A survey is planned to determine the mean annual family medical expenses of employees of a large company The management of the company wishes to be 95% confident that the sample mean is correct to within +$75 of the population mean annual family medical expenses. A previous study indicates that the standard deviation is approximately $404. a. How large a sample is necessary? b. If management wants to be correct to within +$15, how many employees need to be selected?

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A: Given, If the average weight of pigs in PigglyWiggly, Pennsylvania is 221.4 pounds with a standard…

Q: According to the Empirical rules rule, if there are 500 observations in a mound shaped data set the…

A: The empirical rule, also referred to as the three-sigma rule or 68-95-99.7 rule, is a statistical…

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A: The P-Value is .076574.The result is significant at p < 0.10.

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Q: a. A student whose grade is 83 would be at the 19th percentile. b. A student whose grade is 90 would…

A: According to our guidelines, we can answer only three subparts, so please repost the rest parts.

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Q: A data set has a mean of 60.4 and a standard deviation of 5.2    Is a value of 45 unusual? Is a…

A: From the provided information, Mean (µ) = 60.4 Standard deviation (σ) = 5.2 X~N (60.4, 5.2)

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A: Given :Population standard deviation = 2.8 daysCompany wants to be 95% confident that the true mean…

Q: A nutritionist claims that the mean tuna consumption by a person is 3.1 pounds per year. A sample…

A: Solution: Let X be the tuna consumption by a person. From the given information, n=90, x-bar=2.9 and…

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A: Introduction: The 100 (1 – α) % confidence interval for the population mean, μ, when the population…

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A: From the provided information, Sample size (n) = 200 Sample mean (x̅) = $34000 Population standard…

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Q: 30.To see if young men ages 8 through 17 years spend more or less time than the national average of…

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A: From the provided information, Population standard deviation (σ) = $15.25 Confidence level = 95%…

Q: Q4: A job placement director claims that the average starting salary for nurses is $24000. A sample…

A: According to the provided information,

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Q: b) The American Automobile Association reports that the average time it takes to respond to an…

A: Given  μ=38, σ=9.002 and n=80

Q: Suppose that the lengths of human pregnancies are normally distributed with a mean of 266 days and a…

A: GivenMean(μ)=266standard deviation(σ)=17

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A: It is given that Power of test = 0.812

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A: The display shows the normal curves for A and B in same number line.

Q: A scientist has read that the mean birth weight, μ, of babies born at full term is 7.3 pounds. The…

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A: From the given information, the mean is 15.90 and standard deviation 1.50.

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A: Givenstandard deviation(σ)=0.5x=13 ounces

Q: If the average weight of pigs in PigglyWiggly, Pennsylvania is 221.4 pounds with a standard…

A:

Q: A manager is interested in finding the average number of sales per day at a sporting goods store. If…

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Q: 2. The height of an adult male is known to be normally distributed with of mean of 69 inches and a…

A: X~N( μ , ?^2 )    μ =69     , ? = 2.5   Z-score =( x - μ )/?

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Q: The average student loan debt for collge graduates is$25,950. Suppose that that distribution is…

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Q: Suppose that the mean cranial capacity for men is 1170 cc (cubic centimeters) and that the standard…

A: (a) Given that, the value of mean is μ=1170 and standard deviation is σ=300 cc. Use the Empirical…

Q: A nutritionist claims that the mean tuna consumption by a person is 3.3 pounds per year. A sample of…

A: (a) Let μ denotes the population mean tuna consumption. The claim of the test is that the mean tuna…

Q: In order to set rates, an insurance company is trying to estimate the number of sick days that full…

A: Margin of error(E)=1 day Population standard deviation(σ)=2.8 days at confidence level 95%,…

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A: Solution

Q: Suppose that the lengths of human pregnancies are normally distributed with a mean of 267 days and a…

A:

Q: A marketing consultant is hired by a major restaurant chain wishing to investigate the preferences…

A: We have given that  Sample size n =25  Sample mean =14.50 Standard deviation =3.50

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Q: 1. A rental car company claims the mean time to rent a car on their website is 60 seconds with a…

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Q: Suppose that the mean cranial capacity for men is 1040 cc (cubic centimeters) and that the standard…

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Q: A nutritionist claims that the mean tuna consumption by a person is 3.5 pounds per year. A sample of…

A: (a) Let μ is defined as the population mean tuna consumption by a person. The claim of the test is…

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Q: Sixteen percent of the world's population is left-handed. A researcher claims that left-handed…

A: a) mean (p) = 0.16 , q = 1 - 0.16 = 0.84 , n =2100

Q: A marketing consultant is hired by a major restaurant chain wishing to investigate the preferences…

A: In the given scenario the hypothesis test was done to determine if we have sufficient evidence to…