What is the probability that the mean of a sample with 40 elements randomly selected from a normally distributed population with a mean of 80 and a variance of 600 is greater than 70?

Q: If y = {12, 3, 6, 6, 19, 5, 7, 2, 4, 6} is a population of scores then: The variance =…

A: From the provided information,The data values are as follow:y = {12, 3, 6, 6, 19, 5, 7, 2, 4, 6}n =…

Q: Suppose a population has three values 13, 17 and 24. What is its variance?

A: Given: n=3 The mean of the data is obtained as below: Mean=∑xn=13+17+243=543=18 The mean is 18.

Q: A sample of 6400 cases is drawn at random from a large population. The Variance is 100. Calculate…

A: Sample size, n = 6400 Variance = 100 Standard deviation = VarianceStandard deviation = 100Standard…

Q: A study compared physical activity among 4 different professions.   A total sample size of 32…

A: Provided : Number of different groups , K = 4 Total sample size , N = 32 Members in each group = 8…

Q: The data from an independent-measures research study produce a sample mean difference of 4 points…

A:

Q: 2) If all of the values in a set of data were doubled, what would happen to the variance?

A: We need to use the concept of variance.

Q: Suppose that 10 observations are drawn from a normal population whose variance is 64. The…

A: Given that the population variance is 64. Sample size is 10. σ2=64n=10 Claim: There is enough…

Q: ) If the probability of a student receiving financial aid is 0.72, find the mean and variance of the…

A: Given: probability of a student receiving financial aid is 0.72 p=0.72 number of students(n)=40000

Q: Show that X is a sufficient estimator of the mean u of a normal population with the known variance…

A: X~N(μ,σ2)

Q: What formula is used to calculate the sample variance?

A:

Q: A sample of final exam scores is normally distributed with a mean equal to 20 and a variance equal…

A:

Q: When is the population standard greater than the population variance?

A: Variance: The variation between each observation from its mean is known as variance. The greater the…

Q: An organizational psychologist measures levels of job satisfaction in a sample of 30 participants.…

A:

Q: If a set of data is normally distributed with a mean of 20 and a variance of 16, a z-score of -3.8…

A: Let raw score is X.  Then Z Score is given by, Z= (X- mu)/sigma Where mu is mean  And sigma  is…

Q: what happens to the F-statistic if two variances are different?

A: The two variances are different hence the F-statistic are as follows,

Q: what test is used to determine whether two population means are different when the variance are…

A: The test that is used to determine if the two population means are different when the population…

Q: what test is used to determine whether two population means are different when the variance are…

A: Solution :  when the variance are known and sample size is large then we use z test to determine…

Q: What does it mean that the variance (computed by dividing by N) is a biased statistic?

A:

Q: DESA Early Childhood researcher published that 5% of all births by university student’s result in…

A: From the provided information, DESA Early Childhood researcher published that 5% of all births by…

Q: Suppose that the City of Chicago is interested in potential revenues if they introduce a tolling…

A: Here the given information is Suppose that the City of Chicago is interested in potential revenues…

Q: A Random Sample Of Size 25 Is To Be Selected From A Normal Population Having A Mean Of 81 And A…

A: Given that Population mean=81 Variance =9

Q: Describe a scenario where a researcher could use an F-test for the equality of two variances to…

A: F-test can be used when we are given two groups and we want to compare the differences in the…

Q: Show that the variance of a weighted sum of uncorrelated random variables equals the weighted sum of…

A:

Q: Suppose a sample 30 observations is drawn from a population with variance population with variance…

A:

Q: A researcher is interested whether a new drug is effective in changing patients' cholesterol levels.…

A: State the hypotheses. That is, the patients in different groups have similar average cholesterol…

Q: Suppose that 90% of Narnians are children, that Narnian children have normally distributed BMIs with…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a…

Q: the homogeneity of variances assumption states that the variance in the two samples must be equal?…

A: Homogeneity of variances always make about the population variance not about sample.

Q: If the sample variance for y1 = {-2, 7,9,13,16,0,15,6} is 44, what is the variance of y2 = 3.8 * y1?…

A: SOLUTION:- Given data for sample variance y1={-2, 7,9,13,16,0,15,6}=44…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.