Basic Math question and answers for September 14, 2023
- Q Do bonds reduce the overall risk of an investment portfolio? Letx be a random variable representing annual percent returnfor Vanguard Total Stock Index (all stocks). Let y be arandom variable...
- Q In the US I want to know what proportion of 13-year-olds vape.Three distributions are associated with this question: populationdistribution, sample distribution, and sampling distribution.Describe the role of each in answering...
- Q Agree or disagree with each of the following statements andprovide a short explanation.Arnold wanted to compare the effects of cardio exercise andweightlifting on weight loss. He ran the following two...
- Q Two rolls of a fair die. Let x and y be the results of the tworolls, and let z = x + y.(a) Find P[x = 4, y = 3],...
- Q Let X and Z be two independently distributed standard normalrandom variables and let Y=X2+Z.iShow thatE(Y|X) =X2iiShow that?Y= 1iiiShow thatE(XY) = 0ivShow that cov(X,Y) = 0 and thus ?X,Y=0
- Q ) The U.S. Census Bureau computes quarterly vacancy andhomeownership rates by state and metropolitan statistical areas.The following data are the rental vacancy rates in percentage (%)grouped by region for the...
- Q We consider 7 bags each containing 6 balls. Each ball isnumbered from 1 to 6. The first 6 bags contain 6 balls where allnumbers from 1 to 6 are present....
- Q This is for Predictive Analytics.1. Read the iris data set into a data frame.2. Print the first few lines of the iris dataset.3. Output all the entries with Sepal Length...
- Q The number of incorrectly transferred calls made per month islisted below for a sample of 8 different months:13 28 39 19 43 28 38 492.1 Calculate the mean number of...
- Q Problem Details:Sharona Medical Equipment, Ltd (fictional name) manufacturesdental drills. The company has been experiencing problems with aspecific part on the production line. Management suspects amachining problem has resulted in the...
- Q Provide a definition of what makes a great leader. You mustcite your resource.Identify someone you know who models this definition ofleadership you have chosen.Profile this person by describing this person’s...
- Q Consider a possible linear relationship between two variablesthat you would like to exploreDefine the relationship of interest and a data collectiontechnique.Determine the appropriate sample size and collect the data.Perform the...
- Q The following data have to do with the relationship betweenmaternal smoking (# of cigarettes smoked per day,which is variable X) and infant birth weight (which is variableY). (?X, ?X2, ?Y,...
- Q In the book Business Research Methods, Donald R. Cooperand C. William Emory (1995) discuss a manager who wishes to comparethe effectiveness of two methods for training new salespeople. Theauthors describe...
- Q What are the minimum and maximum of the following dataset?Normalize these data so that the normalized data have a minimum of0 and maximum of 1.• 5.0, 5.5, 6.2, –4.8, 7.2,...
- Q Consider the class C of all intervals of the form (a, b), a, b ?R, a < b and ?. Show that C is closed under finite intersectionsbut not under...
- Q Sometimes political science studentscan be confused by similar-sounding terms, such as civil libertiesand civil rights, or terms that describe similar but distinctconcepts, such as slander and libel. This confusion is...
- Q Do you want to own your own candy store? Wow! With some interestin running your own business and a decent credit rating, you canprobably get a bank loan on startup...
- Q The Thomas Supply Company Inc. is a distributor of gas-poweredgenerators. As with any business, the length of time customers taketo pay their invoices is important. Listed below, arranged fromsmallest to...
- Q 2. Current estimates suggest that 75% of the home-basedcomputers in a foreign country have access to on-line services.Suppose 20 people with home-based computers were randomly andindependently sampled. Find the probability...
- Q In the following problem, check that it is appropriate to usethe normal approximation to the binomial. Then use the normaldistribution to estimate the requested probabilities. Ocean fishingfor billfish is very...
- Q The Fox TV network is considering replacing one of itsprime-time crime investigation shows with a new family-orientedcomedy show. Before a final decision is made, network executivescommission a sample of 500...
- Q Five people on the basement of a building get on an elevatorthat stops at seven floors. Assuming that each has an equalprobability of going to any floor, find(a) the probability...
- Q opy the table to Excelthen for each part using Excel formula to do the questions belowand make sure to apply DCOVA, which stands forDefine, Collect, Organize, Visualize, and Analyze.1. Find...
- Q A psychologist would like to examine the effects of differentteaching strategies on the final performance of 6thgrade students. One group is taught using material presented inclass along with outdoor discovery,...
- Q Production (1000 tonnes)1587519225246943255435600Export (1000 tonnes)591624198834005100The table shows the relationship between the production and theexport of rice in vietnam from 1985 to 2000.How much rice would you expect Vietnam to export...
- Q In each of the following cases, compute 95 percent, 98 percent,and 99 percent confidence intervals for the population proportionp. (a) pˆ = .8 and n = 97 (Round your answers...
- Q Please give a step by step solution:The ages of a group of 50 women are approximately normallydistributed with a mean of 50 years and a standard deviation of 55years. One...
- Q In your own words, describe the difference between Among GroupVariation and Within Group Variation. Discuss how you wouldevaluate the variation and other methods to ensure that the data isappropriate to...
- Q A weekly time ticket for Joyce Caldwellfollows: Direct Labor Time TicketDates: Monday 8/12 ? Friday 8/16, 2016Ticket Number: TT338Employee: Joyce CaidwellDateTimeStartedTimeEndedTotalHoursJobNumber8/12/20167:00 AM3:00 PM8 hoursJob 2718/13/20167:00 AM3:00 PM8 hoursJob 2718/14/20167:00 AM3:00 PM8...
- Q Danielle and William are visiting an ice cream shop where theywill randomly choose one of the following five regular and premiumflavors.Flavors PriceVanilla Bean $2.00Chocolate Mint $3.00Pralines and Cream $4.00Strawberry Shortcake...
- Q 2. A new chemotherapy drug is released to treat leukemia andresearchers suspect that the drug may have fewer side effects thanthe most commonly used drug to treat leukemia. The two...
- Q Measurements were recorded for the slapshot speed of 100minor-league hockey players. These measurements were found to benormally distributed with mean of 84.388 mph and standard deviationof 3.3706 mph. Would it...
- Q True or False:13. A classical probability measure is a probability assessmentthat is based on relative frequency.14. The probability of an event is the product of the probabilitiesof the sample space...
- Q Your patient’s mammogram is positive for breast cancer which hasa fairly low rate in your state of 1 case per 1,000 women annually.You know from the literature that the mammogram...
- Q I am curious as to how the "descriptive and inferentialstatistics physically mean and how they are used in a simulated"real-world" problem" portion should be answered. I spent a longtime trying...
- Q Evaluate the differences between dependent and independentsamples. Provide an example of each type of sample.
- Q You conduct a study to determine the impact that varying theamount of noise in an office has on worker productivity (0 – 25).You obtain the following productivity scores:Low NoiseMedium NoiseLoud...
- Q Question 1 The coffee shop A coffee shop knows from past recordsthat its weekly takings (sales) are normally distributed with amean of $10,500 and a standard deviation of $478. Answer...
- Q Periodically, customers of a financial services company areasked to evaluate the company's financial consultants and services.Higher ratings on the client satisfaction survey indicate betterservice, with 7 the maximum service rating....
- Q Given the data set below, use it to answer the followingquestions:10, 20, 30, 40, 50a. Find the standard deviationb. Add 5 to each data set value and find the standarddeviation.c....
- Q Using Baynesian estimation. 1. Let X is Poi(?). Let ? be ?(?,?). Show that the marginal pmf of X (the compound distribution) isk1(x) = (? (? + x) ?^x) /...
- Q Part 1.3.13 Overweight baggage: Suppose weights of thechecked baggage of airline passengers follow a nearly normaldistribution with mean 44.8 pounds and standard deviation 3.3pounds. Most airlines charge a fee for...
- Q Suppose a certain state university's college of businessobtained the following results on the salaries of a recentgraduating class:Finance MajorsBusiness Analytics Majorsn1 = 140n2 = 30x1 = $48,437x2 = $55,217s1 =...
- Q In a hearing test, subjects estimate the loudness (in decibels)of sound, and the results are; 12, 68, 74, 66, 37, 52, 71, 90, 65,76, 73, 22. What are the outer...
- Q In the 2008 General Social Survey, participants were asked: “Towhat extent do you consider yourself a religious person?” Of 2023surveyed, 317 responded: “not at all.”(a) Construct a 95% confidence interval...
- Q Employers sometimes seem to prefer executives who appearphysically fit, despite the legal troubles that may result.Employers may also favor certain personality characteristics.Researchers are interested in determining whether fitness andpersonality are...
- Q In the 1996 General Social Survey, for males age 30 and over,the following was true about respondents: • 11% of those in thelowest income quantile were college graduates. • 19%...
- Q How much does a sleeping bag cost? Let's say you want a sleepingbag that should keep you warm in temperatures from 20°F to 45°F. Arandom sample of prices ($) for...
- Q Identify the sample and sample statistic - For 186 randomlyselected babies, the average (mean) of their births weights is3,103 grams (based on data from “Cognitive Outcomes of PreschoolChildren with Prenatal...
- Q What is differences between a parameter and a random variable instatistics?I want clear explanation !!
- Q 1. Suppose in a survey of n = 2000 students, 1200 responded thatthey prefer small classes and 800 responded that they prefer largeclasses. Let p denote the fraction of all...
- Q Using the Standard Normal Table. What is the probability az-score is between -1.82 and -0.68?In other words, what is P( -1.82 < z < -0.68)?A.0.2827B.0.0422C.0.2139D.0.1114
- Q 1. 100,000 Massachusetts adults were randomly sampled with twofactors recorded: whether or not the individualhad diabetes, and whether or not the person ate Kale. Thefollowing gives a table of the...
- Q Let t 0 be a specific value of t. Use the table of criticalvalues of t below to find t 0 dash values such that followingstatements are true. a. Upper...
- Q Maternal age at childbirth. How old are women when they havetheir first child? Here is the distribution of the age of themother for all firstborn children in the United States...
- Q Answer the following questions and use Excel to showyour work.A student has an important exam coming up and is contemplatingnot studying for the exam in order to attend a party...
- Q What kind of distribution would you expect the mean.median andmode to be equal?If the distribution is symmetric, what measure of centraltendency should you use?If the distribution is skewed,what measure of...
- Q The following data shows the price of PAO, Inc. stock over thelast eight months. Month Price ($) 1 2.44 2 2.44 3 2.45 4 2.43 52.44 6 2.45 7 2.44...
- Q Answer the followingquestions and use Excel to show your work.Customers arrive at a supermarket check-out counter with anaverage arrival rate of 9 customers per hour. Answer questions 8–10using the preceding...
- Q In 2011, when the Gallup organization polled investors, 31%rated gold the best long-term investment. But in April of 2013Gallup surveyed a random sample of U.S. adults. Respondents wereasked to select...
- Q A bank classifies borrowers as "high risk" or "low risk," and23% of its loans are made to those in the "high risk" category. Ofall the bank's loans, 8% are in...
- Q A new production process is being contemplated for themanufacture of stainless steel bearings. Measurements of thediameters of random samples of bearings from the old and newprocesses produced the following data...
- Q Cholesterol levels for a group of women aged 30-39 follow anapproximately normal distribution with mean 190.14 milligrams perdeciliter (mg/dl). Medical guidelines state that women withcholesterol levels above 240 mg/dl are...
- Q The following data represent the weight? (in grams) of a randomsample of 13 medicine tablets. Find the? five-number summary, andconstruct a boxplot for the data. Comment on the shape of...
- Q QUESTION 6 Using Table A, p.690-691, the area to the right ofthe z score 0.52 would be a. 0.52 b. 0.6985 c. 0.3015 d. -0.52QUESTION 7 The data point 91...
- Q Dr. Mack Lemore, an expert in consumer behavior, wants toestimate the average amount of money that people spend in thriftshops. He takes a small sample of 8 individuals and asks...
- Q A die is tossed once, and the face, n, is noted. Thenan integer m is selected at random from the set {1,2,···,n}, whichdepends on the face n. a). Find the...
- Q Given the following data of temperature (x) and the number oftimes a cricket chirps in a second (y), run regression analysis andstate the regression equation as long as there is...
- Q In 2011, when the Gallup organization polled investors, 34%rated gold the best long-term investment. In April of 2013 Gallupsurveyed a random sample of U.S. adults. Respondents were asked toselect the...
- Q 1. Use the geometric probability distribution to solve thefollowing problem.On the leeward side of the island of Oahu, in a small village,about 80% of the residents are of Hawaiian ancestry....
- Q A friend who lives in Los Angeles makes frequent consultingtrips to Washington, D.C.; 50% of the time she travels on airline#1, 20% of the time on airline #2, and the...
- Q Market research has indicated that customers are likely tobypass Roma tomatoes that weigh less than70 grams. A produce company produces Roma tomatoes that average78.0 grams with a standarddeviation of 5.2...
- Q Consider the following data drawn independently from normallydistributed populations: (You may find it useful toreference the appropriate table: z tableor t table)x?1x?1 = 25.7x??2x¯2 = 30.6?12 = 98.2?22 = 87.4n1...
- Q Consider the following competing hypotheses and accompanyingsample data. (You may find it useful to reference theappropriate table: z table or ttable) H0: ?1 –?2 = 5HA: ?1 –?2 ? 5x?1x?1 =...
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