Statistics question and answers for August 05, 2023
- Q Two best friends sell cupcakes. They have 3 boxes red velvet , 5boxes vanilla, 4 boxes chocolate, and 6 peanut butter. Each boxthey sells for $4.a)Â Â Define random variableb)Â Â Determine...
- Q John runs a computer software store. Yesterday he counted 139people who walked by the store, 62 of whom came into the store. Ofthe 62, only 22 bought something in the...
- Q Find P(Z ≥ 1.8). Round answer to 4 decimal places.
- Q Let x be a random variable that represents white bloodcell count per cubic milliliter of whole blood. Assume thatx has a distribution that is approximately normal, withmean μ = 6350...
- Q Bark beetles are tiny insects with hard, cylindrical bodies thatreproduce under the bark of trees. While bark beetles are native toU.S. forests and play important ecological roles, they can causeextensive...
- Q The data presented in the table below resulted from anexperiment in which seeds of 4 different types were planted and thenumber of seeds that germinated within 4 weeks after planting...
- Q \"Two measured variables make a study correlational.\"Unfortunately, this conflates (mistakenly treats as the same)the types of claims we can make with the types of statistical testswe can use. We pick...
- Q If a hurricane was headed your way, would you evacuate? Theheadline of a press release states, \"Thirty-two Percent of Peopleon High-Risk Coast Will Refuse Evacuation Order, Survey ofHurricane Preparedness Finds.\"...
- Q 2. A student collected data on the number of large pizzasconsumed, y, while x students were watching a professional footballgame on TV. The data from five games are given in...
- Q A mortgage specialist would like to analyze the average mortgagerates for Atlanta, Georgia. He collects data on the annualpercentage rates (APR in %) for 30-year fixed loans as shown in...
- Q Given below is a fictitious Excel output (numbers might be allmade up) Answer the questions that follow. You are being tested foryour ability to read the output and your skill...
- Q What is specifically meant by sustainability, i.e., what isbeing sustained, in the firm’s mission or value statements?What are the firm’s specific sustainability goals and how arethey measured?What specific strategies, tactics,...
- Q Television have a lifetime of 482 hours; The Sony factory makes10,588  in 3months. the average of a television lastingthis long is  80 . what is the probabilitythat43televisions out of the 10,588?
- Q A company which produces jelly beans claims that the amount, inounces, of jelly beans in their bags is uniformly distributed onthe interval 14 to 18 ounces.(a) On average, how many...
- Q Problem 3) A random digit dialing telephone survey of 880drivers asked, “Recalling the intersections on your most recentdrive to work or school , were any of traffic lights red when...
- Q Write the word or phrase that best completes each statement oranswers the question.Assume that a simple random sample has been selected from anormally distributed population and test the givenclaim. Use...
- Q An experiment was carried out to investigate the effect ofspecies (factor A, with I = 4) and grade (factor B, with J = 3) onbreaking strength of wood specimens. One...
- Q A research report indicated that in 2018, 59% of all6th graders owned a cell phone. A random sample of 1516th graders is drawn.Is it appropriate to use the normal approximation...
- Q For each question on a multiple-choice test, there are fivepossible answers of which exactly one is correct for each question.Assume there are 10 questions on the test and a student...
- Q . Suppose {et : t = −1, 0, 1, . . .} is a sequence of iid randomvariables with mean zero and variance 1. Define a stochasticprocess by xt =...
- Q A boat capsized and sank in a lake. Based on an assumption of amean weight of130130​lb, the boat was rated to carry7070passengers​ (so the load limit was9 comma 1009,100​lb). After...
- Q High Temperature (°F)Number of cans sold55340583356441068460704507561080735847801. A convenience store manager notices thatsales of soft drinks are higher on hotter days, so he assembles thedata in the table.(a) Make a scatter...
- Q What is a Hypothesis statement? And what is the HypothesisTesting Process?​
- Q College Graduation Rates. Data from the CollegeResults Online website compared the 2011 graduation rate and medianSAT score for 92 similar-sized public universities and colleges inthe United States. The scatterplot below...
- Q A new industrial oven has just been installed at Piatt Bakery.To develop experience regarding the oven temperature, an inspectorreads the temperature at four different places inside the oven eachhalf hour...
- Q Vertical banded gastroplasty is a surgical procedure thatreduces the volume of the stomach in order to produce weight loss.In a recent study, 82 patients with Type 2 diabetes underwent thisprocedure,...
- Q The president of a University wishes to find the average age ofstudents presently enrolled. From past studies, the standarddeviation is known to be 2 years. A random sample of 50...
- Q Friends12934951502733611101089927452431221966313495162179739203841721042936138647588116951237194389226736920315540562762115Create a histogram using Excel’s Data Analysis toolpack forFriends. Use the Sturges’ rule to find how many bins you shouldinclude. In your Word file, make sure to in- clude both...
- Q Test the claim about the population mean μ at the level ofsignificance α. Assume the population is normallydistributed.Claim: μ ≠95; α = 0.05; s = 1.53Sample statistics: x =...
- Q Consider the following ANOVA experiment:H0: μ1 =μ2 = μ3 =μ4withn = 21,a sample F statistic = 4.76, andα = 0.025.
- Q The following table was presented in an article summarizing astudy to compare a new drug to a standard drug and to aplacebo.Characteristic*New DrugStandard DrugPlacebopAge, years45.2 (4.8)44.9 (5.1)42.8 (4.3)0.5746% Female51%55%57%0.1635Annual Income,...
- Q Suppose X has probability distributionx: 0 1 2 3 4P(X = x) 0.2 0.1 0.2 0.2 0.3Find the following probabilities:a. P(X < 2)b. P(X ≤ 2 and X < 4)c....
- Q Suppose that during an unexpected snowstorm, Mr. Wong decided totake a random sample of students in his AP Statistics class toexamine their arrival times, in minutes. He compared the differencebetween...
- Q In the 2008 General Social Survey, incomes of marriedrespondents were classified as above average, average, and belowaverage. Respondents also answered a question about maritalhappiness as not happy, pretty happy, or...
- Q the data for the perceived level of stress of 30 employees andeach employee’s number of absences in a 120-day period areshown.Stress LevelLowModerateHigh2.62.72.22.42.72.32.32.12.02.32.72.52.72.92.82.92.22.12.72.61.83.02.41.93.02.52.52.22.42.6a) Write the null and alternate hypotheses for the...
- Q The following data is representative of that reported in anarticle with x = burner-area liberation rate(MBtu/hr-ft2) and y = NOxemission rate (ppm):x100125125150150200200250250300300350400400y140150170220200330290400420430390610600660a. State the appropriate null and alternative hypotheses.b. Calculate...
- Q #33-36, use the following information. Test the claim that themean female reaction time to a highway signal is less than 0.7 s.When 18 females are randomly selected and tested, their...
- Q The diameter of holes for cable harness is known to have astandard deviation of 0.01 in. A random sample of size 10 yields anaverage diameter of 1.5045 in. Use α=0.01...
- Q Height vs Weight - Erroneous Data: You willneed to use software to answer these questions.Below is the scatterplot, regression line, and corresponding datafor the height and weight of 11 randomly...
- Q The data below shows the sugar content in grams of severalbrands of​ children's and​ adults' cereals. Create and interpret a​95% confidence interval for the difference in the mean sugar​content,mu Subscript...
- Q The probability that a given 20-35 year old survives a givenviral infection is 99%. • The probability that a given 65-80 yearold survives the same viral infection is 95%. •...
- Q A sample of 30 houses that were sold in the last year was taken.The value of the house (Y) was estimated. The independent variablesincluded in the analysis were the number...
- Q A researcher tested whether aerobics increased the fitness levelof eight undergraduate students participating over a 4-monthperiod. Students were measured at the end of each month using a10-point fitness measure (10...
- Q Law of Supply: You will need to use software toanswer these questions.The Law of Supply states that an increase in price willresult in an increase in the quantity supplied (assuming...
- Q Suppose the life span of a light bulb is normally distributedwith mean 1000 hours and standard deviation 75 hours. (a) Find the57th percentile of this distribution. (b) Find the probability...
- Q A baseball​ pitcher's most popular pitch is a​ four-seamfastball. The data below represent the pitch speed​ (in miles per​hour) for a random sample of 15 of his​ four-seam fastballpitches.85.5, 86.8,...
- Q Three experiments investigating the relation between need forcognitive closure and persuasion were performed. Part of the studyinvolved administering a \"need for closure scale\" to a group ofstudents enrolled in an...
- Q Listed below are paired data consisting of amounts spent onadvertising (in millions of dollars) and the profits (in millionsof dollars). Determine if there is a significant linear correlationbetween advertising cost...
- Q A study of 20 Canadian cities finds that half of them arepolluted. Six of the 20 cities are selected at random, withoutreplacement, for closer study.(a) What is the probability that...
- Q A study of the relationship between facility conditions at gasstations and aggressiveness in the pricing of gasoline reports theaccompanying data based on a sample of n = 385stations.Table of Observed...
- Q Q7: (About Interval Estimation: 2 marks) A coin is flipped 100times, and 42 heads are observed. Find a 99% confidence interval ofπ (the true population proportion of getting heads) and...
- Q The Wall Street Journal reported that long term Treasury bondshad a mean return of 24.03% in 2008. Assume that the returns forthe long term Treasury bonds were distributed as a...
- Q A deficiency of the trace element selenium in the diet cannegatively impact growth, immunity, muscle and neuromuscularfunction, and fertility. The introduction of selenium supplementsto dairy cows is justified when pastures...
- Q A report included the following information on the heights (in.)for non-Hispanic white females.AgeSampleSizeSampleMeanStd. ErrorMean20–3986365.70.0960and older93964.10.11(a)Calculate a confidence interval at confidence levelapproximately 95% for the difference between population mean heightfor the...
- Q a. Generate a model for y as a function of xb. Is this model useful? Justify your conclusion based oni) R2 adjusted,ii) Hypothesis test for model coefficient,iii) overall model adequacy...
- Q A process has an in-control fraction nonconforming of p =0.02.a) What sample size would be required for the fractionnonconforming control chart if it is desired to have a probabilityof a...
- Q TOPIC: Hypothesis Testing (Statistic Question)In 2015, I taught my first semester at Yale University, astandard deviation was calculated based on the scores on the SDF,the question was asking whether or...
- Q If a patient has a disease there is a 93.8% chance that the testgives a correct positive response and if a patient does not havethis disease, there is a 95.6%...
- Q A regional planner employed by a public university is studyingthe demographics of nine counties in the eastern region of anAtlantic seaboard state. She has gathered the following data:ountyMedian IncomeMedian AgeCoastalA$48,95248.31B46,66958.81C47,78048.00D46,85539.21E37,72451.91F35,41456.21G34,38949.10H38,12830.30I30,38438.90Include...
- Q All work needs to be shownConsider all observations as one sample of X (1st column) and Y(2nd column) values. Answer the following questions: (20points)784.4743.9684764803.5844.1502.3934.7551.7764.9581.7744.6753.4804.3561.7803.9693.7573.1904421.8914.1511.8a) Calculate the correlation coefficient rb) Fit...
- Q 2. The median of an income distribution is $30,000. The meanincome is $35,000 and the standard deviation is $25,000.For each part, if possible compute the quantity,if not possible give your...
- Q During the investigation of an alleged unfair trade practice,the Federal Trade Commission takes a random sample of 50 “3-ounceâ€candy bars from a large shipment. If the mean and the standarddeviation...
- Q DirectTV is interested in conducting a study to determine thepercentage of all their subscribers would be willing to pay $90 permonth for a premium cable package. What is the minimum...
- Q An admissions director wants to estimate the mean age of allstudents enrolled at a college. The estimate must be within 1 yearsof the population mean. Assume the population of ages...
- Q A university offers finance courses numbered 1,2,3,4,5 andaccounting courses numbered 1,2,3,4,5,6. Let F be theevent of selecting a finance course, A the event ofselecting an accounting course, E the event...
- Q CountryAlgeriaArgentinaAustraliaAustriaBelgiumBrazilBurkina FasoCanadaChinaColombiaDenmarkEcuadorEthiopiaFinlandFranceGermanyGhanaGreeceGuatemalaIcelandIndiaIrelandIsraelItalyJapanKenyaLebanonLuxembourgMaltaMexicoMyanmarNetherlandsNew ZealandNicaraguaNorwayPeruPortugalSpainSwedenSwitzerlandTunisiaTurkeyUnited Arab EmiratesUnited KingdomUnited StatesVenezuela, RBLife expectancy75768382817559827674817665818381628272836882828484628082827766828275827582838383757578827974In 2016, the World Health Organization estimated that theaverage life expectancy at birth worldwide was 72 years[1]. (Thisincludes all countries of the...
- Q It has determined that a funded reserve is its preferred methodof retention and it would like to make sure that it has enough tocover losses in 97.5% (2.5% on each...
- Q 1) what does it mean if a psychological scientist runs anexperiment and finds a statistically significant result? a) Thelikelihood of a Type I error is greater than 5% b) The...
- Q The mean diastolic blood pressure for a random sample of 70people was 90 millimeters of mercury. If the standard deviation ofindividual blood pressure readings is known to be 11 millimeters...
- Q A) An Olympic archer is able to hit the bull’s eye 80% of thetime. Assume each shot is independent of the others. She will shoot6 arrows. Let X denote the...
- Q 9.) Emissions of sulfur dioxide by industry set off chemicalchanges in the atmosphere that result in \"acid rain.\" The acidityof liquids is measured by pH on a scale of 0...
- Q Let x = red blood cell (RBC) count in millions per cubicmillimeter of whole blood. For healthy females, x has anapproximately normal distribution with mean μ = 4.2 and standarddeviation...
- Q Shown below is a partial Excel output from a regressionanalysis.ANOVAdfSSMSFRegression  60ResidualTotal19140CoefficientsStandard ErrorIntercept10.002.00x1-2.001.50x26.002.00x3-4.001.00a.Use the above results and write the regression equation. [4Marks]b.Compute the coefficient of determination and fully interpret itsmeaning. [4 Marks]c.Is...
- Q 3. [13 marks] A company is interested in forecasting demand fora product. They have reason to believe that the demand is notaffected by any seasonal changes and that it does...
- Q A pharmaceutical company is developing a treatment for blindnesscaused by diabetic retinopathy. Thus, 5 patients with advancedretinopathy were selected. For each patient, their left eye wastreated and their right eye...
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