Statistics question and answers for July 04, 2023
- Q Consider the experiment of rolling two dice and the followingevents:    A: 'The sum of the dice is 8'and  B: 'The first die is an odd number' andC:  \"The difference (absolute value) of the...
- Q A company samples the distribution of conductivity in isolationof receptacles and got the following values:24.46 25.61 26.25 26.42 26.66 27.15 27.31 27.54 27.74 27.9427.98 28.04 28.28 28.49 28.50 28.87 29.11...
- Q An SRS of 16 households is selected in Houston and the numberof remote controls is counted. We are interested in a hypothesistest that tests if population mean number of remote...
- Q M&M plain candies come in various colors. According to theM&M/Mars Department of Consumer Affairs, the distribution ofcolors for plain M&M candies is as follows.Color: Purple 23%, Yellow 19%, Red 22%,...
- Q Almost all employees working for financial companies in New YorkCity receive large bonuses at the end of the year. A sample of 63employees selected from financial companies in New York...
- Q use the standard normal table to find the z-score thatcorresponds to the cumulative area 0.0594. If the area is not inthe table use the entry closet to the area. if...
- Q A bank manager wants to know the mean amount of mortgage paidper month by homeowners in an area. A random sample of 114homeowners selected from this area showed that they...
- Q You may need to use the appropriate appendix table or technologyto answer this question.A simple random sample of 50 items from a population withσ = 8resulted in a sample mean...
- Q A manufacturer claims that the average tar content of a certainkind of cigarette is μ = 14.0. In an attempt to show that itdiffers from this value, five measurements are...
- Q Assume a normal distribution and find the followingprobabilities. (Round the values of z to 2 decimal places. Roundyour answers to 4 decimal places.)(a) P(x < 18 | μ = 22...
- Q When do I use:Geometric cdfGeometric pdfbinomial cdfBinomial pdfThank you
- Q A market research firm conducts telephone surveys with a 47%historical response rate. If 75 individuals are contacted, find theprobability that 36 or less of them will cooperate and respond tothe...
- Q In each of the following areas, what're two examples of how dataaccuracy can be compromised by inappropriate choices of theresearcher;a. Survey questionnaire designb. Sampling plan for a surveyc. Data collection...
- Q A city planner wants to estimate the average monthly residentialwater usage in the city. He selected a random sample of 40households from the city, which gave the mean water usage...
- Q A light fixture contains five lightbulbs. The lifetime of eachbulb is exponentially distributed with mean 205 hours. Whenever abulb burns out, it is replaced. Let T be the time of...
- Q Easy Talk phones have an electronic component that isproduced by WiredUp Inc. Under normal operations 8% of thesecomponents are defective. Every week, the production process istested by inspecting 10 of...
- Q Exponential distribution with λ = 0.5 Apply Chi-Square test tosee whether the your hypothesized distribution fits your data.using excel
- Q For this problem, carry at least four digits after the decimalin your calculations. Answers may vary slightly due torounding.A random sample of medical files is used to estimate the proportionp...
- Q Suppose that in a certain region of California, earthquakesoccur at the average rate of 7 per year.(a) What is the probability that in exactly three of the nexteight years, no...
- Q 30 students were randomly selected from a large group ofstudents taking a certain test. The mean score for the students inthe sample was 86.Assume that σ = 11.1. Construct a...
- Q Suppose a survey revealed that 22% of 502 respondents said theyhad in the past sold unwanted gifts over the Internet.(a) Use the information to construct a 90% confidence intervalfor the...
- Q Scholastic Aptitude Test (SAT) mathematics scores of a randomsample of 100 high school seniors in the state of Texas arecollected, and the sample mean and standard deviation are found tobe...
- Q A community health association is interested in estimating theaverage number of maternity days women stay in the local hospital.A random sample is taken of 36 women who had babies in...
- Q Listed below is the population by state for the 15 states withthe largest population. Also included is whether that state'sborder touches the Gulf of Mexico, the Atlantic Ocean, or thePacific...
- Q Suppose the following data are selected randomly from apopulation of normally distributed values. 41 51 43 48 44 57 54 3940 48 45 39 40 Construct a 95% confidence interval...
- Q 2. A recent poll revealed that 54 out of 96 people believedhoneydew should be removed from all versions of fruit salad. Createa 92% confidence interval and discuss whether or not...
- Q Every few years, the National Assessment of Educational Progressasks a national sample of eighth-graders to perform the same mathtasks. The goal is to get an honest picture of progress in...
- Q The times that college students spend studying per week have adistribution skewed to the right with a mean of 7.6 hours and astandard deviation of 2.6 hours. Find the probability...
- Q Scores for men on the verbal portion of the SAT-I test arenormally distributed with a mean of 509 and a standard deviation of112.(a)Â Â If 1 man is randomly selected, find the...
- Q A group of chemists wanted to determine whether a new catalyst 2increased the reaction rate of a particular chemical reactionrelative to that same chemical reaction with an older catalyst 1.The...
- Q An economist wants to estimate the mean per capita income (inthousands of dollars) for a major city in Texas. Suppose that themean income is found to be $36.6 for a...
- Q Sally plays a game and wins with probability p. Every week, sheplays until she wins two games, and then stops for the week. Sallycalls it a \"lucky week\" if she...
- Q An educator wants to determine whether early exposure to schoolwill affect IQ. He enlists the aid of the parents of 12 pairs ofpreschool-age identical twins who agree to let their...
- Q 4. The weights of professional rugby players are normallydistributed with mean weight 92 kilograms and standard deviation12.8 kilograms.(a) Find the probability that a randomly selected professionalrugby player weighs less than...
- Q Please show all work. A study was undertaken to see how accuratefood labeling for calories on food that is considered reducedcalorie.  The group measured the amount of calories foreach item of...
- Q Discuss how the coefficient of determination and thecoefficient of correlation are related. How are they used inregression analysis?A seasonal index may be less than one, equal to one, or greaterthan...
- Q Create an excel workbook for the followingquestions. Answer these questions under your Solver work for eachrespective problem.1. Devos Inc. is building a hotel. It will have 4 kinds ofrooms: suites...
- Q The population proportion is 0.36. What is the probability thata sample proportion will be within ±0.04 of the populationproportion for each of the following sample sizes? (Round youranswers to 4...
- Q Find the lower z score that bounds the middle 65%?Round to the fourth.
- Q You are given the sample mean and the population standarddeviation. Use this information to construct the 90% and 95%confidence intervals for the population mean. Interpret the resultsand compare the widths...
- Q In a recent survey concerning company sales and net earnings, 15companies responded with the following information.CompanySales($ thousands)Net Earnings($ thousands)Runners54.84.1NorthCo24.00.8JenStar42.62.2Text Tech57.64.2Capital Consultants56.73.6Financial Services34.91.8Cantu Excavating49.52.8Pace Design25.71.0CanTech Supply21.40.4Second Time Around Clothing25.30.7Echo Systems23.1-0.1Antique Accents51.33.5Spin...
- Q Use the SEM formula and show all work.How satisfied are hotel managers with the computer systems theirhotels use? A survey was sent to 400 managers in hotels of size 200to...
- Q The manager of the main laboratory facility at Urban HealthCenter is interested in being able to predict the overhead costseach month for the lab. The manager believes that total overheadvaries...
- Q A random sample of 42 taxpayers claimed an average of ​$9,857 inmedical expenses for the year. Assume the population standarddeviation for these deductions was ​$2,409. Construct confidenceintervals to estimate the...
- Q A restaurant tried to increase business on Monday night, byfeaturing a special $1.00 dessert menu. The number of diners oneach of 11 Mondays recorded while the special menu was ineffect.The...
- Q suppose average pizza delivery times are normally distributedwith unknown population mean and population standard deviation of6. A random sample of 28 pizza delivery restaurants is taken andhas a sample mean...
- Q Statistics))1.The Round-trip-time between the college and home for a studentis normally distributed with a mean of 47 min and a standarddeviation of 4.6 min. To one-decimal place, what Round-trip-timewould be...
- Q ACT Prep Course. ACT prep courses like to market that you canincrease your ACT score by taking their courses. Some statisticianswere curious how effective these courses really were. They decidedto...
- Q Round probabilities to four places. For example, 0.1234. Showyour work. For example, if you are adding two probabilities youcould do this: 7/59 + 9/59 = 16/59 = 0.2712.1. You draw...
- Q State the null and alternative hypotheses for each of thefollowing situations. (That is, identify the correct numberμ0 and write H0:μ=μ0 and the appropriateanalogous expression for Ha.)A.      The average Julytemperature in a...
- Q Almost all medical schools in the United States require studentsto take the Medical College Admission Test (MCAT). To estimate themean score μ μ of those who took the MCAT on...
- Q Total plasma volume is important in determining the requiredplasma component in blood replacement therapy for a personundergoing surgery. Plasma volume is influenced by the overallhealth and physical activity of an...
- Q a hypothesis was made that students would preformbetter at an optimal amount of playtime.selected 3 classes to be given a certain amount ofplaytime per dayclass 1, 30 minutes of playclass...
- Q In a combined study of northern pike, cutthroat trout, rainbowtrout, and lake trout, it was found that 26 out of 857 fish diedwhen caught and released using barbless hooks on...
- Q MY NOTESHow much do wild mountain lions weigh? Adult wild mountain lions(18 months or older) captured and released for the first time inthe San Andres Mountains gave the following weights...
- Q The New York Times conducted a poll on women’s issues in June of1989. One question asked was, “Many women have better jobs and moreopportunities than they did 20 years ago....
- Q Password consists of five characters: one lowercase letter andfour digits 0 – 9.How many possible combinations for the password are there ifdigits can be repeated?How many possible combinations for the...
- Q The table below gives the age and bone density for five randomlyselected women. Using this data, consider the equation of theregression line, yˆ=b0+b1x, for predicting a woman's bone densitybased on...
- Q In a championship series, the winner emerges by winning 5 out ofeight games. Teams A and B play in the championship, but team A hasa 60% chance of winning compared...
- Q What is a strategy for handling a confounder?a) None of the aboveb) Enroll all patients and stratify the datac) All of the aboved) Enroll only patients that report no exposure...
- Q Suppose x has a normal distribution with mean μ = 32 andstandard deviation σ = 12. Describe the distribution of x valuesfor sample size n = 4. (Round σx to...
- Q Consider the value of t such that the area under the curvebetween −|t| and |t| equals 0.98.Step 2 of 2:Assuming the degrees of freedom equals 16, determine the tvalue. Round...
- Q Cesar wants to know what the expected weight of a loaf of breadfor quality control purposes. Based on a sample of 14 loaves ofbread, he finds a sample average of...
- Q When a truckload of apples arrives at a packing plant, a randomsample of 150 apples are selected and examined for bruises andother defects. In reality, 12% of the apples on...
- Q The polling organization Ipsos conducted telephone surveys inMarch of 2004, 2005 and 2006. In each year, 1001 people age 18 orolder were asked about whether they planned to use a...
- Q Recent evidence has surfaced regarding the effect of multipleCAT scans on the increase in risk for blood related cancers inchildren aged 5-18. Suppose after selecting 267 cases of childhoodcancers, researchers...
- Q Three cards are chosen at random froma standard deck of 52.What is the probability that all three cards are hearts?What is the probability that all three cards are even?What is...
- Q In a sample of 70 randomly selected students, 29 favored theamount being budgeted for next year's intramural andinterscholastic sports. Construct a 98% confidence interval for theproportion of all students who...
- Q in an experiment on learning 70 rats were taught tonavigate a maze during a 3 week training period. half the rats(n=35) were randomly selected to receive cocaine injections for aweek...
- Q Are whites more likely to claim bias? A survey conducted byBarry Goldman Found that of 56 white workers terminated, 126claimed bias. Of 407 black workers terminated, 126 claimed bias. a.Given...
- Q Foot Locker uses sales per square foot as a measure of storeproductivity. Last year, the mean annual sales per square foot was$390 with a standard deviation of $45.83. Suppose you...
- Q Themean preparation fee H&R Block charged retail customers in 2012was $183 (The Wall Street Journal, March 7, 2012). Use this priceas the population mean and assume the population standard deviationof...
- Q Thirty-one small communities in Connecticut (population near10,000 each) gave an average of x = 138.5 reported casesof larceny per year. Assume that σ is known to be 43.7cases per year.(a)...
- Q Given are five observations for two variables, x and y. xi 1 2 34 5 yi 4 7 6 12 14 a. Using the following equation: 12.32a.jpgEstimate the standard deviation...
- Q What price do farmers get for their watermelon crops? In thethird week of July, a random sample of 44 farming regions gave asample mean of x = $6.88 per 100...
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