An exit poll is taken of 3,350 voters in a statewide election. Let X denote the number who voted in favor of a special proposition designed to lower property taxes and raise the sales tax. Suppose that in the population, exactly 60% voted for it. Find the mean of the probability distribution of X.

Q: Suppose the probability of contracting a certain disease is 1 in 69 for a new case in a given year.…

A: P( new case) ==0.0145q=1-p=1-0.0145=0.9855n=110 people

Q: in a test of the effectiveness of garlic for lowering cholesterol 45 subjects were treated with…

A: n=45, sample mean=46, sample standard deviations=15.5

Q: If team B is the underdog in playing team C and has probability 1/4 of winning every game it plays…

A: The probability of team B winning the game is, P(B)=14The probability that team C wins every game it…

Q: According to a report from a business intelligence company, smartphone owners are using an average…

A: From the provided information,Mean()=24standard deviation()=4sample size(n)=25

Q: In simple linear regression, at what value of the independent variable, X, will the 95% confidence…

A: Let Y be the dependent  variable and X be the independent variable then the simple linear regression…

Q: 1 The length of life (in days) of an alkaline battery has an exponential distribution with an…

A: X~Exp(1365)Mean=365 days

Q: FDIC bank failures. The Federal Deposit Insurance Corporation (FDIC) normally insures deposits of up…

A: X~Poisson distribution. Mean=29

Q: At a college, 72% of courses have final exams and 46% of courses require research papers. Suppose…

A: It is required to calculate the probability that a course has a final exam or a research project,…

Q: The accompanying data represent the total travel tax​ (in dollars) for a​ 3-day business trip in 8…

A: The data related to the total travel tax​ (in dollars) for a​ 3-day business trip in 8 randomly…

Q: 11 of the 744 digital video recorders​ (DVRs) in an inventory are known to be defective. What is the…

A: From the provided information,11 of the 744 digital video recorders​ (DVRs) in an inventory are…

Q: The scores on a standardized test are normally distributed with a mean of 85 and standard deviation…

A: Mean()=85standard deviation()=10

Q: A manufacturer knows that their items have a lengths that are approximately normally distributed,…

A: According to the given information,Mean, μ = 10.1 inchesStandard deviation, σ = 1.7 inchesSample…

Q: State the null and alternative hypotheses. Ho: M = 0 versus H: >0 OH: = 0 versus H₂: 0 Ho: H0…

A: The following information has been…

Q: You work for a soft-drink company in the quality control division. You are interested in the…

A: 11.84,11.99,12.03,12.07,12.04,11.95,11.87,12.04,12.09,12,12.05,12.01,12.01,11.73,11.96sample…

Q: Suppose the probability distribution of x, the number of defective tires on a randomly selected car…

A: We have given the following probability distribution tablexp(x)00.6010.1420.0530.0340.18

Q: (4.20 Purchasing digital devices for children. Refer to the PC Magazine (December 2019) article on…

A: The probability distribution is give as:Where,x is the Age( years)  to buy 1st smart speaker.P(X=x)…

Q: Find the mean and standard error of the mean of the sampling distribution. Then sketch a graph of…

A: We have given thatMean() = 238standard deviation() = 67sample size (n) = 33

Q: Salma is a civil engineer working for the city of Indianapolis on a project to widen some of its…

A: Suppose the random variable x defines the noonday temperature of the asphalt.The random variable x…

Q: Data from a representative sample were used to estimate that 33% of all computer users in a recent…

A: It is given that margin of error (E) is 0.04 and assumed that the confidence level is 95%.(No…

Q: Let z be a standard normal random variable with mean ? = 0 and standard deviation ? = 1. Use Table 3…

A: We have given thatMean( = 0Standard deviations () = 1

Q: a random sample of farms (in thousands) in various states follows. Estimate the mean number of farms…

A: The formula for the Confidence interval for mean is:

Q: hypothesis test that rank correlation in the population is zero is conducted at the 5% level of…

A: Sample size n=15Rank correlation coefficient r=0.50

Q: The length of time of calls made to a support helpline follows an exponential distribution with an…

A: X~Exp(λ=150=0.02)

Q: Variations in process output that are due to factors such as machine tools wearing out are Select…

A: Assignable Causes: Assignable causes are variations in a process that can be traced back to…

Q: (Exponential distribution) An expert says that the number of days before a new case discovered for a…

A: Mean=5Let "x" be the number of days before a new case discoveredA random variable…

Q: A standardized exam's scores are normally distributed. In a recent year, the mean test score was…

A: Unusual value: The Z-value is said to be Unusual if the Z is greater than 2 or less than –2. From…

Q: For a marketing class term project, Bob is investigating whether college seniors eat less frequently…

A: There are two independent samples which are Seniors and Freshmen.We have to test whether the mean is…

Q: The Excel file Auto Survey contains a sample of data about vehicles owned, whether they were…

A: Consider the given data: GenderTypePurchasedVehicle…

Q: The scores on the Accuplacer test and High School GPAs are normally distributed. The Accuplacer test…

A: The mean of the Accuplacer test,  The standard deviation of the Accuplacer test, The mean of High…

Q: Select all statements that are TRUE. As the size of a sample increases, the mean of the distribution…

A: The sample size is the no. of participants or observations included in a study. The number is…

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A: σ=71.9,E=3,CI=98%=0.98α=1−CI=1−0.98=0.02

Q: Has that rate of genetic testing changed in recent years in the U.S.? In a 2016 Harvard Poll of…

A: This is a hypothesis test of one sample proportion Z test.Steps of the hypothesis  test as follows…

Q: According to a 2009 Reader's Digest article, people throw away about 7% of what they buy at the…

A: Given: Population proportion (p) = 7%  = 0.07    Sample proportion                  Sample size (n)…

Q: Do students perform the same when they take an exam alone as when they take an exam in a classroom…

A: The question is hypothesis testing.Given :To find :Do students perform same when they take exam…

Q: 1. The following measurements have been obtained in a study: No. y x1 X2 No. y x1 7 8 1.14 1 2 3 4 5…

A: Consider the given data:…

Q: Find the range, mean, variance and standard deviation of the given data set.  Pregancy Durations:…

A: Dataxx2277767292918468129587025280784002687182427877284291846812777672928279524279778412968761628581…

Q: X is a random variable whose cumulative distribution function F(x) satisfies F(1) = 13, F(2) = 34,…

A: Random variable is a function which takes points in form of events from sample space and gives…

Q: w many sample points exist for this experiment? successful unsuccessfu = IQ y Is 10 M N" um w N" WM…

A: A financial manager made two new investments-one in the oil industry and one in municipal…

Q: Let z be a standard normal random variable with mean ? = 0 and standard deviation ? = 1. Use Table 3…

A: Z has follows standard normal distribution with mean zero and standard deviation one.

Q: Discuss the difference between the 95% and 99% confidence levels. What are the corresponding alpha…

A: We have to tell the difference between 95% and 99% confidence level We have to calculate…

Q: ans while 325 of the 506 randomly selected wildfires looked at the west were caused by humans. What…

A: Sample sizes n1=594 ,n2=506Favorable cases x1=363 ,x2=325NOTE: According to bartleby guidelines…

Q: 10 grams. If you pick one fruit at random, what is the probability that it will weigh between 655…

A: Mean = 676Std. deviation = 10

Q: The chance that you win a game is 60%. How many times on average should an individual play this game…

A: We have given thatProbability (p) = 60% = 0.60Standard deviation ()  = 2.2

Q: Are Republicans just as likely as Democrats to display the American flag in front of their residence…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: Blue Box is testing a new “half price on Tuesday” policy on DVD rentals at a sample of 10 locations.…

A: There are two dependent samples which are New Price and Old Price.We have to test whether the mean…

Q: Using the regression table I created, how should I perform the F-Test at 0.05 level of significance…

A: Given that: n=61 observationk= 2 independent variables The multiple regression output table is…

Q: Recently, an automobile insurance company performed a study of a random sample of 15 of its…

A: Here we have to identify which hich is the most appropriate analysis to conduct to answer this…

Q: A. What is the probability that at least one of the doctors going to the conference is a Harvard…

A: Number of doctors is(n(D))=12Number of harward university n(H)=3Number of doctors randomly…

Q: High school seniors with strong academic records apply to the nation's most selective colleges in…

A: From the given information we haveTwo events A and B are said to be mutually exclusive if i.e., the…

Q: A sample of 135 is drawn from a population with a proportion equal to 0.55. Complete parts a)…

A: sample size(n)=135population proportion(p)=0.55x~Binomial(n=135,p=0.55)P(X=x)=