A random sample of size 25 from a population gives the sample standard deviation to be 8.5. Test the hypothesis that the population standard deviation is 1O.

Q: A random sample of 40 students has a mean annual earnings of​ $3120 and assume that the population…

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Q: A given distribution has a population mean, μ, of 144 and a population standard deviation, σ, of 6.…

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Q: A given distribution has a population mean, μ, of 121 and a population standard deviation, σ, of 7.…

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Q: when samples of size 25 are collected from a normal population that has a mean of 100 and a standard…

A: The sample standard deviation (s) is equal to the ratio of standard deviation of the population σ…

Q: The proportion of a population with a characteristic is p= 0.35. Calculate the standard deviation of…

A: From the provided information, Population proportion (p) = 0.35 Sample size (n) = 900

Q: For a population: a. with a standard deviation of σ= 15, how large a sample would be needed to…

A: Given a) For population standard deviation of  σ= 15, standard error of 7    b) For population…

Q: If the standard deviation of a population is 20 and we take a sample of size 16 from which to…

A: Given information Standard deviation σ = 20 Sample size n = 16

Q: population with a standard deviation of 20, how large a sample is necessary to have a standard error

A: Given that  Population with standard deviation (σ) = 20   We know that  Standard error (SE) = σn…

Q: From a normally distributed population, we took a simple random sample of 700 students with a mean…

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Q: A given distribution has a population mean, μ, of 114 and a population standard deviation, σ, of 12.…

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Q: A sample size of 49 is selected from the population with a mean of 56 and a standard deviation of…

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Q: A given distribution has a population mean, μ, of 116 and a population standard deviation, σ, of 8.…

A: From the provided information,

Q: A random normal variable X has a mean of 15500 and a standard deviation of 1500. Find a value of x…

A: I am sorry, I can not provide a solution on paper. We are strictly instructed to provide a typed…

Q: A normal population has a mean of 20.0 and a standard deviation of 4.0. Compute the z value…

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Q: Assume that z scores are normally distributed with a mean of 0 and a standard deviation of 1. If…

A: Obtain the value of “a” if P(–a < z < a) = 0.4314. The value of “a” is obtained below as…

Q: Given a population distributed normally  with a mean of 81 and a standard deviation of 20, find x…

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Q: The standard deviation of the wages of 400 textile workers is $ 12.8. Another sample of 600 textile…

A: Given that  Sample size(n1) =400 Standard deviation =12.8 Sample size (n2)=600 Standard deviation…

Q: The body temperatures of a group of healthy adults have a bell-shaped distribution with a mean of…

A: Mean = 98.2 Standard deviation =0.48

Q: A random normal variable X has a mean of 15500 and a standard deviation of 1500. Find a value of x…

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Q: A simple random sample of 100 observations was taken from a large population. The sample mean and…

A: According to the given information in this question We need to find standard error

Q: A population has a standard deviation of 18 on average how much difference should exist for a random…

A: From the provided information, Population standard deviation (σ) = 18 Sample size (n) = 36

Q: The standard deviation of the wages of 400 textile workers is $. 12.8. Another sample of 500 textile…

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Q: The 2008 General Social Survey asked a large number of people how much time they spent watching TV…

A: According to the given question, The 2008 General Social Survey asked a large number of people how…

Q: An insurance agent says the standard deviation of the total hospital charges for patients involved…

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Q: The average salary for a certain profession is ​$80,000. Assume that the standard deviation of such…

A: We have to find correct answer..

Q: For a normally distributed population with a mean of 35 and a standard deviation of 7.5, what value…

A: From the given information, normal distribution with population mean as 35 and standard deviation as…

Q: A given distribution has a population mean, µ, of 110 and a population standard deviation, o, of 15.…

A: The population mean is = 110 And the SD = 15 The value of X is 140

Q: The results of a national survey showed that on average, adults sleep 6.9 hours per night.Suppose…

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Q: From a normally distributed population, we took a simple random sample of 700 students with a mean…

A: Given: n=700, x=640, σ=300 and 1-α=90%. Then,1-α=0.9⇒α=0.1   The value of z at α=0.1 is 1.645.

Q: Given a sample with a mean of 78 and a standard deviation of 14, find x such that Pr(X < x) = 0.70.…

A: We have to find x such that Pr(X &lt; x) = 0.70

Q: A sample of n = 25 scores has a mean of M = 40 and a standard deviation of s = 10. What is the…

A: Mean = 40 Standard deviation = 10 Sample size , n = 25

Q: Assume that z scores are normally distributed with a mean of 0 and a standard deviation of 1. If P(z…

A: The normal distribution is the most useful theoretical distribution for continuous variable. For the…

Q: A random normal variable X has a mean of 15500 and a standard deviation of 1500. Find a value of x…

A: Given: μ=15500 and σ=1500 Also, it is given that-PX&gt;x=PZ&gt;z=0.01…

Q: A given distribution has a population mean, μ, of 106 and a population standard deviation, σ, of 11.…

A: Mean = 106 Standard deviation = 11 Raw score = 104

Q: A given distribution has a population mean, μ, of 137 and a population standard deviation, σ, of 15.…

A: Given, μ=137 σ=15 x = 110 z=?

Q: A given distribution has a population mean, μ, of 144 and a population standard deviation, σ, of 12.…

A: A given distribution has a population mean, μ, of 144 and a population standard deviation, σ, of 12.…

Q: When samples of size 30 are collected from a normal population that has a mean of 200 and a standard…

A:

Q: A given distribution has a population mean, μ, of 142 and a population standard deviation, σ, of 10.…

A: It is given that the mean (µ) is 142 and the standard deviation (σ) is 10 and score, x is 110.

Q: The results of a national survey showed that on average, adults sleep 6.9 hours per night.Suppose…

A: (a) The mean of the samples hours that adults sleep is 6.9 hours and standard deviation is 1.2…

Q: A population has a mean of u=50 and a standard deviation of 0=10. If 3 points were added to every…

A: The properties of mean are:E(X + a) = E( X ) + a * E(X+a)=E(X)+aE(aX)=aE(X)The property of variance…

Q: you obtained a random sample of blood glucose levels from 32 individuals from a population and the…

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Q: average GPA of 2.78 with a standard deviation of 0.45.

A: Given that  GPA is normally distributed . A sample of university students has an average GPA of 2.78…

Q: When samples of size 25 are collected from a normal population that has a mean of 100 and a standard…

A: Given, n = 25 μ = 100σ = 20       To find, Sampling distribution of standard deviation?

Q: A researcher wishes to see if the average number of sick days a worker takes per year is greater…

A: From provided information, claim that the average number of sick days a worker takes per year is…

Q: A researcher wishes to see if the average number of sick days a worker takes per year is greater…

A: Hypotheses:Let µ be the true average number of sick days a worker takes per year. The aim of the…

Q: The average test scores in a Science class is normally distributed with a standard deviation of 8.…

A: Given: σ=8.2 and x=170 The value of z at 95% confidence level is z=1.96.

Q: A given distribution has a population mean, μ, of 143 and a population standard deviation, σ, of 6.…

A: we have given that  mean (μ) =143 ,standard deviation(σ)=6   and  ,   X=112 and X ~N(μ=143 ,σ^2 =36)…