Basic Math question and answers for September 06, 2023
- Q While using crunchit/ excel/ software of your choose how do youfind a confidence interval when your variables are in words? i havea list of over 300 patients who are positive...
- Q Populations may be _____________ or ________________________. Areal population is one in which all observations are______________________________ at the time of sampling. Ahypothetical population is one in which all observations are_____________________________ at...
- Q Calculate the average value of the numbers 3, 3, 5, 5 first bycalculating the normal average and then by calculating the weightedaverage. Are the two results the same?
- Q Using the simple random sample of weights of women from a data​set, we obtain these sample​ statistics: n equals = 35 and x=146.25 lb. Research from other sources suggests that...
- Q Let A, B, and C be independent random variables, uniformlydistributed over [0,6],[0,11], and [0,2] respectively. What is theprobability that both roots of the equation Ax^2+Bx+C=0 arereal?
- Q Professor Fair believes that extra time does not improve gradeson exams. He randomly divided a group of 300 students into twogroups and gave them all the same test. One group...
- Q Someone claims that the mean number of sick days that employeesin New Jersey take per year is 5.3. To look into that claim, youtake a representative sample of 78 employees...
- Q \"A random survey of 927 adults in California found that 63% ofthem say they are likely to sleep when they stay home sick.\"e. Construct a 95% confidence interval for p....
- Q The director of a Masters of Public Administration Program ispreparing a brochure to promote theprogram. She would like to include in the brochure the averagegrade point average (GPA) of first-year...
- Q Iconic memory is a type of memory that holds visual informationfor about half a second (0.5 seconds). To demonstrate this type ofmemory, participants were shown three rows of four letters...
- Q Suppose a hypertension trial is mounted and 18 participants arerandomly assigned to one of the comparison treatments. Eachparticipant takes the assigned medication and their systolic bloodpressure (SBP) is recorded after...
- Q Use R to complete the following questions. You should includeyour R code, output and plots in your answer.Two methods of generating a standard normal random variableare:a. Take the sum of...
- Q In a recent issue of Consumer Reports, Consumers Unionreported on their investigation of bacterial contamination inpackages of name brand chicken sold in supermarkets.Packages of Tyson and Perdue chicken werepurchased. Laboratory...
- Q People claim that women say more words per day thanmen. Estimates claim that a woman uses roughly 20,000 words perday, while a man uses approximately 7,000. To investigate this, aresearcher...
- Q The mean and standard deviation of the lifetimes of 9 randomlyselected Duracell batteries are 42 days and 20 days, respectively.The mean and standard deviation of the lifetimes of 11 randomlyselected...
- Q Many high school students take the SAT's twice; once in theirJunior year and once in their Senior year. The Senior year scores(x) and associated Junior year scores (y) aregiven in...
- Q The proportion of adult women in a certain geographical regionis approximately 51​%. A marketing survey telephones 400 people atrandom. Complete parts a through e below.How would the confidence interval change...
- Q Assume that a sample is used to estimate a population proportionp. Find the 99.9% confidence interval for a sample of size199 with 121 successes. Enter your answer as anopen-interval (i.e.,...
- Q Situation: The Ipod Touch has been out for twoyears now and a lot of data has been collected.Relevant Relationship:There is a functional relationship between Price of an IPodTouch,pp and Weekly...
- Q (Similar to Ghahramani Section 3.4, Problems 6, 8, and 14) Threeblack boxes are labeled with Roman numerals I, II and III.• Box I contains four red chips and three blue...
- Q Colorado voted recently on legalizing recreational marijuanause. Prior to the election,pollsters working in favor of legalization wanted to estimatethe proportion of Californiavoters that were in favor of the proposed law....
- Q The processing time for the shipping of packages for a company,during the holidays, were recorded for 48 different orders. Themean of the 48 orders is 10.5 days and the standard...
- Q 1. In preparing to do a study on the proportion of people whouse internet gambling sites, you must determine howmany people to survey. If you want to be 99% confident...
- Q Closer to the November election, better precision and smallermargins of error are desired. Assume the following margins of errorare requested for surveys to be conducted during the electoralcampaign. Assume a...
- Q A survey of 24randomly sampled judges employed by the state of Florida found thatthey earned an average wage (including benefits) of $57.00 perhour. The sample standard deviation was $6.02 per...
- Q Think of a problem dealing with two variables (Y and X) that youmay be interested in. Share your problem and discuss why aregression analysis could be appropriate for this problem.Specifically,...
- Q According to an​ article, 47​% of adults have experienced abreakup at least once during the last 10 years. Of 9 randomlyselected​ adults, find the probability that the​ number, X, whohave...
- Q Let's assume the first scatter plot shown is showing the amountof animals a person has for x and for y it is showing the amount oftimes per month they need...
- Q Suppose a test procedure about the population mean (u) isperformed, when the population is normal and the sample size n isLARGE, then if the alternative hypothesis is Ha : u...
- Q To investigate whether giving chest-compression-only (CC)rather than standard cardiopulmonary resuscitation (CPR) to a heartattack patient will improve the victim's chance of surviving,researchers conducted 2500 trials. In each trial, the EMT...
- Q Come up with a quantitative variable (not mentioned in thetext). Identify the appropriate scale of measurement. Identifywhether this variable is discrete or continuous (or at leasttheoretically continuous). Identify all of...
- Q Give a real-life example of combination orpermutation.
- Q We wish to estimate what percent of adult residents in a certaincounty are parents. Out of 300 adult residents sampled, 201 hadkids. Based on this, construct a 90% confidence interval...
- Q A study was conducted that measured the total brain volume (TBV)(in mm) of patients that had schizophrenia and patients that areconsidered normal. Table #9.3.5 contains the TBV of the normalpatients...
- Q The National Sleep Foundation used a survey to determine whetherhours of sleeping per night are independent of age(Newsweek, January 19, 2004). The following show the hoursof sleep on weeknights for...
- Q (EXCEL) DATA 1 :ParticipantBeforeAfter12001802240165328021542002205190145623025071951758230185921014010190172THE QUESTIONS :Q1\ The value of the test statisic ?Q2\ The value of the p value of the test ?Q3\ What is the H0 rejection region for...
- Q The number of peanut M&Ms in a 2 ounce package is normallydistributed with a mean of 28 and standard deviation 2; The numberof Skittles in a 2 ounce package is...
- Q Assessment 3 – GraphicalLP                                                                       You are given the following linearprogramming problem.           Maximize Z=.           $46X1 + $69X2                       S.T.                 4X1 + 6X2     < 84                                               2X1 + 1 X2    > 20                                               4X1                < 60Using graphical procedure, solve the problem. (Graph theconstraints...
- Q Find the mean, median, and mode of the following data: 0.38,0.52, 0.55, 0.32, 0.37, 0.38, 0.38, 0.35, 0.29, 0.38, 0.28, 0.39,0.40, 0.38, 0.38, 0.38 Mean: Median: Mode:Given the following data...
- Q A fair coin is tossed repeatedly until it has landed Heads atleast once and has landed Tails at least once. Find the expectednumber of tosses.
- Q Heights of 10 year olds. Heights of 10 yearolds, regardless of gender, closely follow a normal distributionwith mean 55 inches and standard deviation 6 inches. Round allanswers to two decimal...
- Q Using dataset \"PlantGrowth\" in R (r code)Construct a 95% confidence interval for the true meanweight.Interpret the confidence interval in in the context of theproblem.
- Q Suppose the heights of 18-year-old men are approximatelynormally distributed, with mean 66 inches and standard deviation 6inches.(a) What is the probability that an 18-year-old man selected atrandom is between 65...
- Q 1. Define the following terms:A. Contingency tableB. Chi-square test2. List the assumptions required to perform a chi-squaretest?
- Q The below age variable was inputted into SPSS and thedescriptive statistics output generated. I did the interquartilerange (39) to try and answer Question #4: Are there outliers amongthe values of...
- Q Math 473: R Homework #4 Name: Due: Thursday, November 7th at thebeginning of class; if your homework is submitted at the end ofclass or later, it will be considered late....
- Q Below is a tabledisplaying the number of employees (x) and the profits per employee(y) for 16 publishing firms. Employees are recorded in 1000s ofemployees and profits per employee are recorded...
- Q A consultant for a large university studied the number of hoursper week freshmen watch TV versus the number of hours seniors do.The result of this study follow. Is there enough...
- Q You have five groups using different exercise techniques and youwant to compare the average number of pounds lost. What test wouldbe appropriate?a. T-testb. ANOVAc. Person's correlation coefficientd. Chi-square
- Q Anystate Auto Insurance Company took a random sample of 370insurance claims paid out during a 1-year period. The average claimpaid was $1580. Assume σ = $250.Find a 0.90 confidence interval...
- Q Let xi, i = 1,2,...,n be independent realizations from apopulation distributed like a Pareto with unknown mean.(a) Compute the Standard Error of the sample mean. [Note:By“computeâ€, I mean “find the...
- Q A fitness course claims that it can improve an individual'sphysical ability. To test the effect of a physical fitness courseon one's physical ability, the number of sit-ups that a personcould...
- Q Assume that​ women's heights are normally distributed with amean given by mu equals 62.2 in​, and a standard deviation given bysigma equals 1.9 in.Complete parts a and b.a. If 1...
- Q List some evaluation projects for which nonprobability samplingmight be appropriate.
- Q 3. There are two machines available for cutting corks for use inwine bottles. The first produces corks with diameters that arenormally distributed with an average of 3 cm and a...
- Q Check My WorkThe National Football League (NFL) polls fans to develop arating for each football game. Each game is rated on a scale from 0(forgettable) to 100 (memorable). The fan...
- Q The annual per capita consumption of bottled water was 30.7gallons. Assume that the per capita consumption of bottled water isapproximately normally distributed with a mean of 30.7 and astandard deviation...
- Q Bags of potato chips have a mean weight of 6 ounces with astandard deviation of 0.2 ounces. There are 100 bags of potatochips in a box.(i) What is the probability...
- Q A researcher is interested in studying the effect that theamount of fat in the diet and amount of exercise has on the mentalacuity of middle-aged women. The researcher used three...
- Q Use the following to answer 5 - 8.Among the four northwestern states, Washington has 51% of thetotal population, Oregon has 30%, Idaho has 11%, and Montana has8%. A market researcher...
- Q A Gallup poll conducted in November of 2011 asked the followingquestion, “What would you say is the most urgent health problemfacing this country at the present time?†The choices were...
- Q The accompanying data table lists the magnitudes of 50earthquakes measured on the Richter scale. Test the claim thatthe population of earthquakes has a mean magnitude greater than1.00.0.720, 0,740, 0.640, .390,...
- Q What is the business value of Analytics? Discuss using examplesoutlined in the article \"Competing of Analytics\"
- Q Match the confidence level with the confidence interval for μ._______ _____ 1. x̄ ± 2.575( σ ) √? _____ 2. x̄ ± 1.96( σ ) √?_____ 3. x̄ ± 1.645(...
- Q A researcher wants to evaluate the effectiveness of cognitivebehavior therapy which he thinks will decrease depression scores.Prior to testing, each of n = 10 patients rated their current levelof depression...
- Q Consider the following hypotheses:H0: μ ≥ 150HA: μ < 150A sample of 80 observations results in a sample mean of 144. Thepopulation standard deviation is known to be 28. Use...
- Q In 2012, the General Social Survey asked a random sample ofadults, \"Compared to most people, how informed are you aboutpolitics?\" Suppose that the following are the data classified bytheir responses...
- Q Pete's Power Pizzas sells a chocolate/tofu filled pastry. Pete'scurrently sells this pastry for $13.15, and makes it for a variablecost of $5.35 per pie. A drop in cocoa prices will...
- Q 6. There are 16 cleaning sponges in a bin at Walmart. 7 aregreen and the remaining 9 are blue. Suppose I randomly select 4sponges. What is the probabilitythat:Â Â Â (Round to 4...
- Q Let us consider a random variable X is the element of U(0, a) sothat a has been obtained as a sample from a random variable A whichfollows a uniform distribution...
- Q A consensus forecast is the average of a large numberof individual analysts' forecasts. Suppose the individual forecastsfor a particular interest rate are normally distributed with a meanof 6 percent and...
- Q 1. Thirty years ago, the mean number of rides that were disabled(broken) for more than twohours at Disneyland was 10.2 per month. The current CEO, BobIger, believes that number hasgone...
- Q do you think that Pill and Mark had good reasons fo choosing theresearch topic initially ?
- Q A genetic experiment involving peas yielded one sample ofoffspring consisting of 443 green peas and 120 yellow peas. Use a0.05 significance level to test the claim that under thesame​circumstances, 26​%...
- Q Are low-fat diets or low-carb diets more effective for weightloss? A simple random sample of 85 adults went on alow-carbohydrate diet for 6 months. At the end of that time,...
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