A sample of 20 third-grade students had a average of 54 on a math proficiency test, with a sample standard deviation of 11. Is there enough evidence to conclude that the third-grade sample mean differs significantly from the third-grade population mean of 67?   Assume a 0.02 significance level.  Use the Critical Value Method of Testing

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A: We have given that  Sample size n =67 Sample mean =5.8  Standard deviation =0.6 NOTE:- According to…

Q: A recent national survey found that high school students watched an average (mean) of 7.2 movies per…

A:

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A: Introduction - z-score  z=x-μσwhere ,x=score σ=standard deviation μ=mean

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A: Given  Xbar=149 sigma=36.8 , n=35 alpha=0.10 H0:mu=130  Vs   H1:mu>130 Critical value=1.28

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Q: pg. You suspect that the mpg is more for your car. The 43 trips on the highway that you took…

A: given   mean  of population   μ =32    ,  σ =5.5 sample size  n = 43  trips     sample mean  = x¯ =…

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A: Given that sample size =30 α=0.05 sample mean = 7.3 Population standard deviation = 0.5

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A: a. Here, the sample size is greater than 30 and the population standard deviation is known. So, it…

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A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want…

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A:

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A: State the appropriate hypothesis:Denote the population mean weight of meatballs as μ.The chef claims…

Q: What would be your decision concerning the null hypothesis?

A: Consider that the population mean oxygen uptake of healthy women is denoted by .Hypothesized value…

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A: Given n=19, x=22.9, s=9.5, μ=25.2,α=0.05

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Q: 3. The Metropolitan Bus Company claims that the mean waiting time for a bus during rush hour is less…

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A: We have given that  Claim : population average differs from 67. sample size = n =100…

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A: Sample sizes n= 64   Sample means X̄= 264   Sample standard deviation = 50.3

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A: Given Information :  According to the National Association of Realtors, it took an average of three…

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A: Given, μ=72  n=100x=76σ=19

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A: Givensample size(n)=30Mean(x)=24standard deviation(s)=5significance level(α)=0.05

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A: From the provided information, Population mean (µ) = 4 oz Population standard deviation (σ) = 0.22…

Q: With the data collected, Dr Tian ran a test to see if there was a significant difference in the mean…

A: Given, the data set is: For male: n1 = 15x¯1 = 4.66s1 = 1.676   For Female, n2 = 15x¯2 = 3.63s2 =…

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A: (a)   Determine the type of study.   The type of study is determined below as follows:   Since, the…

Q: The average American consumes 91 liters of alcohol per year. Does the average college student…

A: a.   Assume that μ is the population average consumption of alcohols for all Americans.

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A: So we have population mean μ=190 and the researcher claim is that the average IQ score for students…

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A: The null hypothesis is actually false.Type 2 error is not rejecting the false null hypothesis.

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A: As per honor code, we will only answer first three parts: a) Null hypothesis: H0:…