Statistics question and answers for August 13, 2023
- Q Scenario:On March 28 at 1:30 pm, I randomly selected 10 states and foundthe number of coronavirus cases in each of them.  Thisgave me an average of 939 cases with a standard...
- 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 The director of research and development is testing a newmedicine. She wants to know if there is evidence at the 0.01 levelthat the medicine relieves pain in more than 313...
- Q Major health studies try very hard to select a sample that isrepresentative of the various ethnic groups making up the U.S.population. Here is the breakdown, by ethnicity, of subjectsenrolled in...
- Q A sociologist studied random samples of full-time employees ina particular occupation – six women and six men – to determinewhether gender has an influence on the average (mean) number ofhours...
- Q Find the following5C17P010C28P3
- Q Theater tickets for a hit show have four pricesdepending on seating. The prices ae $50, $100, $150 and $200. Theprobability a ticket sells for $50 is .4. The probability it...
- Q Given the following sample observations, draw a scatter diagramon a separate piece of paper.X:−7−1611116Y:502481553343Compute the correlation coefficient. (Round your answerto 3 decimal places.)Coefficient of correlation ________Does the relationship between the...
- Q It is generally believed that there is a relationship between acollege’s acceptance rate and its graduation rate. I wanted to knowhow strong this relationship is within the top universities in...
- Q A survey of 200 drivers who were at fault in an accident foundthat 62% were dropped by their insurance carrier. Conduct ahypothesis test at a 0.10 level of significance to...
- Q according to a study by the american pet food dealersassociation 63% of U>S> households own pets. A report isbeing prepared for an editorial in the san Francisco chronicle tostudy pet...
- Q 3). You are given the claim that the mean of a population is notequal to 24 cm. Youdon’t believe in this claim and so you want to test it. Supposethat...
- Q A simple random sample from a population with a normaldistribution of9797body temperatures hasx overbarxequals=98.7098.70degrees Upper F°Fandsequals=0.670.67degrees Upper F°F.Constructa99​%confidence interval estimate of the standard deviation of bodytemperature of all healthy humans.
- Q List three types of regression and a real-world example of each.Why do you think regression is so critical in statistics?
- Q Listed below are the weights (in grams) of a sample of M&M'sPlain candies, classified according to color.RedOrangeYellowBrownTanGreen0.9460.9020.9290.8960.8450.9351.1070.9430.9600.8880.9090.9030.9130.9160.9380.9060.8730.8650.9040.9100.9330.9410.9020.8220.9260.9030.9320.8380.9560.8710.9260.9010.8990.8920.9590.9051.0060.9190.9070.9050.9160.9050.9140.9010.9060.8240.8220.8520.9220.9300.9300.9080.9651.0520.8830.9520.8330.8980.9030.9390.8950.9400.8820.906Identify the null hypothesis and the alternate hypothesis.Null hypothesis:a) H0: μ1 ≠μ2 ≠μ3...
- Q Potatoes - Samples: Suppose the weights ofFarmer Carl's potatoes are normally distributed with a mean of 8.0ounces and a standard deviation of 1.3 ounces.Suppose Carl bags his potatoes in randomly...
- Q A random sample of 150 men found that 88 of the men exerciseregularly, while a random sample of 200 women found that 130 of thewomen exercise regularly.a. Based on the...
- Q Allen's hummingbird (Selasphorus sasin) has beenstudied by zoologist Bill Alther.†Suppose a small group of 17Allen's hummingbirds has been under study in Arizona. The averageweight for these birds is x...
- Q 1. A researcher wants to know what kind of exercising is mostlikely to lead to improve people’s moods. He has participantsengage in one month of regular workouts (cardio, weight training,or...
- Q An experiment was conducted to determine if there was a meandifference in weight for women based on type of aerobics exerciseprogram participated (low impact vs. high impact). Body mass index(BMI)...
- Q Two brands of car​ batteries, both carrying​ 6-year warranties,were sampled and tested under controlled conditions. Five of eachbrand failed after the number of months shown. Calculate ​a) bothsample means and...
- Q The scores of students on the SAT college entrance examinationsat a certain high school had a normal distribution with meanμ=542.7 and standard deviation σ=29.8.(a) What is the probability that a...
- Q The results indicated that more money was donated in theidentified-victim-only condition than in the statistics-onlycondition (p = .02). Compute the tLSD value here.For low Rational scorers,donations differed significantly by request...
- Q a study of prostate cancer was initiated in Des Moines, Iowa. Atotal of 1,000 men, 55-64 years of age, with no prior evidence ofprostate cancer were enrolled in the study....
- Q Since an instant replay system for tennis was introduced at amajor​ tournament, men challenged 1427 referee​ calls, with theresult that 411 of the calls were overturned. Women challenged 747referee​ calls,...
- Q 1. The U.S. Department of Transportation reported that duringNovember, 83.4% of SouthwestAirlines’ flights, 75.1% of US Airways’ flights, and 70.1% ofJetBlue’s flights arrived on time (USAToday, January 4, 2007). Assume...
- Q Suppose that 57% of all college seniors have a job prior tograduation. If a random sample of 80 college seniors is taken,approximate the probability that more than 46 have a...
- Q The following data gives the monthly sales (in thousands ofdollars) for different advertising expenditures (also in thousandsof dollars) and sales commission percentages.Sales                  245     138     352    322     228    275...
- Q Stew’s Cars operates 3 dealerships in three regions. The GeneralManager, Lynn, questioned whether the company’s mean profit marginper vehicle sold differed by region.Steps1. Specify population parameter of interest and state...
- Q A ship is carrying 30 travelers from various great houses on along sea voyage from Braavos to King’s Landing where they willparticipate in the Game of Thrones: 5 are from...
- Q Low-fat or low-carb? Are low-fat diets or low-carb diets moreeffective forweight loss? A sample of 77 subjects went on a low-carbohydratediet for sixmonths. At the end of that time, the...
- Q Write a research hypothesis for which the independent samplest-test will be appropriate. Clearly identify the independent anddependent variables, and two potential confounding factors.
- Q Two types of medication for hives are being tested. Themanufacturer claims that the new medication B is more effectivethan the standard medication A and undertakes a comparison todetermine if medication...
- Q Independent Samples T-test1. If n1 = 100 and n2 = 100, determine the critical value of tfor an independent samples t test, two-tailed alpha = .05.2. Calculate pooled variance: n1...
- Q 5. Suppose that researchers study a sample of 50 people and findthat 10 are left-handed. (a) Find a 95% confidence interval for thepopulation proportion that is left-handed. (b) What would...
- Q 5 part a) The business college computing center wants todetermine the proportion of business students who have personalcomputers (PC's) at home. If the proportion exceeds 35%, then thelab will scale...
- Q a) In order to estimate the population mean, μ, to within 3 at95% confidence, what is the minimum sample size required?(Assumeσ=6.7).b) If just the population standard deviation were to increase,then...
- Q 1 part a) A local eat-in pizza restaurant wants to investigatethe possibility of starting to deliver pizzas. The owner of thestore has determined that home delivery will be successful if...
- Q 1. Over a sample of 47 voyages. Mr. Sulu found theStarship Enterprise traveled a mean of 658light-years-per-dilithium-crystal (lypdc) with a standard deviationof 76 lypdc.(a) Find a point estimate for the...
- Q The design of an automotive gear requires the diameter to be 4inches. To evaluate the production quality, you sample 30 gears andfind the average to be 4.11 with a standard...
- Q Let x be a random variable representing percentagechange in neighborhood population in the past few years, and lety be a random variable representing crime rate (crimes per1000 population). A random...
- Q MemberNot a MemberTotalMale225158383Female306112418Total531270801what is the Calculation.  of the test statistic for aChi-Square test for independence using the chart above?
- Q In the following table, The independent variableis_______________ , and the dependent variable is_____________ Whatis the null and the alternative hypotheses?  Running achi-square analysis, you obtain a chi-square value of 22.9 with...
- Q Suppose you have a sample of 36 observations with the samplemean = 2 and the sample standard deviation = 7. Compute thet-statistic corresponding to these values for the null hypothesisthat...
- Q Conduct an appropriate hypothesis test using theprovided information[Neatly show all steps / necessary calculations, includingboth a complete comparison & interpretation statement AND plainEnglish inference statement].The National Center for Health Statistics...
- Q Profitability remains a challenge for banks and thrifts withless than​ $2 billion of assets. The business problem facing a bankanalyst relates to the factors that affect return on assets​ (ROA),an...
- Q Previous research states, \"no evidence currently existssupporting or refuting the use of electric fans during heat waves\"in terms of mortality and illness. Counterintuitively, PublicHealth guidelines suggest not using fans during...
- Q Workers at a certain soda drink factory collected data on thevolumes​ (in ounces) of a simple random sample of 15 cans of thesoda drink. Those volumes have a mean of...
- Q My Research Methods class (N = 14) was interested in whetherstudying alone or in groups would result in better grades on theirthird exam. Half of the class (n = 7)...
- Q A study investigated whether regular mammograms resulted infewer deaths from breast cancer over a period of 16 years. Among30,636 women who never had​ mammograms, 196 died of breast​ cancer,while only166...
- Q Confidence in banks: A poll conducted in 2012asked a random sample of 1342 adults in the United States how muchconfidence they had in banks and other financial institutions. Atotal of...
- Q a box of 400 ipads has 50 defective and the rest are goodquality. A sample of 20 ipads is selected at random withoutreplacement. Find the probablity that of the sample...
- Q 1. A sample of 20 items provides a sample standard deviation of5.a. Compute the 90% confidence interval estimate of thepopulation variance.(2pts)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 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â b. Compute the 95% confidence interval estimate of thepopulationvariance.(2pts)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 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â c. Compute...
- Q Below are the values for two variables x and y obtained from asample of size 5. We want to build a regression equation based thesample data.yÌ‚ = bâ‚€ + bâ‚xyx165211086281253141The...
- Q The British Department of Transportation studied to see ifpeople avoid driving on Friday the 13th. They did a traffic counton a Friday and then again on a Friday the 13th...
- Q 2. M&M’s are delicious. “They melt in your mouth, not inyour hand.†According to the M&M’s company, their most popularcolor is blue.(a) You open regular pack of M&M’s find that...
- Q 1. How do you understand the concept of measurement, includingmeasurement validity and reliability, in criminal justiceresearch?2. How do you view measurement issues in police auditing,particularly in performance audits?3. What specific...
- Q Explain when you use the χ 2-Test for Independence/Homogeneityand when you use the χ 2-Test for Goodness-of-Fit. Why do you notcompute a confidence interval for these two tests. (You should...
- Q In a population of Siberian flying squirrels in western Finland,assume that the the number of pups born to each female over herlifetime has mean ?=3.66 and standard deviation ?=2.9598. Thedistribution...
- Q A national soccer team scores 1 goal per game on average. Letthe data from the past 20 games be given by1,2,2,1,1,1,1,2,1,4,0,2,3,0,2,1,0,3,4,1. Using this information,please answer the following questions.(a) (1 point)...
- Q A statistical program is recommended.The Consumer Reports Restaurant Customer SatisfactionSurvey is based upon 148,599 visits to full-service restaurantchains.†Assume the following data are representative of the resultsreported. The variable type indicates...
- Q Each of three supermarket chains in the Denver area claims tohave the lowest overall prices. As part of an investigative studyon supermarket advertising, a local television station conducted astudy by...
- Q 2. (9 pts) It is difficult to determine a person’s body fatpercentage accurately without immersing him or her in water.Researchers hoping to find ways to make a good estimate immersed...
- Q A pet food company has a business objective of expanding itsproduct line beyond its current kidney and shrimp-based cat foods.The company developed two new products, one based on chicken liverand...
- Q Suppose you are interested in finding out how many people in thepopulation have Covid19. How would you attempt to do that? Explaincarefully. What are some challenges that you might encounter...
- Q Scientific Reasoning with Philosophy and StatisticsWe learned about what is commonly referred to as classical orfrequentist statistics and discussed Bayesian statistics in theRomero paper and the Aeon article with the...
- Q Suppose that the sitting​ back-to-knee length for a group ofadults has a normal distribution with a mean of mu equals 23.4 in.and a standard deviation of sigma equals 1.1 in....
- Q We are interested in seeing if there are any meaningfuldifferences in the willingness of certain tapestry segments to buyorganic products. Top Tier reports purchasing an average of 3.8organic items per...
- Q An unknown distribution has mean 82 and a standard deviation of11.2. Samples of size n = 35 are drawn randomly from thepopulation. Find the probability that the mean of the...
- Q Why might the exponential family of distributions be important?In other words, if areal-world application turned out to have adistribution which is of this family, what interesting results orconvenient truths might...
- Q R Problem Set:#Work with the inbuilt dataset \"Cars\"View(cars)This will show you the dataset on 2 variables speed anddistance.?carsThis will explain what the variables mean.#Q1) Describe the dataset. What are the...
- Q Question 1 (1 point)For each of the following variables, identify the level ofmeasurement (nominal, ordinal, interval, or ratio).(I) Satisfaction level on a survey (e.g. very dissatisfied,satisfied, very satisfied, etc.)(II) Year...
- Q A highway department is studying the relationship betweentraffic flow and speed. The following model has beenhypothesized:y = β0 +β1x + εwherey = traffic flow in vehicles per hourx = vehicle...
- Q Allergic reactions to poison ivy can be miserable. Plant oilscause the reaction. Researchers at Allergy Institute did a study todetermine the effects of washing the oil off within 5 minutes...
- Q How might you motivate what a sufficient statistic is? Find asufficient statistic for the Poisson distribution with parameterlambda.
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