Statistics question and answers for July 06, 2023
- Q Given the data below, what is the estimated bias given areference value of 24.521?Data24.987224.267525.202724.691924.936125.517624.850324.173524.848124.89824.874724.609624.611624.91862524.51925.720724.981725.227624.919
- Q In 625 at bats a baseball player got a hit 28% of the time. Finda 95% confidence interval for the true percentage of time he gets ahit.
- Q You are given the following hypotheses: Null hypothesis: p =0.3Alternative hypothesis: ? ≠ 0.30You decide to take a sample of size 90. Suppose we will rejectthe null hypothesis if the...
- Q A health psychologist seeks to predict compliance with medicalprescriptions using a self-report measure of methodicalness (M) anda health knowledge test (HK), the latter scored as pass (1) / fail(0). Out...
- Q Think of an example of a study where randomization is notfeasible. Put the example in the Potential Outcome Model Framework.Include the outcome variable and treatment. State thecounterfactuals. Â
- Q Dual-energy X-ray absorptiometry (DXA) is a technique formeasuring bone health. One of the most common measures is totalbody bone mineral content (TBBMC). A highly skilled operator isrequired to take the...
- Q Problems 16-18: Lengths of pregnancies are normally distributedwith a mean of 268 days and a standard deviation of 15 days.(Usethe z-table). What percentage of pregnancies last less than 250days?What percentage...
- Q Roulette is a casino game that involves spinning a ball on awheel that is marked with numbered squares that are red, black orgreen. Half of the numbers 1-36 are colored...
- Q A fishing lake camp boasts that about 30% of the guests catchlake trout over 20 pounds on a 4-day fishing trip. Let nbe a random variable that represents the first...
- Q Please Use your keyboard (Don't usehandwriting)Stat(1)An insurance company believes that people can be divided intotwo classes: those who are an accident prone and those who are not.The company’s statistics show...
- Q A television station wishes to study the relationship betweenviewership of its 11 p.m. news program and viewer age (18 years orless, 19 to 35, 36 to 54, 55 or older)....
- Q You may need to use the appropriate appendix table or technologyto answer this question. A binomial probability distribution has p= 0.20 and n = 100. (a) What are the mean...
- Q Square footage (thousands)Price of house thousands2.74782.33282.33091.82981.93032.14661.43281.63852.13602.93742.23872.64522.14621.84361.94240.953081.34301.94492.23251.23581.44671.84891.24851.14501.43531.83582.34431.74221.33681.5416data for the selling prices of homes in a ZIP code and thesquare footage of those homes. Use the Spearman rank correlation todetermine if there...
- Q 1) You wonder whether men or women are morelikely to be driving when both a man and a woman are in the frontseat of a car. You observe 20 cars...
- Q A study of iron deficiency among infants compared samples ofinfants following different feeding regimens. One group containedbreast-fed infants, while the infants in another group were fed astandard baby formula without...
- Q The current median survival time of patients  withacute myelogenous lukemia who achieve complete remission fromconventional treatment is 21 months. A new procedure is beingstudied. Researchers hoped that with this new procedure,...
- Q A test for a certain drug produces a false negative 3% of thetime and a false positive 9% of the time. Suppose 12% of theemployees at a certain company use...
- Q Let y1, y2, .....y10 be a random sample from an exponential pdfwith unknown parameter λ. Find the form of the GLRT for H0: λ=λ0versus H1:λ ≠λ0. What integral would...
- Q A simple random sample of size n is drawn from a population thatis normally distributed. The sample​ mean, x overbar​, is found tobe 112​, and the sample standard​ deviation, s,...
- Q For a particular chemical synthesis, the effect of precursorconcentration and catalyst amount were studied.Catalyst amount0.5 kGCatalyst amound1 kGPrecursor concentration15%17, 18, 2131, 28, 29Precursor concentration30%28, 24, 2734, 37, 41Calculate the :...
- Q An adoption agency compared the cost of the adopting babies fromChina and Russia (for people living in the US). The average cost ofadopting a baby from China was $11,045 with...
- Q Bob Sparrow purchases steak from a local meatpacking house. Themeat is purchased on Monday at $2.00 per pound, and the shop sellsthe steak for $3.00 per pound. Any steak left...
- Q The Capital Asset Price Model (CAPM) is a financial model thatattempts to predict the rate of return on a financial instrument,such as a common stock, in such a way that...
- Q Many food products contain small quantities of substances thatwould give an undesireable taste or smell if they are present inlarge amounts. An example is the \"off-odors\" caused by sulfurcompounds in...
- Q Can the cost of flying a commercial airliner be predicted usingregression analysis? If so, what variables are related to thiscost? A few of many variables that can potentially contribute aretype...
- Q Student #GenderHeightShoeAgeHand1F688.520R2F605.527R3F64731R4F677.519R5F65820R6F66929R7F629.530L8F638.518R9F60519L10F637.542R11F61720R12F647.517R13F65819R14F68819R15F637.518R16F627.519R17F64723R18F721128R19F62820R20F596.529R21F648.519R22F689.523R23F659.534R24F63827R25F65823R26F627.530R27F677.531L28F66937R29F61624R30F616.546R31F68820R32F637.542R33F635.533R34F58520R35F65844R36F69928R37F68920R38F63749R39F626.519R40F667.519R41F697.555R42F691140R43F636.519R44F617.520R45F68919R46F65925R47F62731R2. Using the SCC men’s/women’s class sample data at the ?=0.05,is there enough evidence to conclude that there is a significantlinear correlation between men’s/women’s height and men’s/women’sshoe size?a. State...
- Q A pharmaceutical company is evaluating its efficiency of itsglucose control drug. The company believes that the drug controlsglucose levels with the normal range of 80 to 115. A sample of...
- Q 6. The heights of women are normally distributed with a mean of65 in. and a standard deviation of 2.5 in. The heights of men arenormally distributed with a mean of...
- Q Stata command for running an RDD with 2 treamtents and cut-offlines
- Q According to a 2004 report by Roger Boe et. Al. of CorrectionalService Canada, the mean length of a Canadian jail sentence in2001/2002 was ? = 4.10 months with σ =...
- Q From a sample of 64 days, General Motors register a Xof 3.58 accidents pe day with s = of 52. What is confidenceinterval covers that the mean number of accidents...
- Q 0BedroomBathroomCarsSQ FT298,00032.501,566319,90032.502,000354,0003220374,90042.502,816385,0004200389,00032.502,248399,0004302,215415,00032.503,188444,9003202,530450,0003201,967465,0004302,564340,00042.502,293275,00032.521,353425,0003201,834250,00032.505,837450,00032.509,060390,00033.501,002269,00032.501,680425,00032.524,356425,00022.522,993425,0003304,356429,90053.512,154400,00032.521,846399,9003212,018388,9904402,295Construct and interpret a correlation matrix for your data. andexplain the relationship.Show the step wise process of determining the best regressionmodel to predict PRICE. EXPLAIN the process as you...
- Q Calculate the test statistic and p-value for each sample meanand make the statistical decision (3 points each).1. H0: µ ≤ 16 versus H1: µ > 16, x = 17, s...
- Q 1. Assume that a simple random sample has been selected from anormally distributed population and test the given claim. Identifythe null and alternative​ hypotheses, test​ statistic, P-value, andstate the final...
- Q Find the mean and variance of the gamma distribution usingintegration to obtain E(X) and E(X^2 ).[Hint: Express the integrand in terms of a gamma density.][Hint: Use the fact that the...
- Q In a study of the role of young drivers in automobile accidents,data on the percentage of licensed drivers under the age of 21 andthe number of fatal accidents per 1000...
- Q An elevator has a placard stating that the maximum capacity is1328 lb--8 passengers. So, 8 adult male passengers can have a meanweight of up to 1328/8=166 pounds. If the elevator...
- Q An engineer is going to redesign an ejection seat for anairplane. The seat was designed for pilots weighing between 150lband 201lb. The new population of pilots has normally distributedweights with...
- Q The numbers illustrates a normal distribution for the pricespaid for a particular model of HD television. The mean price paidis $1000 and the standard deviation is $60.820, 880, 940, 1000,...
- Q The lengths of pregnancies in a small rural village are normallydistributed with a mean of 264 days and a standard deviation of 15days.In what range would we expect to find...
- Q A doctor claims that the number of births by day of the week isuniformly distributed. To test this claim, you randomly select 700births from a recent year and record the...
- Q If the joint probability distribution of X1 and X2 is given by:f(X1, X2) = (X1*X2)/36 for X1 = 1, 2, 3 and X2 = 1, 2, 3, find thejoint probability...
- Q Data collected from two groups of subjects, one used genericdrugs(Gen) and the other used Refernce drug(Ref). The averageabsorption extent for Refernce drug that applied to Nref=78subjects was Xref=2065, with the...
- Q A chemical engineer is investigating the effect of processoperating temperature on product yield.The study results in thefollowing data:Temperature Yield100 59.63110 72.28120 70.98130 74.35140 88.23150 100.28160 106.41170 113.01180 113.71190 124.07You can...
- Q ]It is widely known that alcohol related car accidents can havea big impact on people’s lives. One widely reported statistic isthat the mean number of “years of potential life lostâ€...
- Q The lengths of pregnancies in a small rural village are normallydistributed with a mean of 266 days and a standard deviation of 13days.In what range would we expect to find...
- Q What is the probability that seven-digit phone number has one ormore repeated digits ?The leading number can not be zero (0).
- Q The following table lists the activities needed to complete aproject. The first column lists the activities and the “followsâ€column shows which other activity or activities, (if any), must becompleted before...
- Q Jensen Tire & Auto is in the process of deciding whether topurchase a maintenance contract for its new computer wheelalignment and balancing machine. Managers feel that maintenanceexpense should be related...
- Q A simple random sample of size n is drawn from a population thatis normally distributed. The sample​ mean, x over bar​, is found tobe 106​, and the sample standard​ deviation,...
- Q Ralph’s bowling scores in a single game are normally distributedwith a mean of 120 and a standard deviation of 10.Lucky Lolly’s bowling scores in a single game a normallydistributed with...
- Q Historically, the number of cars arriving per hour at Lundberg’sCarWash is observed to be the following:Number of Cars ArrivingFrequency410530650765845Total:200a. Set up a probability distribution table (including the lowerend ofthe probability...
- Q Use the sample data and confidence level given below to completeparts​ (a) through​ (d).In a study of cell phone use and brain hemispheric​ dominance,an Internet survey was​ e-mailed to 2510...
- Q Explain the difference between continuous randomvariables and discrete random variables. please give examples!
- Q The following table summarizes the results from a two-factorstudy with 3levels of Factor A and 4 levels of Factor B using a separatesample of 5participants in each treatment condition. Fill...
- Q A manufacturer wants to compare thenumber of defects on the day shift with the number on the eveningshift. A sample of production from recent shifts showed thefollowing defects:DayShift                    5         8         7         6         9         7Evening Shift            8         10       7         11       9         12           14       ...
- Q Why do we naturally tend to trust some strangers more thanothers? One group of researchers decided to study the relationshipbetween eye color and trustworthiness. In their experiment theresearchers took photographs...
- Q In 2001 Kenkel and Terza published an article in which theyinvestigated the impact on an individual's alcohol consumption of aphysician's advice to reduce drinking. The simplified model belowwas estimated with...
- Q Testing ONE mean versus a claim (z or t)Testing TWO means head to head (t)1. What if we want to test MORE than TWO means?2. What are the null hypotheses...
- Q Salaries of 39 college graduates who took a statistics course incollege have a​ mean, x overbar​, of $ 68 comma 900. Assuming astandard​ deviation, sigma​, of ​$19 comma 972​, construct...
- Q An amusement park studied methods for decreasing the waitingtime (minutes) for rides by loading and unloading riders moreefficiently. Two alternative loading/unloading methods have beenproposed. To account for potential differences due...
- Q The following table compares the completion percentage andinterception percentage of 5 NFL quarterbacks. CompletionPercentage 57 59 61 65 65 Interception Percentage 4.8 4.7 4.5 3.11.1 TableStep 4 of 5 :...
- Q The Diabetes Control and Complications Trial followed diabetespatients diagnosed with retinopathy before joining the study. Theywere randomly assigned to one of two treatments and monitored for 6years. The study found...
- Q X and Y are the future lifetimes of two machines. The joint PDFof the two random variables is f(x, y) = 12(x+y+1)^-5, x>),y>0. Calculate E(X|Y = 2).
- Q 2) Male company employees aged 21 to 26 are found to drive anaverage of 19484 km a year. The annual mileage is normallydistributed with a standard deviation of 6812 km....
- Q Acertain electric car's driving range when fully charged isapproximately normally distributed, with a mean distance of 345 mi,and a standard deviation of 18mi.A) What is the probability that a randomly...
- Q The foot size of each of 16 men was measured, resulting in thesample mean of 27.32 cm. Assume that the distribution of foot sizesis normal with sigma = 1.2 cm.a)...
- Q Confidence IntervalsDo the calculations on paper. Show all work by writing theequation in symbol format first. Then define each symbol in termsof the problem. Show each step of your calculation,...
- Q Consider the value of t such that the area under the curvebetween −|t| and |t| equals 0.99.Step 2 of 2:Assuming the degrees of freedom equals 8, determine the t value.Round...
- Q A political scientist is interested in the question of whetheror not there is a difference between Republicans and Democrats whenit comes to their involvement in voluntary associations. Using a25-point scale...
- Q A company wants to determine whether its consumer productratings​(0minus−​10)have changed from last year to this year. The table below showsthe​ company's product ratings from eight consumers for last yearand this...
- Q For which of the following research questions could you testusing a dependent samples t-test? Group of answer choices Dostudent athletes and non student athletes differ on levels ofself-esteem? Is there...
- Q Question 1. The numbers 5, 8, 10, 7, 10, and 14 gather from asimple random sample of a population. Determine/Calculate the pointestimate of the population mean (or worded another way,...
- Q Potatoes: Suppose the weights of Farmer Carl's potatoes arenormally distributed with a mean of 9 ounces and a standarddeviation of 1.1 ounces. (a) Carl only wants to sell the bestpotatoes...
- Q The Acme Company manufactures widgets. The distribution ofwidget weights is bell-shaped with a mean of 37 ounces and astandard deviation of 3 ounces. Using the Empirical Rule, answerthe following questions....
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