A simple random sample of size nequals 40   is drawn from a population. The sample mean is found to be 106.4 ​, and the sample standard deviation is found to be 15.4 . Is the population mean greater than 100   at the alpha equals0.025   level of​ significance

Q: what is the sample standard deviation?

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Q: The mean is u: = and the standard deviation is o: =

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

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 12 for the population…

A: Givenstandard deviation(σ)=12Marign of error(E)=7c=99%α=1-0.99=0.01α2=0.005zα2=z0.005=2.5758   (from…

Q: population has a standard deviation of 18 on average how much difference should exist between the…

A: A population has a standard deviation of 18.

Q: Assume thAt scores on a standardized test are known to follow a bell shaped distribution with a mean…

A: L

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Q: A population has a standard deviation of σ = 18. On average, how much difference should exist…

A: Given data, σ = 18 n = 4   The standard error measures the distance expected on an average between…

Q: Suppose that we randomly select a sample of 80 measurements from an infinite population having a…

A: 1) Given: Mean μ=30 Standard deviation σ=5 Sample size n=80

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A: Mean=96.8 , Standard deviation=0.61

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Q: A test is made of Ho: μ = 100 vs. Ha : μ ≠ 100. Given a sample size of 100 and its mean of 97 and…

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Q: A simple random sample of 40 items resulted in a sample mean of 25. The population standard…

A: Givensample size(n)=40sample Mean(x)=25standard deviation(σ)=5

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A: Given, n=400 Mean (μ) = 610 Standard deviation (σ) = 15

Q: A sample of n=25 scores has a mean of 68. Find the z-score for this sample. If it was obtained from…

A:

Q: Suppose that among the population of smartphone owners with 16GB of storage, the mean amount of…

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A: Central Limit Theorem for mean: If a random sample of size n is taken from a population having mean…

Q: What are the mean and the standard deviation for the sampling distribution of the sample proportion?

A: Given that, Sample size (n) = 100 Population proportion (p) = 0.60 q = 1-p = 1-0.60 = 0.40 To find…

Q: n a population, the mean score on a measure of satisifaction is 50, with  standard deviation of 16.…

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Q: The average size of a farm in Texas is 185 acres. The average size of a farm in Kansas is 220 acres.…

A: Given,  x1 = 185,  n1 = 10, s1 = 40x2 = 220,  n2 = 12, s2 = 15 α = 0.05 degree of freedom, n1+n2-2…

Q: What is the ∑X for this sample

A: A sample of size is denoted by n. mean is nothing but the average of given sample observations. Here…

Q: A sample of n=25 scores has a mean of 68. Find the z-score for this sample:   If it was obtained…

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Q: minute after jogging for twenty minutes, and the average breathing rate of the second sample was 19…

A: Given that    Sample sizes n1=32      , n2=32     Sample means X̄1=21      , X̄2=19   ?1 =4.2…

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A: The random variable X is heights of the men. It is normally distributed. X~N(μ=69,σ=2.8) The sample…

Q: An ecologist is studying the impact of local polluted waters on the growth of alligators. The length…

A: Length of adult male alligators follows a normal distribution with µ and standard deviation 2. n…

Q: Suppose x has a distribution with a mean of 13.9 and a standard deviation of 2.1. Random samples of…

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Q: A population has a mean H= 157 and a standard deviation o = 27. Find the mean and standard deviation…

A: Determine the sampling distribution of the sample mean for sample of size 54. The sampling…

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A: We have given thatMean() = 60standard deviation () = 10sample size (n) = 49

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 10 for the population…

A: Given : Confidence level : 1-α=0.99 Margin of error : E=8 Population standard deviation : σ=10

Q: A simple random sample of 25 has been collected from a normally distributed population for which it…

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