8) Research of selling prices for used two-year-old Corvette reveals that they have a standard deviation of $2157 (based on data from Edmunds.com). How many selling prices must you obtain in order to estimate the mean selling price of these cars? Assume that you want 98% confidence that your sample mean is within $250 of the population mean. (you need to find the sample size).

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A: Given : Population mean = μ = 600000 Sample mean =  = 612000 Sample mean = 40 Standard deviation = σ…

Q: Given a sample data set with a Variance of 6.25, what is the Standard Deviation of the data set.?

A: Given, Variance=6.25 sd=?

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A: From the provided information, The mean and standard deviation for the sales from China is as…

Q: An insurance company is reviewing its current policy rates. When originally setting the rates they…

A: we have given that n=40 ,mu=1800 , xbar=1950 and sigma=500 , alpha =0.05

Q: What does Chebyshev’s rule say about the percentage of observations in any data set that lie within…

A:

Q: The results of a statewide exam for assessing the mathematics skills of realtors were normally…

A: a. The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the…

Q: What is the standard deviation for the following sample of scores? Scores: 3,2,4,6,6,3

A: The standard deviation is a measure of dispersion. It tells how much data are deviates from their…

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A: d) The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the…

Q: A motor club wishes to estimate, to within five cents, the mean price of a gallon of gasoline in a…

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A: The sampling distribution of sample mean follows the normal distribution, if the population is…

Q: (a) How many reams should the manager expect to use each day? (b) What is the standard deviation of…

A: here given Discrete probability Distribution of X  X=  no of reams of paper Used

Q: a. What is the difference between carrier's highest data speed and the mean of all 50 data speeds?…

A: Here Given  Highest Speed measured=76.6 Mbps Sample Size=50 Sample mean=x¯=18.68 Sample sd= s= 37.17…

Q: In 1955, Life Magazine reported that the 25 year-old mother of three worked, on average, an 80hour…

A: Solution: Given information: n= 85 Sample size  x= 83.5 Sample mean μ= 80 Populaion Mean s= 10…

Q: You may need to use the appropriate technology to answer this question. Suppose Michigan State…

A: Givensample size(n)=100Mean(x)=51286standard deviation(s)=5200α=0.01

Q: What does Chebyshev’s rule say about the percentage of observations in any data set that lie within…

A:

Q: Does the sample size n affect the standard deviation of all possible sample means? Explain your…

A: According to central limit theorem, for large sample (>30) or if the population follows normal…

Q: 1. The average grade of 2nd year students majoring in Civil Engineering is normally distributed with…

A: NOTE- AS PER POLICY I HAVE CALCULATED FIRST MAIN QUESTION ONLY      Here Given For  Civil…

Q: The Cpa practice advisor reports that the mean preparation fee for 2017 federal income tax returns…

A: From the provided information, Mean (µ) = $273 Standard deviation (σ) = $100 X~N (273, 100) Here X…

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A: Obtain the score that does a realtor need in order to receive a certificate. The score does a…

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Q: Consider a dataset with standard deviation 2, mean 6.2, and a total of 186 data points. What is the…

A: The given data is - Standard deviation (σ)=2 Mean(x)=6.2 Sample size(n)=186

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A:

Q: An evaluation team set out to survey the cost of malaria drugs in two urban areas. The following…

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Q: 16 The sample standard deviation is an unbiased estimator of the population standard deviation. True…

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Q: 1. The standard deviation provides an overall measurement of how much participants' scores differ…

A: Given data: The standard deviation provides an overall measurement of how much participants' scores…

Q: Assume the sample standard deviation is s=10, what do you conclude?

A: here given, sample mean = 87 n = 25 sample standard deviation  = 10

Q: if the sample mean is 10, the population standard deviation is 20, and the sample size is 25, then…

A:

Q: A travel agency wishes to estimate, at 99% confidence and to within $100, the mean airfare for…

A: According to the given information, we have Standard deviation = $275 Margin of error = $100…

Q: The following are total cholesterol scores measured in 10 patients who are participating in a study…

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A: We have to find correct answer for given data..

Q: The results of a statewide exam for assessing the mathematics skills of realtors were normally…

A: Given, The results of a statewide exam for assessing the mathematics skills of realtors were…

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A:

Q: 2. A university dean wishes to estimate the average number of hours his part-time instructors teach…

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Q: Please answer the last part of C:

A: The mean difference is $850 and the sample deviation is sd is $1,123.

Q: Allan, a Grade 12 senior high school student, wants to estimate the average number of students who…

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Q: 7. A set of data has a variance of 81. What is the standard deviation?

A:

Q: The results of a statewide exam for assessing the mathematics skills of realtors were normally…

A: Let us assume: X=the result of statewide exam for assessing the mathematics skills of realtors.…

Q: Does the sample size ? affect the standard deviation of all possible sample means? Explain your…

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Q: The sample standard deviation is a measure of what?

A: The sample standard deviation is a measure of spread of scores within a sample data.

Q: 12.What is the sample size needed if the margin of error is 30 and the standard deviation of 45 with…

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Q: i. What are the mean and standard deviation of the total amount of milk and flour in Jim's…

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Q: If the population standard deviation is 20 and the sample size is 25, then what is the value of the…

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Q: Please answer the last part of letter C:   Answers: 498 and 1200 does not work 499 and 1200 does not…

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Q: The providence health maintenance organization wants to establish a criterion for recommending…

A: Given Information Mean (µ) = 178.1 Standard deviation (σ) = 40.7

Q: The following are grade point averages measured in a sample of 8 undergraduate students who are…

A: Solution: Let X be the grade point average. The given data is 3.28, 2.97, 3.05, 3.61, 3.39, 2.95, 3…

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A: Data Given: The arrival Rate is 10 minutes. Service Time is 5 minutes.

Q: A college admissions officer believes that students enrolling from Shawnee school District have…

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Q: 3. An extensive study of the cost of health care in the United States presented data showing that…

A: