Statistics question and answers for July 20, 2023
- Q The IQ scores of children in a city are assumed to follow anormal distribution with unknown mean μ and known variance σ^2. Arandom sample IQ scores with a size of...
- Q QUESTION THREEYou are concerned about the possibility of experiencing onCoronavirus (COVID-19) during the next year. The probability of aCOVID-19 outbreak is 0.5%. Your local insurer offers to pay youK300, 000...
- Q Suppose that the mean cholesterol level for males aged 50 is241. An investigator wishes to examine whether cholesterol levelsare significantly reduced by modifying diet only slightly. A sampleof 12 patients...
- Q Given that x is a normal variable with mean μ= 49 and standard deviation σ = 6.9, find the followingprobabilities. (Round your answers to four decimal places.)(a)  P(x ≤ 60)(b)  P(x ≥...
- Q A marketing research professor is conducting a telephone surveyand needs to contact at least 160 wives, 140 husbands, 110 singleadult males, and 120 single adult females. It costs $2 to...
- Q The regression equation is Ŷ = 30 + 2.56X, the sample size is14, and the standard error of the slope is 0.97. What is thecritical value to test the significance...
- Q Determine the Average Run Length (ARL) of a x-bar chart withlimits where the process has shifted one standard deviation in onedirection
- Q please write 800 wordssummary or explain what you understand in this topics(HYPOTHESIS TEST ) ( STATING HYPOTHESIS )(A NULL HYPOTHESIS ) ( ALTERNATIVEHYPOTHESIS)(LEVEL OF SIGNIFICANCE) (P-VALUE or PROBABILITY OFVALUE)PLEASE explain...
- Q The following set of data shows how the advertising budgetaffects its sales (both in millions of dollars):Advertising. Sales12.51483.75521.63386099437.65416.18916.812641.2379Develop the equation of the simple regression line to predictsales from advertising expenditures...
- Q (1 point) An insurance company states that at least 86% of itsclaims are settled within 30 days. A consumer group selected arandom sample of 73 of the company's claims to...
- Q A series of 20 samples of size 4 has been drawn from a project.The measure of interest has an average of 20.0443, and the averagerange within the samples is 0.0567....
- Q Assuming that the population is normally​ distributed, constructa 95% confidence interval for the population​ mean, based on thefollowing sample size of n=6.​1, 2,​ 3, 4, 5​,and 15In the given​ data,...
- Q A marketing research professor is conducting a telephone surveyand needs to contact at least 160 wives, 140 husbands, 110 singleadult males, and 120 single adult females. It costs $2 to...
- Q This week we are learning about the Independent Samples T-Test(a.k.a., between-subjects research design), which tests for meandifferences between two independent groups. For this discussion,your task is to describe two examplesof...
- Q A marketing research professor is conducting a telephone surveyand needs to contact at least 160 wives, 140 husbands, 110 singleadult males, and 120 single adult females. It costs $2 to...
- Q Why would you use ANOVA when you could just run many sets oft-tests? [Think about practical considerations, as well asstatistical considerations.]
- Q Test the given claim. Identify the null​ hypothesis,alternative​ hypothesis, test​ statistic, P-value, and then statethe conclusion about the null​ hypothesis, as well as the finalconclusion that addresses the original claim....
- Q In the following exercises, assuming that the thermometerreadings are normally distributed, with a mean of 0 celsius and astandard deviation of 1.00 celsius. A thermometer is randomlyselected and tested. In...
- Q Write out the ANOVA shell (sources of variability & degreesof freedom) for each of the following experiments:(a) The 4 levels of one treatment variable (Trt) are assigned toEUs in a...
- Q From a box of fruit containing 75 oranges and 1 apple a randomsample of 2 pieces of fruit has been selected without replacement.Let X be the number of oranges and...
- Q (CO 5) The heights of 82 roller coasters have a mean of 280.7feet and a population standard deviation of 59.3 feet. Find thestandardized tests statistics and the corresponding p-value whenthe...
- Q From a box of fruit containing 37 oranges and 1 apple a randomsample of 2 pieces of fruit has been selected without replacement.Let X be the number of oranges and...
- Q A recent study about the blood types distribution reported thatthe percentage of B+ blood type holders in KSA is approximately19.7%. A call for donation for B+ blood is released at...
- Q 1. Compare and contrast the correlation and the chi-square testof independence. How are they similar and how are they different(i.e. when to use each) 2. Come up with two hypothetical...
- Q Suppose that the number of weekly traffic accidents occurring ina small town is Poisson random variable with parameter lamda =7.(a) what is the probability that at leat 4 accidents occur(until)...
- Q what is comparative experiment and what is being compare when acomparative experiment is perform?
- Q Sales personnel for Skillings Distributors submit weekly reportslisting the customer contacts made during the week. A sample of 68weekly reports showed a sample mean of 16.5 customer contacts perweek. The...
- Q If there are 1296 different ways that 4 (6 sided) dice can berolled, how many of the 1296 possibilities have less than 2 fivesrolled?
- Q alpha value is 0.05 if it is not specified in the problem.**Everything should be in r code base.4. Back to the iris dataset one last time! We wish to estimatethe...
- Q Hank would like to know how many customers are entering hispropane store within a given timeframe.  Prior dataindicate that on average 8 customers arrive in a given hour.a. Create the appropriate...
- Q What two z scores cut off the middle 95% of the normaldistribution?
- Q The table below gives the number of hours five randomly selectedstudents spent studying and their corresponding midterm examgrades. Using this data, consider the equation of the regressionline, yˆ=b0+b1xy^=b0+b1x, for predicting...
- Q In order to analyze water samples using a spectrophotometer orplate reader, it is necessary to turn the molecules of nitrate intoa dye molecule that can be quantified. The first step...
- Q Assume that a simple random sample has been selected and testthe given claim. Identify the null and alternative​ hypotheses,test​ statistic, P-value, and state the final conclusion thataddresses the original claim....
- Q A test for diabetes classifies 99% of people with the disease asdiabetic and 10% of those who don't have the disease as diabetic.It is known that 12% of the population...
- Q Suppose that in one region of the country, the mean amount ofcredit card debt per household in households having credit carddebt is $8,000, with standard deviation $1,000. Find theprobability that...
- Q The margin of error in a conï¬dence intervals does not accountfor all types of error.(a) What kind of error does the margin of error in a CI accountfor?(b) Give an...
- Q Question oneA researcher in a large supermarket wishes to study sicknessabsences among its employees. Theorganisation has branches in all the provinces, each branch keepsfull records of sickness leave. A random...
- Q Give descriptive statistics about the current COVID-19 crisis(Mean, Mode, Median, Variance, Correlation) with stating yoursources.
- Q The following data show the brand, price ($), and the overallscore for six stereo headphones that were tested by a certainmagazine. The overall score is based on sound quality andeffectiveness...
- Q Forty-minute workouts of one of the following activities threedays a week will lead to a loss of weight. The following sampledata show the number of calories burned during -minute workouts...
- Q 1. Suppose it is claimed that the typical adult travels anaverage distance of 16 miles to get to work each day. You believethis average is too low for Columbus residents....
- Q 2. Return to decision you made when answering part D of Question1.A. If the alpha level had been .01 (or 1%) rather than .05 (or5%), would your decision have been...
- Q Suppose the given country road has large defects which aredistributed along its length according to Poisson distribution withan average of 2 defects per mile. It takes the crew repairing thesedefects...
- Q Q: An agronomist wanted to estimate the meanweight of a certain fruit (?) in his farm. He selected a randomsample of size ? = 16, and found that the sample...
- Q In a lottery game a player chooses four digits (digits canrepeat, for instance 0, 2, 0, 2 is a valid choice) and bet $1 thatall four of them will arise...
- Q An automobile dealer conducted a test to determine if the timein minutes needed to complete a minor engine tune-up depends onwhether a computerized engine analyzer or an electronic analyzer isused....
- Q A population is normally distributed with mean ? and standarddeviation ?. Find the percentage of values which are between ?−2?and ?+2?.
- Q 1. Slot machines are the favorite game at casinos throughout theU.S. The following sample data show the number of women and numberof men who selected slot machines as their favorite...
- Q A survey is given to 300 random SCSU students to determine theiropinion of being a “Tobacco Free Campus.†Of the 300 studentssurveyed, 228 were in favor a tobacco free campus.Find...
- Q In November 2001, the Ag Globe Trotter newsletter reported that90% of adults drink milk. A regional farmer’s organization planninga new marketing campaign across its multicounty area polls a randomsample of...
- Q In a population of interest, we know that, 77% drink coffee, and23% drink tea. Assume that drinking coffee and tea are disjointevents in this population. We also know coffee drinkers...
- Q A shipment of 200 doses of an antibiotic has 7 defectivedoses.   i) What is the probability that the7th dose out of the shipment will be defective?  ii) If 5 doses...
- Q In randomized, double blind clinical trials of a newvaccine,Monkeys were randomly divided into two groups.Subjects ingroup x received the new vaccine while subject in group y receiveda control vaccine.After the...
- Q LINEAR ALGEBRAThe main topic studied is linear regression using matrices. Themain idea being that you use a projection of the vector onto thesubspace to find this linear regression equation.QUESTION: Explain...
- Q Three (3) companies supply the same part. All three companiesoperate in-control processes for the single quality characteristicof part-length. All three companies have a mean part-length equalto 17. The \"red company\"...
- Q THIS PROBLEM NEEDS TO BE SOLVED ONLY USING EXCELSOFTWARE!1. Use the following data set to answer the following:ewdbhe23.5e43.5e6.6e11.5e17.2e38.7e2.3e31.5e10.5e23.7e13.8e5.2e31.5e22.1e6.7e2.6e6.3e51.1e5.4e9e43e8.7e22.8e2.9e22.3e43.8e48.1e46.5e39.8e10.9w17.2w44.6w44.1w35.5w51w21.6w44.1w11.2w36w42.1w3.2w25.5w36.5w39w25.9w20.8w3.2w57.7w43.3w58w21.7w35.6w30.9w40.6w30.7w35.6w18.2w2.9w20.4w11.4- Make a back to back stemplot (usehttps://www.learner.org/courses/againstallodds/interactives/stemplots.htmlclick \"go\" under \"plot your data...
- Q A population with μ = 41 and σ = 4 is standardized to create anew distribution with μ =50 and σ = 10. In this transformation, ascore of X =...
- Q A marketing research firm wishes to compare the prices chargedby two supermarket chains—Miller’s and Albert’s. The research firm,using a standardized one-week shopping plan (grocery list), makesidentical purchases at 10 of...
- Q distinguish between the exponential distribution and the poissondistribution
- Q You are the manager of a restaurant that delivers pizza tocollege dormitory rooms. You have just changed your deliveryprocess in an effort to reduce the mean time between the order...
- Q A mail-order catalog firm designed a factorial experiment totest the effect of the size of a magazine advertisement and theadvertisement design on the number of catalog requests received(data in thousands)....
- Q A manufacturer of kitchen appliances is preparing to setthe price on a new blender. Demand is thought to depend on theprice and is represented by the modelD = 2,500 –...
- Q An operator walks from her workstation to a set ofshelves 10 steps away. She picks up both a hammer (weighs 2.5pounds) and a box of nails from the shelf(s), which...
- Q A beer industry association is interested in determining thepreference of workers for light, dark, and regular beers. A surveywas conducted in which 300 blue color workers and 300 white colorworkers,...
- Q 1) In a two-way ANOVA, what are main effects?2) In a two-way ANOVA, what are interaction effects?
- Q You are given:(iv) The claim frequency for a single insured follows a Poissondistribution with mean ?.(v) The claim frequency rate, ?, has a gamma distribution with mean1/10and variance 4/10000.(vi) During...
- Q A study by the U.S. Energy Information Administration found that25% of households have an income under $10, 000 of which 84.3% didnot own a dishwasher. However, it was found that...
- Q Find the most appropriate ARMA(p,q) model to the monthly averagewind speed data(from Jan 1984 to Mar 2020) and predict the nextnine numbers by using R. Your analysis shouldinclude stationarity checking,...
- Q Assume that the following pattern holds true through futuregenerations in a certain country: 60% of the daughters of workingwomen also work and 20% of the daughters of non–working women work.Find...
- Q An article investigated the consumption of caffeine among women.A sample of 43 women were asked to monitor their caffeine intakeover the course of one day. The mean amount of caffeine...
- Q The following regression model has been proposed to predictsales at a computer store.                          Y=60-2X1+30X2+10X3                          Where                          X1= competitor’s previous day’s sales(in $1,000s)                          X2=population within 1 mile (in1,000s)                          X3=1 if radio advertising was used; 0 if otherwiseWhat...
- Q Consider the following data on x = weight (pounds) andy = price ($) for 10 road-racing bikes.BrandWeightPrice ($)A17.82,100B16.16,250C14.98,370D15.96,200E17.24,000F13.18,500G16.26,000H17.12,580I17.63,500J14.18,000These data provided the estimated regression equationŷ = 28,243 − 1,418x.For these data,...
- Q Data for a sample of 30 apartments in a particular neighborhoodare provided in the worksheet. You want to see if there is a directrelationship between Size of the Apartment and...
- Q 2. Solve the following linear program using the graphicalsolution procedure:Max 8A + 5B s.t.i. 1A ≤ 120ii. 1B ≤ 150iii. 2A + 4B ≤ 700 iv. A, B ≥ 0
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