Basic Math question and answers for September 01, 2023
- Q In order to make sure that all math formatting is properlydisplayed, you are strongly encouraged to reload this page afteropening. In order to make sure that all math formatting is...
- Q 5.34 Number of friends on Facebook. To commemorate Facebook’s10-year milestone, Pew Research reported several facts aboutFacebook obtained from its Internet Project survey. One was thatthe average adult user of Facebook...
- Q The following data is from a survey that was conducted in both1996 and 2001. Did the rates of smoking differ from 1996 to 2001?*Smokers are defined as those who smoke...
- Q In a certain state lottery, a lottery ticket costs $1. In termsof the decision to purchase or not to purchase a lottery ticket,suppose that the following payoff table applies:State of...
- Q The accompanying data file shows the square footage andassociated property taxes for 20 homes in an affluent suburb 30miles outside of New York City. Estimate a home’s property taxes asa...
- Q Here is a bivariate data set.xy50.496.853.727.6-17.6158.649.9-48.130.5-6.136.717943.5-3.940.565.152.1-129.743.585.133.4-41.463.4-5025.331.841.211.834.4149.450.5-50.5Find the correlation coefficient and report it accurate to threedecimal places.r =
- Q Of the travelers arriving at a small airport, 50% fly on majorairlines, 20% fly on privately owned planes, and the remainder flyon commercially owned planes not belonging to a major...
- Q The output of a chemical process is monitored bytaking a sample of 20 vials to determine the level of impurities.The desired mean level of impurities is 0.048 grains per vial....
- Q In a study conducted to investigate browsing activity byshoppers, each shopper was initially classified as a nonbrowser,light browser, or heavy browser. For each shopper, the studyobtained a measure to determine...
- Q The population average cholesterol content of a certain brand ofegg is 215 milligrams, and the standard deviation is 15 milligrams.Assume the variable is normally distributed.(a) Find the probability the cholesterol...
- Q In a randomized controlled​ trial, insecticide-treated bednetswere tested as a way to reduce malaria. Among 322 infants using​bednets, 13 developed malaria. Among276 infants not using​ bednets, 29 developed malaria. Use...
- Q State the likely relative positions of the mean, median, andmode for the following distributions:Family income in large cityScores on a very easy examHeights of a large group of 25-year old...
- Q You are a cognitive psychologist who has developed a newtreatment for depression. Currently, the most effective treatmentsfor depression are behavioral treatments and pharmacologicaltreatments (treatments involving medication). In order to validateyour...
- Q Suppose that a company's sales increase when the economy isdoing well. Also, suppose that thecompany's advertising budget is based upon the number of sales, andthat larger sales lead to a...
- Q You download two sets of posts from an online forum. Set One isa collection of posts by \"pro-Hong Kong Protestors\" (HKP) students.Set Two is a collection of posts by pro-Chinese...
- Q question13: TABLE 14-1A manager of a product sales group believes the number of salesmade by an employee ( Y) depends on how many years thatemployee has been with the company...
- Q A person's blood glucose level and diabetes are closely related.Let x be a random variable measured in milligrams of glucose perdeciliter (1/10 of a liter) of blood. Suppose that after...
- Q AsC60:G100ecretarial service found that 90% of their invoices arepaid promptly (within 10 days). A random sample of 12 invoices ischecked. Use this situation to answer the parts below.(a)Recognizing thatthis is...
- Q A bridge across a deep jorge has a capacity of 5184pound. If the weights of tourists have a mean of 160 pounds and astandard deviation of 38 pounds, find the...
- Q Acme Biotech requires all new employees to undergo a drug testscreening.  As part of the collection process, key donorinformation is entered on a form referred to as the“Non-Federal Four-Part Drug...
- Q Learning ObjectivesLearn more about the statistical analysis tools inSPSS.Practice manual calculations and confirm with SPSSoutput.Walk through all steps of hypothesis testing for arelated-samples t-Test.About Your DataA statistics student was late...
- Q When should logistic regression be used for data analysis?What is the assumption of logistic regression?How to explain odds ratio?
- Q Let X have a binomial distribution with parametersn = 25and p. Calculate each of the following probabilitiesusing the normal approximation (with the continuity correction) forthe casesp = 0.5, 0.6, and...
- Q Let x be a random variable that represents the weightsin kilograms (kg) of healthy adult female deer (does) in Decemberin a national park. Then x has a distribution that isapproximately...
- Q A researcher would like to evaluate the effectiveness of apain-relief patch designed for lower back pain. Prior to testingthe patch, each of n = 4 patients rates the current levelof...
- Q What are three different techniques a researcher can use toestablish convergent validity of a measure? Explanation andexamples please!-Research Methods and Statistics
- Q Riehl (1994) examined whether Indiana University students whowere the first generation in their family to attend college weremore at risk of dropping out during their first semester than otherstudents. The...
- Q What is the purpose of cross-validation? Specifically, whywouldn’t we test a hypothesis trained on all of the availableexamples?
- Q The capacities (in ampere-hours) were measured for a sample of120 batteries. The average was 178 and the standard deviation was12.a.)Find a95% lower confidence bound for the mean capacity of this...
- Q When σ is unknown and the sample is of size n≥ 30, there are two methods for computing confidence intervals forμ.Method 1: Use the Student's t distribution withd.f. = n...
- Q Adam, Brian, Chris and Donald are taking goal shots in soccer.They take shots in the order, Adam, Brian, Chris, Donald, thenrepeat. By going in this order they have an equal...
- Q 4. Suppose a company wants to find the determinants of jobsatisfaction for its employees. The company gathers some anonymousdata from its employees and runs a regression with Job Satisfaction(on a...
- Q The management at an environmental consulting firm claims themean weekly salary is $275 with a standard deviation of $34.10.If we want to address the question “If management’s claims aretrue, what...
- Q What are the two types of variances which can occur in yourdata? ANOVA and ANCOVA/Experimenter and participant/Between andwithin group/Independent and confounding. What test statistic isused to test the hypothesis in...
- Q Q6. You are the assistant director of political research for theNBC television network, and two candidates Jeffrey Temple andRotenberg Marvel, are running for president of the United States.You need to...
- Q A government officialis in charge of allocating social programs throughout the city ofVancouver. He will decide where these social outreach programsshould be located based on the percentage of residents living...
- Q Suppose the Federal Aviation Administration (FAA) would like tocompare the on-time performances of different airlines on domestic,nonstop flights. To determine if Airline and Status are dependent,what are the appropriate hypotheses?A)HO:...
- Q (a) Find the margin of error for the given values of​ c, σ​, andn. c = 0.90​, σ = 3.8​, n = 100E= _ (Round to three decimal places as​...
- Q We assume that our wages will increase as we gain experience andbecome more valuable to our employers. Wages also increase becauseof inflation. By examining a sample of employees at a...
- Q Heights of 10 year olds. Heights of 10 year olds, regardless ofgender, closely follow a normal distribution with mean 55 inchesand standard deviation 6 inches. Round all answers to two...
- Q Crimini mushrooms are more common than white mushrooms, and theycontain a high amount of copper, which is an essential elementaccording to the U.S. Food and Drug Administration. A study wasconducted...
- Q In the Focus Problem at the beginning of this chapter, a studywas described comparing the hatch ratios of wood duck nestingboxes. Group I nesting boxes were well separated from each...
- Q Child Health and Development Studies (CHDS) has been collectingdata about expectant mothers in Oakland, CA since 1959. One of themeasurements taken by CHDS is the weight increase (in pounds) forexpectant...
- Q 1. One method for obtaining random numbers is by Middle Squaremethod, you are asked to create an algorithm to get a random numberwith an 6 digit integer number. And give...
- Q Question 11(CO 4) Seventy-nine percent of products come off the line readyto ship to distributors. Your quality control department selects 12products randomly from the line each hour. Looking at the...
- Q In a recent marketing campaign, Olive Garden Italian Restaurant®offered a “NeverEnding Pasta Bowl.†The customer could order anarray of pasta dishes, selecting from 7 types of pasta and 6 typesof...
- Q A measure of the strength of the linear relationship that existsbetween two variables is called: Slope/Intercept/Correlationcoefficient/Regression equation. If both variables X and Y increasesimultaneously, then the coefficient of correlation will...
- Q We performed a linear regression analysis between number oftimes on phone per drive and number of near accidents. The equationis Y= 0.320 + 0.943X, where Y is the number of...
- Q You are an analyst for the Coral Cola Company and are interestedin the association between age and rating of a new type of soda(Irish-Cream Cream-Soda). You suspect that younger individuals...
- Q Complaints concerning excessive commercials seem to grow as theamount of “clutter,†including commercials and advertisements forother television shows, steadily increases on network and cabletelevision. A recent analysis by Nielsen Monitor-Plus...
- Q Start from number 5The following table shows the number ofmarriages in a given State broke down by age groups and gender:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â AGE at the time of the marriageLess than 2020-2425-3435-4445 +TotalMale5057,76027,07210,95012,173Female1,25211,40527,6329,65110,352TotalsUse...
- Q Maurice’s Pump Manufacturing Company currently maintains plantsin Atlanta and Tulsa that supply major distribution centers in LosAngeles and New York. Because of an expanding demand, Maurice hasdecided to open a...
- Q Age at onset of dementia was determined in the generalpopulation to be m = 75.5 and s = 5.8.Based on the data above, what is the z score for theage...
- Q Consider the following regression model: Yi = αXi + Ui , i = 1,.., n (2)The error terms Ui are independently and identically distributedwith E[Ui |X] = 0 and V[Ui...
- Q or each of the following​ situations, find the critical​value(s) for z or t.​a)H0​:rhoÏequals=0.50.5vs.HA​:rhoÏnot equals≠0.50.5atalphaαequals=0.010.01​b)H0​:rhoÏequals=0.40.4vs.HA​:rhoÏgreater than>0.40.4atalphaαequals=0.100.10​c)H0​:muμequals=1010vs.HA​:muμnot equals≠1010atalphaαequals=0.100.10​;nequals=2626​d)H0​:rhoÏequals=0.50.5vs.HA​:rhoÏgreater than>0.50.5atalphaαequals=0.010.01​;nequals=335335​e)H0​:muμequals=2020vs.HA​:muμless than<2020atalphaαequals=0.100.10​;nequals=10001000​a) The critical​ value(s) is(are)â–¼z*t*equals=nothing.​(Use a comma to separate answers as needed. Round...
- Q Ask Your TeacherThe local bakery bakes more than a thousand 1-pound loaves ofbread daily, and the weights of these loaves varies. The meanweight is 2 lb. and 3 oz., or...
- Q An ordinary deck of playing cards has 52 cards. There are foursuits-​spades, ​hearts, diamonds, and clubs with 13 cards in eachsuit. Spades and clubs are​ black; hearts and diamonds are...
- Q A recent survey of math students asked about their overallgrades. 22 students were surveyed, and it was found that theaverage GPA of the 22 sampled students was a 3.2, with...
- Q Part 2– R work (must be done inR)Copy and paste your R code and output into a word document,along with your written answers to the questions, and upload toCanvas.  Follow these...
- Q The following regression output was obtained from a study ofarchitectural firms. The dependent variable is the total amount offees in millions of dollars.Predictor     CoefSE Coef      T     PConstant7.9872.9672.69-X10.122420.031213.920.0000X2-0.121660.05353-2.270.028X3-0.062810.03901-1.610.114X40.52350.14203.690.001X5-0.064720.03999-1.620.112Analysis of VarianceSource         DFSS    MS     F    PRegression53710.00742.0012.890.000Residual Error462647.3857.55Total516357.38X1 - # of...
- Q This case study concerns a bank's efforts to calculate creditrisk scores (These are opposite of credit scores. Higher the valuethe riskier the customer) A loan officer at a bank needs...
- Q Two plots at Rothamsted Experimental Station were studied forproduction of wheat straw. For a random sample of years, the annualwheat straw production (in pounds) from one plot was asfollows.5.707.035.847.037.317.187.065.796.245.916.14Use a...
- Q Why are there no negative values in the ztable?If you were given an individual’s raw scoreand it was above the mean, what steps would you take to determinethat individual’s percentile?...
- Q A staff psychologist at a police precinct developed a week-longtraining course designed to improve on the job sensitivity ofpolice officers. The psychologist designs a study where somepolicemen randomly get and...
- Q Test the claim that the proportion of men who own cats issmaller than the proportion of women who own cats at the .10significance level.left tailed right tailed two tailedtest statisticcritical...
- Q The following table shows ceremonial ranking and type of potterysherd for a random sample of 434 sherds at an archaeologicallocation.CeremonialRankingCooking JarSherdsDecoratedJar Sherds (Noncooking)RowTotalA8154135B9451145C7777154ColumnTotal252182434Use a chi-square test to determine if ceremonial...
- Q The College Board provided comparisons of Scholastic AptitudeTest (SAT) scores based on the highest level of education attainedby the test taker's parents. A research hypothesis was thatstudents whose parents had...
- Q A tele-marketing company wants to know if sales go up as theycall more people per day but spend less time per call. Thefollowing is the data from nine randomly selected...
- Q Scores on an MBA placement exam are reported to have a normaldistribution with standard deviation 18. The exam officials statedthat the average score for all students was 70. You take...
- Q How can I do one-way ANOVA in RStudio?
- Q This semester we have discussed the following statisticalanalyses.             Z-test              One-Samplet-test                  Independent Groupst-test                 Repeated Measures t-testOne-Way ANOVA                          Regression                                        Correlation1. Research shows that people who do well on the SAT tend to dowell in college (they have a...
- Q According to a survey by TD Ameritrade, one out of fourinvestors has exchange-traded funds in their portfolios (USAToday, January 11, 2007). Consider a sample of 40investors.Compute the probability of exactly...
- Q The proportion of public accountants who have changed companieswithin the last three years is to be estimated within 4%. The 95%level of confidence is to be used. A study conducted...
- Q 2. The weights of American newborn babies are normallydistributed with a mean of 119.54 oz (about 7 pounds 8 ounces) anda population standard deviation of 0.67 oz. A sample of...
- Q A study was conducted to assess the effects that occur whenchildren are exposed to cocaine before birth. Children were testedat age 4 for object assembly​ skill, which was described as​...
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