Suppose X~ N(-1, 2). What is the z-score of x = 2?

Q: A study of 100 Stat 101 students revealed that the 55th percentile of their final exam scores is 45.…

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Q: z-score that has 73.6​% of the​ distribution's area to its right.

A: To find the z value, use the standard normal table to find the z-score which cuts off an area of…

Q: You are performing a two-tailed test. If α=.005α=.005, find the positive critical value, to two…

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Q: Find the values of x1 x2 x3 using initial guess of 0,1,5 with error of 0.001%

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Q: Data from a two-way table with 6 columns and 6 rows has x² = 40.65. Find the $P$-value for the…

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Q: An urban community would like to show that the incidence of breast cancer is higher in their area…

A: Define the population as: Population 1 : urban community Population 2 : Rural community  The sample…

Q: There is a test designed to measure overall life happiness, (where higher scores indicate more…

A: Given, μ = 85σ = 12 Higher scores indicate more happiness.         To find: a. Person with lowest…

Q: An education researcher claims that at most 3% of working college students are employed as teachers…

A: Solution: From the given information, p-hat=0.04 and n=200. The given claim is that at most 3% of…

Q: Suppose X - N(-1, 2). What is the z-score of x = 2?

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Q: ou are performing a left-tailed test. If α=.02α=.02, find the critical value, to three decimal…

A: Defined :  the test is a left-tailed test. and α=.02

Q: One sample of n=10 scores has a mean of 8 and a second sample of n= 5 scores has a mean of 2. if the…

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Q: Suppose that the number of asbestos particles in a sample of 1 squared centimeter of dust is a…

A: Solution Given That , Suppose that the number of asbestos particles in a sample of 1 squared…

Q: The coefficient of rank correlation of the marks obtained by 10 students in statistics and…

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Q: A researcher hypothesized that score differed between th golfers from the 2021 U.S. Open. At the…

A: Given :  Paired data for randomly selected golfers α = 0.05

Q: How can I compute P-value?

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Q: A real estate agent working in a large city believes that, for three-bedroom houses, the selling…

A: From the given information,       β1( slope)=-2.158,S.E( β1) =0.149n=20α=0.05

Q: You are performing a right-tailed test. If α=.005α=.005, find the critical value, to three decimal…

A: Given that the test is right-tailed test. The level of significance is, α =0.005 The objective is to…

Q: Suppose that the random change in value of a financial asset is X over the first day and Y over the…

A: The variance of X+Y is calculated asVarX+Y=VarX+VarY-2CovX,Y

Q: A statistical study is made to compare the % of smokers in small rural towns to the overall smoking…

A: Given Information:n=1500x=285c=95%=0.95

Q: What is the kurtosis for the distribution of scores with a mean of 9.02 and a mode of 3?

A: Given information: Mean = 9.02, Mode = 3 The distribution of right skewed distribution.

Q: You are performing a two-tailed test. If a = .005, find the positive critical value, to three…

A: we have given that  two tailed test level of significance (α)=0.005

Q: A market analyst has estimated that 10% of American citizens who wear glasses or contact le purchase…

A: Given that, out of 900 people, 103 are declared that they purchase their eyewear from their…

Q: If null hypothesis is false because a drop has occurred, then the observed z will be?

A: It is given that the null hypothesis false. That is, it should be rejected.

Q: In a sample of 74 leopards selected randomly from one preserve, it is found that 7 of them have…

A: Solution: Let X be the number of leopards have respiratory problems and n be the sample number of…

Q: The coefficient of rank correlation of the marks obtained by 10 students in statistics and…

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Q: A real estate agent working in a large city believes that, for three-bedroom houses, the selling…

A: Given: n = 20 Slope = -2.158 Standard error for the slope  of regression line = 0.149 Significance…

Q: You are performing a left-tailed z-test If a = .10, find the critical value, to two decimal places.

A: For the left-tailed ; we have given that,  Alpha = 0.10 We know that,  For the standard normal…

Q: A coin is biased so that a head is twice as likely to occur as a tail . If a coin is tossed 3 times,

A: Given: Number of trials (n) = 3 P (Heads) = 23 P (Tails) = 13 Let X be the binomial random variable…

Q: Suppose next that we have even less knowledge of our patient, and we are only given the accuracy of…

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

Q: For a sample of 10 individuals, a researcher calculates residuals for the relationship between…

A: Residuals are the difference between the observed value and the estimated mean response and residual…

Q: a medical researcher says that less than 80% of u.s. adults think that healthy children should be…

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Q: The Fast N' Hot food chain wants to test if their "Buy One. Get One Free" program increases customer…

A: In this study, the sample of 15 customers are measure twice 'customer traffic with program in effect…

Q: Suppose the scores of students on an exam are normally distributed with a mean of 210 and a standard…

A: Given  mean of 210 and a standard deviation of 54.

Q: A sample of 137 burglaries indicated that 58 were not via an open or unlocked door or window. At the…

A: It is given that number of burglaries were not via an open or unlocked door or window (x) is 58 and…

Q: Suppose that a study was conducted to determine if there is a significant difference in the average…

A: Answer: From the given data

Q: A deck has "b" black cards and "y" yellow cards. Given that cards are drawn at a random fashion…

A: Solution: From the given information, a deck has “b” black cards and “y” yellow cards. Given that…

Q: stimator T=X/6 to estimate p. Then variance of T is

A: varT=6p1-p

Q: Suppose a sample of 830830 Americans over 4141 is drawn. Of these people, 673673 don't smoke. Using…

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Q: Suppose 84% of hypertensives and 23% of normotensives are classified as hypertensive by an automated…

A: Percentage of hypertensive is 84%. Percentage of normotensive classified as hypertensive is 23%.…

Q: If the number of pairs n = 5, coefficient of rank correlation R = - 0.5 then D will be ?

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Q: A production superintendent claims that there is no difference between the employee accident rates…

A: Given: n=100x=63α=0.05   The null and alternative hypothesis can be stated as: H0 : xE=xDH1 :…

Q: A sample of 900 commuters from New York were interviewed randomly and 416 answered they like express…

A: State the hypotheses. That is, there is no evidence to conclude that the sample evidence shows that…

Q: For the population, 57% of people are searched if stopped.  For a sample of 26441 stops, what Z-test…

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Q: The height of male students in the school is assumed to be normally distributed. 18% of the students…

A: The height of male students in the school is assumed to be normally distributed.

Q: A medical doctor claims that 40% of the patients utilize health insurance, but a social worker…

A: Given that  A medical doctor claims that 40% of the patients utilize health insurance. Claim : A…

Q: i) Estimate the average repair cost for a month and place a bound on the error of estimation ii) How…

A: Mean=25×10+10×4+6×12+12×22+8×1510+4+6+12+8=250+40+72+264+12040=74640=18.65 Standard…

Q: A researcher selected a sample of 268 former student-athletes from a list of graduates of a large…

A: Population proportion = p₀ = 0.17   Sample size = n =268 Sample proportion = p̂ =  0.14

Q: To study the correlation between the heights of fathers and sons, and sample of 900 is taken and a…

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Q: A research center claims that at least 27% of U.S adults think that the IRS will adult their taxes.…

A: Let p be the population proportion of U.S adults think that the IRS will adult their taxes. The…