailed, or a right-tailed test. (a) To test if the...
- Q A television CEObelieves viewership of the evening news does not depend on age. Shecollects a random sample of 2000 television viewers across fourdifferent age groups and asks whether or not...
- Q Unoccupied seats on flights cause airlines to lose revenue.Suppose a large airline wants to determine of the mean number ofunoccupied seats on all its flights is greater than 10. Toaccomplish...
- Q For a standardized normal​ distribution, determine a​ value, sayz0​, such that the following probabilities are satisfied.a. ​P(0less thanzless thanz0​)equals0.4641b. ​P(minusz0less than or equalszless than​0)equals0.34c. ​P(minusz0less than or equalszless than orequalsz0​)equals0.91d....
- Q Sara is a big hip-hop music fan. Her friend Matt is a big rapmusic fan. They each have a huge library of songs in their digitalmusic libraries. They each randomly...
- Q 1) Researchers in South Africa were interested in prevalence ofHIV-related behaviors and infection in the population. Theyadministered a survey of 500 men and women who came for health careat a...
- Q A study was conducted to see whether two types of cars, A and B,took the same time to parallel park. Seven drivers were randomlyobtained and the time required for each...
- Q Ina recent election, 36% of registered voters actually voted.Assuming the population proportion of voters is 36%, find theprobability that in a random sample of 75 people less than 40% willvote....
- Q JOBCO produces two products on two machines. A unit of product 1requires 2 hours on machine 1 and 1 hour on machine 2. For product2, a unit requires 1 hour...
- Q In a randomly selected sample of 500 registered voters in acommunity, 120 individuals say that they plan to vote for CandidateY in the upcoming election.(a) Find the sample proportion planning...
- Q The number of robocalls received by a given household in twelverandomly selected weeks results in the following data set: {9, 7,2, 9, 4, 8, 4, 10, 15, 10, 20, 8}....
- Q A subject is presented with three cups, two of which contain thesame brand of cola and one of which contains a different brand. Thesubject is to identify which one of...
- Q What is the optimal time for a scuba diver to be on the bottomof the ocean? That depends on the depth of the dive. The U.S. Navyhas done a lot...
- Q Right after the poll stations are closed at 17:00, a politicalcandidate receives theinformation that out of the 50 people interviewed her approval“count†is 24. As a statisticslover, she immediately tests...
- Q A sample is selected to find a 90% confidence interval for theaverage starting salary. Here are the sample statistics: n = 31, x̄ = $43, 780, s = $1, 600.a)....
- Q Health researchers believe that theneonatal mortality rate is higher at home (MRH) than that in thehealth centers (MRC). The neonatal mortality rates (both MRH andMRC) for 20 countries are recorded...
- Q 3. Suppose that you are working for a watch company studying theaverage wrist sizes of people in the population of the UnitedStates.(a) If you are told that we know from...
- Q A service station owner believes that an equal number ofcustomers prefer to buy gasoline on every day of the week. Amanager at the service station disagrees with the owner and...
- Q Calculate the test statistic, x^(2), for a chi-squared test forassociation using the following table.The following data represents the observed values and expectedvalues of the eating habits of runners and swimmers...
- Q 17) On this worksheet, make an XY scatter plot linked to thefollowing data:XY922287231022380259127100209521109197728100221982589279723932289279122972110521882283248627892679308822942418) Add trendline, regression equation and r squared to theplot.Add this title. (\"Scatterplot of X and Y Data\")19)The...
- Q A manufacturer of automobile batteries claim that at least 80%of the batteriesthat it produces will last 36 months. A consumers’ advocate groupwants to evaluate thislongevity claim and selects a random...
- Q Urban traffic congestion throughout the world has beenincreasing in recent​ years, especially in developing countries.The accompanying table shows the number of minutes that randomlyselected drivers spend stuck in traffic in...
- Q I am very confused about how to find the critical value of thetest statistic.I have found the test statistic of 5.636, with 1% significancelevel and two degrees of freedom. How...
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