m one sample of 8 observations the sum of the squares of deviations of the sample values from the sample mean was 84.4 and in the other sample of 10 observations it was 102.6. Test whether the difference is significant at 5% level.

Q: Suppose a variable is Normally distributed with μ=345 and \sigma σ=30. What proportion of the data…

A: Mean(µ) = 345Standard deviations (σ) = 30X ~ N (µ, σ )= N(345, 30)

Q: A sample of n=5 scores has a mean of x=9. what is Ex for this sample?

A: Mean = 9 n = 5

Q: The sum of the squared deviation scores is SS = 20 for a population of N = 5 scores. What is the…

A:

Q: If the t-statistic for a variable is -1.74, is the variable statistically significant? No Yes

A: Given: Test statistic is -1.74

Q: What is the residual sum of squares around the fit for a dataset with an r^2 of 1?   If the sum of…

A: We know  R2=Explained sum of squaresTotal sum of squares⇒1=Explained sum of squaresTotal sum of…

Q: A population with a mean of µ = 15 has 40 scores. What is X?

A:

Q: The population standard deviation for the heights of dogs, in inches, in a city is 3.7 inches. If we…

A: It is given that confidence level is 0.95, population standard deviation is 3.7, and the margin of…

Q: Hello. I appreciate any help. Thanks.

A: Standard Error of estimate:S=√MSEMean square error:The formula for the mean square error is,MSE =…

Q: A population has a mean of 75 and a standard deviation of 15. You randomly sample nine people from…

A: Given information Mean (µ) = 75 Standard deviation (σ) = 15 Sample size = 9 Sample mean = 80 z score…

Q: Q4. The standard deviation of the temperature in a large refridgeratored room should not exceed…

A:

Q: A sample of n=8 scores has a mean of M=7. If one score is changed from X =20 to X =4, what is the…

A: Consider the first 7 scores is x1, x2, x3, x4, x5, x6, x7 and the 8th score is, x8=20. The formula…

Q: A sample of n=7 scores has a mean of M=9. If one new person with a score of X=1 is added to the…

A: Sample of n = 7 scores has a mean of M = 9. We know that, Mean =Sum of observationsTotal number of…

Q: A study of commuting times reports the travel times to work of a random sample of 20 employed adults…

A: Given information- Sample size (n) = 20 Sample mean x̅ = 31.25 minutes Sample standard deviation (s)…

Q: The data for an independent –measures research study produced a sample mean difference of 6 points…

A: Following information is given:

Q: A researcher calculates the variance of her sample to be s = -6. , what would you tell the…

A: Here's the explanation for this as follows; The sample variance, s², is used to calculate how varied…

Q: A score that is 3 points lower than the sample mean has a z-score of z = -0.25, and a score of X =…

A: Given information: Case-1: z = -0.25  Score (X) = u-3  Sample mean (u) = u  Case-2: z = -0.75  X =…

Q: A random sample of 49 shoppers showed that they spend an average of $23.45 per visit and the…

A: 1. Point estimate of the population mean is the sample mean.

Q: In a population of exam scores, a score of X = 88 corresponds to z = 2 and a score of X = 79…

A: From the provided information, A score of X = 88 corresponds to z = 2 A score of X = 79 corresponds…

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

A: It is given that, Sample mean = 25. Population standard deviation, σ is 5. The sample size, n is 40.…

Q: A sample of n = 5 scores has a mean of X-bar = 9. What is ∑X for this sample?

A: From the provided information, Sample size (n) = 5 Mean (x̅) = 9

Q: We learned in class that when dealing with small samples, we use df = n-1 to calculate the sample…

A: To calculate standard deviation , we use sample mean value or population mean value depending on the…

Q: A population of N= 23 scores has a mean of u = 5. After one score is removed, the mean is found to…

A: Given that - A population of N= 23 scores has a mean of u = 5. After one score is removed, the mean…

Q: A small pilot study was conducted to compare cholesterol levels in individuals before and after a…

A: Preliminary calculation:Using the EXCEL formula “=NORM.S.INV(1– (0.05/2))”, the z-value for 95%…

Q: A sample of n = 10 scores has a mean of M = 3. What is ΣX for this sample?

A: The general formula for the sample mean is given below:

Q: For a random sample of 36 data pairs, the sample mean of the differences was 0.75. The sample…

A:

Q: The scores in a high school are normally distributed with a variance of 225. Suppose that 27.43% of…

A: Normal Distribution: A continuous random variable X is said to follow Normal distribution with…

Q: A random sample of 525 people was taken from a very large population. 225 of the people in the…

A:

Q: Samuel Morse determined that the percentage of a's in the English language in the 1800s was 8%. A…

A: Denote p as the true proportion of a’s in modern newspaper. It is reported that proportion of a’s in…

Q: A variable of a population has a mean of µ = 100 and a standard deviation of σ = 28. a. Identify the…

A: a.Sampling distribution of a sample mean:

Q: Two independent samples each have n = 4 scores. If the first sample has a sum of squares of 30 and…

A:

Q: A population of N= 10 scores has a mean ofµ=6. After one score is removed, the mean is found to be…

A:

Q: The scores on a standardized mathematics test for 8th grade children in New York State for a normal…

A: Given Information:  Population mean (u) = 70  Standard Deviation (s) = 10

Q: In a population with a μ = 8, a score of X = 3 corresponds to z = –2.5. What is the standard…

A: Mean = 8 Raw score , X = 3 Z score = - 2.50

Q: For sample with a mean M = 76, a score of X = 72 corresponds to a z score = -0.50. The sample…

A: Given: Sample mean (M) = 76 Raw score (X) = 72 Sample standard deviation (s) = 8 Formula:

Q: A population is normally distributed with µ = 145 and σ = 20. Which is the percentile rank for X =…

A:

Q: A sample of 30 distance scores measured in yards has a mean of 7, a variance of 16, and a standard…

A: Given statistics:Consider the variable x represents the distance scores in yards.The given…

Q: The data from an independent-measures research study produce a sample mean difference of 6 points…

A:

Q: For a sample of n = 20 scores, X = 25 corresponds to z = -1.20 and X = 40 corresponds to z = +1.80.…

A:

Q: he scores on a standardized mathematics test for 8th grade children in New York State for a normal…

A: mean = 70 standard deviation = 10 a. What proportion of the students in the state have scores less…

Q: A sample of n=11 scores has a mean of M=9. If one new person with a score of X=4 is added to the…

A: Given that, A sample of n=11 scores has a mean of M=9. One new person with a score of X=4 is added…

Q: he population standard deviation for the heights of dogs, in inches, in a city is 3.7 inches. If we…

A: Given :  The population standard deviation for the heights of dogs, in inches, in a city is 3.7…

Q: The data from an independent-measures research study produce a sample mean difference of 6 points…

A: From the provided information, Mean difference = 6 Standard error (SE) = 2 Sample size (n) = 8

Q: Which of the following samples would have the largest standard error of the mean

A:

Q: A sample of n = 5 scores has a mean of M = 12. If one person with a score of X = 8 is added to the…

A: Given n = 5 mean = 12

Q: After 3 points have been added to every score in a sample, the mean is found to be M= 83 and the…

A: After 3 points have been added to every score in a sample, the mean is found to be M= 83. The value…

Q: A sample of n = 5 scores has a standard deviation of s = 5. What is the value of SS, the sum of the…

A: Given Information: n = 5  s = 5

Q: What percent of our campus is female? If no preliminary study is made to estimate, how large a…

A:

Q: A sample of N = 9 individuals participates in a repeated measures study that produces a sample mean…

A: The hypotheses are given below: Null hypothesis: H0:μd=0 Alternative hypothesis: H1:μd>0 The…

Q: A variable of a population has a mean of μ = 100 and a standard deviation of σ = 28. a. Identify the…

A:

Q: A sample of n = 5 scores has a mean of M = 8. if one new score with a value of X = 2 is added to the…

A: