Basic Math question and answers for August 28, 2023
- Q Use the sample information x⎯⎯x = 36, σ = 7, n = 16 tocalculate the following confidence intervals for μassuming the sample is from a normal population.(a) 90 percent confidence....
- Q Using chi-square, test the null hypothesis that the prevalenceof serious mental illness does not differ by type of substanceabuse.A sample of 118 college students is asked whether they areinvolved in...
- Q Consider two independent random samples with the followingresults:n1=532x1=390   n2=730x2=139Use this data to find the 90% confidence interval for the truedifference between the population proportions.Step 1 of 3: Find the point estimate...
- Q An internet search engine looks for a certain keyword in asequence of independent websites. It is believed that 35% of thesites contain this keyword.(a) Let X be the number of...
- Q 1-Orders come to a warehouse facility with an exponentiallydistributed interarrival time of 20 minutes. What is theprobability of having no orders during a given hour period?
- Q Assuming, I'm correct that sex and yes/no questions are nominaldata, then the best source of testing from my reading and researchis mode. However in my question/answers, the only options are...
- Q Dihybrid crosses involving plants with either white or yellowflower and either tall or short morphs were done. The yellow alleleis dominant over the while allele, and the tall allele is...
- Q The SAT is the most widely used college admission exam. (Mostcommunity colleges do not require students to take this exam.) Themean SAT math score varies by state and by year,...
- Q DATAfile: CorporateBondsYou may need to use the appropriate appendix table or technologyto answer this question.A sample containing years to maturity and yield for 40 corporatebonds are contained in the data...
- Q Use the weights of cans of generic soda as sample​ one, and usethe weights of cans of the diet version of that soda as sample two.Assume that the two samples...
- Q One late Friday afternoon your obnoxious boss comes into youroffice as you are about to leave, and shows you 26 observationsthat he believes to be related. Y, he believes, is...
- Q Consider the sample space of all people living in the UnitedStates, and within that sample space, the following two events.??=people who are college graduates=people who areunemployedA=people who are college graduatesB=people...
- Q In a random sample of 32 criminals convicted of a certain​crime, it was determined that the mean length of sentencing was 61​months, with a standard deviation of 12 months. Construct...
- Q Below are monthly rents paid by 30 students who live off campus.700 700 700 900 670 540 660 1,000 710 590 690 625 530 710 620 630820 885 570 590...
- Q A. Define the following terms:                 -Correlation                 -Causation                 B. How do we know when 2 variables are correlated?                 C. Explain the following: “Correlation does not equalCausationâ€Â                 D. What requirements must be met to satisfy Causation?
- Q A health psychologist conducted an experiment in whichparticipants watched a film that either did or did not include aperson being injured because of not wearing a seatbelt. A weeklater, as...
- Q Ch.8 #5Consider the following time series data.QuarterYear 1Year 2Year 314672236335645781)Â Â Use a multiple regression model with dummyvariables as follows to develop an equation to account for seasonaleffects in the data. Qtr1...
- Q 1. Parkruns are free 5km timed runs usually run on weekends indifferent cities, towns and suburbs around the world. It issuspected that they are competitive and hence faster than 5kmfamily...
- Q A process used in filling bottles with soft drink results in netweights that are normally distributed, with a mean of 2 liters anda standard deviation of 0.05 liter. Bottles filled...
- Q The Table in my homework question below is completely wrong. Iam not sure where I went wrong in my calculations but coud yourework this question and answer the parts below??Here...
- Q 1. The waiting times​ (in minutes) of a random sample of 21people at a bank have a sample standard deviation of 3.5 minutes.Construct a confidence interval for the population variance...
- Q Assume that we want to construct a confidence interval. Do oneof the​ following, as​ appropriate: (a) find the critical valuetα/2​, ​(b) find the critical value zα/2​, or​ (c) state thatneither...
- Q Pls answer all three parts for UPVOTEData set:Students Outside USStu IDAgeGPAHrs spend on sch wrk3484.0076472.79149453.48512194.003015243.101018343.242214436.00624192.85727192.801030273.40833282.901636273.40839282.901642212.9445202.50648233.31851413.80754212.60265739560183.101263283.70206635869372.8067221N/A2175203.00478303.50681213.1484213.20387372.86390193.3012Students in US:Stu IDAgeGPAHrs spend on sch wrk175203.2010178202.4012181173.986184203.0015187272.206190193.0071933.1015196206199433.6712202443.8010205263.804208252.505211213.7210214292.544217333.8521220183.005223213.006226193.005229263.004232192.814235193.006238283.5010241194.0012244203.202247219250202.513253203.205256232259203.1027262262.508a) Construct a 5-number summary and boxplot using the...
- Q Historically, the time needed for college students to completetheir degree follows a normal distribution with a mean of 4 yearsand a standard deviation of 1.2 years. You wish to see...
- Q The Pew Research Center Internet Project conducted a survey of657 Internet users. This survey provided a variety of statistics onthem. If required, round your answers to four decimal places.(a) The...
- Q Pick a profession, identify events that might affect thevariation ( you must include all three ; cyclical, seasonal andirregular ) of the secular trend. List at least three ways thatthis...
- Q Cultivated amaranth grains (Amaranthus caudatus) come in threecolors: black, brown, and pale. Geneticists asked whether thisphenotype could result from a dominant epistatic control. Crossingblack-seeded and pale-seeded A. caudatus populations (homozygouslines)...
- Q Let x be a normal random variable with mean 35 andstandard deviation 2.a. Find P(30 < x < 38)..9270b. Find P(x > 34)..6915c. Find P(x = 36).0d. Find the area...
- Q Review the steps involved in a statistical hypothesis test. Howdo we set up the null and alternative hypotheses?How do we set the level of significance?Can you think of a business...
- Q Assume that when adults with smartphones are randomly selected,39% use them in meetings or classes. If 5 adults smartphone usersare randomly selected, find the probability that exactly 2 of themuse...
- Q 6. Imagine that a soda bottling machine fills 550 ml bottleswith a standard deviation of 7 ml. If we took 100 sample bottles,estimate how many bottles would meet the quality...
- Q sampling, variables, hypothesis testing, z scores, and standarddeviation
- Q Thirty percent of all customers who enter a store will make apurchase. Suppose 10 customers enter the store, and that they makeindependent purchasing decisions.(a) Let X be the number, out...
- Q Is there enough evidence to conclude that the average salary atthe Company A is LESS than the average salary at the Company B ( α= 0.04)?Average SalaryCompany ACompany B$58,000$47,000$59,000$74,000$60,000$56,000$73,000$55,000$63,000$65,000$62,000$52,000$59,000$68,000$55,000$63,000$61,000$66,000$60,000$66,000$54,000$57,000$66,000$59,000$61,000$58,000$48,000$63,000$61,000$66,000$60,000$62,000$54,000$62,000$67,000$53,000$63,000$46,000$53,000$54,000$55,000$65,000$52,000$61,000$49,000$72,000$56,000$45,000$59,000$70,000$61,000$59,000$53,000$67,000$50,000$65,000$61,000$63,000$53,000$63,000$58,000$65,000$64,000$68,000$58,000$56,000$52,000$57,000$59,000$73,000$57,000$70,000$52,000$62,000$52,000$57,000$62,000$64,000$67,000$70,000$56,000$55,000$61,000$61,000$60,000$55,000
- Q a politician claims that the mean salary for managersin his State is more than the national mean, $82,000.00. Assume thepopulation is normally distributed and the population deviation is$9500.00. The salaries(in...
- Q The lengths of pregnancies in a small rural village are normallydistributed with a mean of 270 days and a standard deviation of 15days.In what range would you expect to find...
- Q People have been using Cameras for private daily use since the1880s and the first Kodak camera cost a lot of money in those days.Today we wish to see if the...
- Q The Zagat Restaurant Survey provides food, decor, and serviceratings for some of the top restaurants across the United States.For 21 restaurants located in a certain city, the average price ofa...
- Q Use the sample data and confidence level given below to completeparts​ (a) through​ (d). A research institute poll askedrespondents if they felt vulnerable to identity theft. In the​poll, n equals...
- Q Determine the 95% confidence interval for the following scores:83, 92, 81, 87, 79, 93, 88, 87, 83. Hint: You will need todetermine the sample mean and standard deviation and then...
- Q Let Z be a normal random variable with mean µ = 0 and standarddeviation σ = 1, that is, Z ∼ N(0, 1). Find each of thefollowing:(a) P(Z ≤ −1.13).(b)...
- Q You and your spouse each take two gummy vitamins every day. Youshare a single bottle of 60 vitamins, 30 of one flavor and 30 ofanother. You each prefer a different...
- Q Research question #2.  Is there arelationship between the relationship between the juveniles’ ageand the change of the scores from pretest to posttest (the largerthe change, the better the outcome)? (13...
- Q Denise is conducting a study related to consumer loyalty towardthree different retail formats (i.e., department stores, specialtystores, and off-price retailers). After gathering backgroundinformation, she decides to focus the study on...
- 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 Match an appropriate correlation for given set of twovariables.1. Number of siblings & Gender Which one: (Chi-squared,point biserial correlation, spearman's rho, pearson's r, kendallstau)2. Math scores & Reading score Which...
- Q A major insurance company looked at teen cell phone use,specifically while driving. Eighty-two percent were using phones inthe sample of fifty drivers.a. Construct the 95% confidence interval forthe proportion of...
- Q Briefly explain to a non-statistician why ANOVA (which is a testof means) is called analysis of variance rather than analysis ofmeans? what variances do we compare in anova?
- Q In a recent year, the Better Business Bureau settled 75% ofcomplaints they received. (Source: USA Today, March 2, 2009) Youhave been hired by the Bureau to investigate complaints this yearinvolving...
- Q A task requires the completion of four activities. A teacherwould like to know if differences in the sequence of the fouractivities results in different task completion times. The teacherselects three...
- Q Consider a short multiple choice quiz with three items, and eachitem has four choices (only one of the choices is correct). Supposethat you are taking this quiz but you are...
- Q For these discussion questions:Define Type I and Type II error and explain their importance instatistical research (5 points).Discuss the use of directional and non-directional hypotheses.How do we make the decision...
- Q When faced with a problem or choice, humans can use twodifferent strategies: \"cognitive reflectivity,\" which results inslower responses and few mistakes, or \"cognitive impulsivity,\"which results in quicker responses but also...
- Q 12.1 Determine the Pearson product-moment correlationcoefficient for the following data.x11197532y9465778(Do not round the intermediate values. Round youranswer to 3 decimal places.)Correlation coefficient, r = enter the Correlationcoefficient rounded to 3...
- Q Some Alzheimer’s caregivers were askedto respond to the following statement: “Caregiving enabled me todevelop a more positive attitude toward life.†The responses arereflected in the following table.Strongly DisagreeSomewhat DisagreeNo OpinionSomewhat...
- Q Below is a list of gas mileage ratings for selected passengercars in miles per gallon.16.2 20.3 31.5 30.5 21.5 31.9 37.3 27.5 27.2 34.1 35.1 29.5 31.822.0 17.0 21.6Find the...
- Q In preparing for the upcoming holiday season, Fresh Toy Company(FTC) designed a new doll called The Dougie that teaches childrenhow to dance. The fixed cost to produce the doll is...
- Q According to the WHO MONICA Project the mean blood pressure forpeople in China is 128 mmHg with a standard deviation of 23 mmHg(Kuulasmaa, Hense&Tolonen, 1998). Blood pressure is normallydistributed.A.State the...
- Q A stationery store wants to estimate the mean retail value ofgreeting cards that it has in its inventory. A random sample of 100greeting cards indicates a mean value of ​$2.53...
- Q A used car dealer says that the mean price of a​ three-year-oldsports utility vehicle is ​$ 22 comma 000 22,000. You suspect thisclaim is incorrect and find that a random...
- Q A system is composed of five components, each of which is eitherworking or failed. Consider an experiment that consists ofobserving the status of each component, and let the outcome of...
- Q An electronics store has 4 branches in a large city. They arecurious if sales in any particular department are differentdepending on location. They take a random sample of purchasesthroughout the...
- Q What is the difference between a pdf and a cdf? How arethey related?Explain this as you would to someone who wasn't in class when Idid. Assume they have taken Calculus...
- Q List three variables, and how they are measured, for which youwould use the mode as the most appropriate measure of centraltendency.
- Q Test the claim about the population mean,muμ ,at the given level of significance using the given samplestatistics. Claim:muμequals=4040 ;alphaαequals=0.060.06 ;sigmaσequals=3.873.87.Sample statistics:x overbarxequals=38.738.7 ,nequals=7676Identify the null and alternative hypotheses. Choose the...
- Q Suppose you have a bag containing 2 red marbles, 3 whitemarbles, and 4 blue marbles.a) if you draw 3 marbles simultaneously, what is the probabilitythat you get one of each...
- Q The time needed to complete a final examination in a particularcollege course is normally distributed with a mean of 100 minutesand a standard deviation of 20 minutes. Answer the followingquestions.(a)What...
- Q Case Study 3: Credit Data, Inc. Credit Data, Inc., has beenmonitoring the amount of time its bill collectors spend on callsthat produce contacts with consumers. Management is interested inthe distribution...
- Q Jake Yum's new computer program \"Learn to be a Great Cook\" isselling off the shelves, and Jake wants to know whether there is agender difference in the cooking quality of...
- Q A researcher studied the effects of three experimental dietswith varying fat contents onthe total lipid (fat) level in plasma. Total lipid level is awidely used predictor of coronary heart disease.Fifteen...
- Q 1) Design a study that uses a dependent samplesdesign2) Design a study that uses an independentsamples design. Be sure to make clear your independent anddependent variables.Base your two studies on...
- Q Use the step by step procedures: Social scientists have longbeen interested in the relationship between economic developmentand health. To gain some insight into this relationship, we canutilize data on the...
- Q   1.   Suppose that cans of creamed corn are producedin a normal distribution so that the average net content weight is16.00 ounces per can, with a deviation of 0.12 ounces. What is...
- Q The equation of a regression line, unlike the correlation,depends on the units we use to measure the explanatory and responsevariables. Here is the data on percent body fat and preferredamount...
- Q QUESTION 1The fundalmental condition that permits proper statisticalinference isa.having a large sampleb.normal distribution of scoresc.random samplingd.knowledge of the values of the parameters of thepopulationQUESTION 2Randomization and random samplinga.can be substituted...
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