A sample of 5000 people found that they walk an average of 7 km with a variance of 400. Using both the one-sided and the two-sided approach test the hypothesis that the population average is 6 km. Use 99% confidence level.

Q: A researcher studying stress is interested in the blood pressure measurements of chief executive…

A: claim : μ < 130x¯ = 122s = 18     accept Ho Reject Ho Ho True correct conclusion Type I…

Q: For normally distributed variables, approximately what percentage of values fall within two standard…

A: Given a normally distributed variable X. Let us assume its mean is µ and standard deviation…

Q: In a herd of longhern cattle the mean horn length is 52cm and h2 is 0.2. Predict the mean horn…

A: Heritability is a measure of additive effects of genes, it tells whether the observation variation…

Q: Professor Hayashi wants to see if a new Canvas Homework system has an effect on how well students…

A: Effect Size:  We want to compute the Cohen's d. The following information has been provided: Xˉ=81.7…

Q: One study claims that the variance in the resting heart rates of smokers is different than the…

A: Sample 1(smokers): n1=9s12=581.4 Sample 2(non-smokers): n2=9s22=103.8 Level of significance, α=0.05…

Q: A tire manufacturer has a 60,000 mile warranty for tread life. The company wants to make sure the…

A: Solution: Given information: n= 250 Sample size of tires x=64500 miles Sample meanμ=60000 miles…

Q: Step 5 of 5: What is the conclusion?

A: Let be the population variance.Given that,Pop. mean Pop. variance Sample size Sample mean Sample…

Q: The electric cooperative needs to know the mean household usage of electricity by its non-commercial…

A: Givenmargin of error(E)=0.09Variance(σ2)=1.96standard deviation(σ)=1.96=1.4confidence level=80%

Q: A math test uses a sample of 16 students with a mean score of 78 and another sample of 21 students…

A: Followings are the Explanation of the question  Use the two sample independent t test Given that,…

Q: 5 8 5 4 7.5 5 2.5 3.5 What are the correct hypotheses? Select the correct symbols in the order they…

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Q: In swimming, clearly you would like to swim fast, but swimming consistent times is also important. A…

A: Formula : Test statistic :

Q: A psychologist examined the effect of chronic alcohol abuse on memory. In this study, a standardized…

A: Given: µ=50 σ=6 n=22  X=47 α=0.05

Q: The cholesterol levels of adult males are approximately normally distributed with a mean of 224…

A: State the hypotheses That is, there is no evidence that the variance of the cholesterol levels of…

Q: A production engineer wants to determine if two assembly lines are producing the same mean number of…

A:

Q: Mrs. Smith’s reading class can read an average of 190 words per minute with a standard deviation of…

A: X follows a Normal distribution with mean = 190 and S.D = 18 Then z=(x-mean)/SD = (x-190)/18…

Q: avalanches studied in Canada had an average thickness of u = 67 cm. A sample of 31 avalanches in the…

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Q: You can assess normality of data using

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Q: The weight of certain mushrooms are normally distributed with a mean of 12g and a variance of…

A: Given data :

Q: Do men take a different amount of time than women to get out of bed in the morning? The 45 men…

A: We have given that,  (x-bar)1= 6.1 ,  S1= 5.6,   n1= 45 And (x-bar)2= 6,    S2= 5,        n2= 42

Q: The standard error of a 16-unit sample of a variable with a mean of 20 and a variance of 64

A: Given data,Mean μ=20Variance σ2=64standard deviation =Varianceσ=64σ=8If n=16Standard error(σx)=?

Q: A high correlation between two variables does not always mean that changes in one cause changes in…

A: Correlation,  is a statistic that measures the degree to which two securities move in relation to…

Q: As the sample size increases, standard error of the mean decreases. Explain whether or not this…

A: Given : Assertion : As the sample size increases, standard error of the mean decreases

Q: The heart rate of humans are normally distributed with a mean of 90.3 bpm and std. dev. of 7.3 bpm.…

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Q: Suppose that you were interested in investigating the effect of a drug that is to be used in the…

A: Paired test:A paired test or a dependent test statistical test that compares the averages or means…

Q: general, how is the magnitude of the standard error of estimate related to the value of the…

A: Correlation coefficient measure the degree of linear relationship between two variables

Q: researcher studying stress is interested in the blood pressure measurements of chief executive…

A:

Q: What percentage the male population is between 72 and 76 inches in height?

A: The height of men in country is normally distributed with mean of 6 feet and variance of 16 inches…

Q: What statistical tool should I use for this problem?  A graduating nursing student conducted a…

A: Test of proportion It is used to test which group have more contribution then the other. Suppose…

Q: Avalanches can be a real problem for travelers in the western United States and Canada. Slab…

A: One sample z test: One sample z test is the hypothesis test that is used to determine whether the…

Q: We want to estimate the mean distance travelled to work by employees of a large manufacturing firm.…

A: Given,standard deviation(σ)=2margin of error(E)=0.1α=1-0.95=0.05α2=0.025Z0.025=1.96   (from Z-table)

Q: Use Excel’s Data Analysis tool to conduct a multiple regression, using Risk of Stroke as the…

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Q: A sampie of 20 people has a mean age of 32 with a variance of 2. Test the hypothesis that the…

A: Given, n = 20 X¯ = 32S2=2S = 1.4142      To find, test the hypothesis that the population mean age…

Q: A researcher wants to measure average cardiovascular health of university students and compare those…

A: Solution: The researchers are interested in measure the average cardiovascular health of university…