In practice, when comparing two means using small samples, when would you recommend assuming equal variances? A. Never B. Always C. Every time it is supported by the t-test D. Every time it is supported by the F-test

Q: A real estate company is interested in testing whether the mean time that families in Gotham have…

A: Solution: Given information: nG= 100 Sample size of Gotham families nM=150 Sample size of Metropolis…

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: If the Mean of a data set is 700 and the Variance is 49; Calculate the intervals used for the…

A: Given information, Mean of a data set = 700 Variance = 49 We have to calculate intervals using…

Q: John wants to compare two means. His sample statistics were x, = 22.7, s, = 5.4, n, = 9 and x2…

A: We have given that  Sample size n1=9 , n2= 9 Sample mean xbar1 =22.7 , xbar2 = 20.5 s12=5.4 ,…

Q: You assume equal variances in a two-sample t-test. n1 = 12 and d.f. = 18. What is n2?

A: It is given that n1 =12 and df =18.

Q: An analysis of variances produces dfnetween= 3 and dfwithin = 24. If each treatment has the same…

A: Given that,dfbetween = 3dfwithin = 24Each treatment has the same number of participants.

Q: The researchers want to determine if there is a significant difference between the academic…

A: Given that  For Male  Sample size (n1)=6 Sample Mean (x̄1)=89.5 Sample variance (s12)=30.2 For…

Q: To calculate the F statistic    A. The MSE and SST is important  B. The pooled variances is…

A: Given that  MSE = Mean Sum of  Square of Error SST = Sum of Square of Treatment  dfT = Degree of…

Q: A sample of 46 observations gave sample mean 20 and coefficient of variation 0.6 Then the sample…

A: Given  n=46, Xbar=20, CV=0.6

Q: A researcher has collected the following sample data: 3, 5, 12, 3, 2. The mean of the sample is 5.…

A:

Q: In a random sample of 1000 B.Com students, 125 said that they wanted to become Statisticians. Assume…

A:

Q: Suppose the variance of X is 33. What is the variance of .23X?

A: Given,Var(X)=33 we know that Var(ax)=a2Var(X)

Q: The Pearson correlation is valuated for a sample of n=32 individuals.If a hypothesis test is used to…

A: we have to find out  degree of freedom  for  t test statistics  here given that the test  the…

Q: What is the variance of the following data( 1, 2, 3, 4, and 5)?

A: According to the given information in this question We need to calculate the value of variance

Q: at is the assumption of homogeneity of variance? Select all tha The standard deviations for the two…

A: The assumption that two populations have the same variances is called the assumption of the…

Q: A random sample of size 16 is to be taken from a normal population having mean 100 and variance 4.…

A: Sample size = 16 Mean = 100 Variance = 4

Q: 2. Two stores at SM Downtown are selling batteries for cell phones. Store A claims an avera battery…

A: Given : Store A claims an average battery life of 12 hours. Store B claims an average battery life…

Q: There are two samples with means 15 and 17. Both of those samples consist of 24 observations. Sample…

A: Given Data : For Sample 1 x̄1 = 15.0 s1 = 2.0 n1 = 24 For Sample 2…

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: Suppose that you want to perform a hypothesis test based on independent random samples to compare…

A:

Q: A yogurt producer claims the variance on their yogurt containers is 4 grams or less .A sample of 30…

A: We have to find correct option..

Q: One sample has n=7 and SS=35 and a second sample has n =17 and SS =45. What is the pooled variance…

A: Given information: The two sample statistics is given as, Sample 1 n1=7SS1 = 35 Sample 2 n2 = 17SS2…

Q: A plant pathologist wants to compare two strains of bacteria in terms of its reproduction rate. Test…

A: Here we have to test a plant pathologist wants to compare two strains of bacteria in terms of its…

Q: The best way to reduce the variances in the distributions of means when conducting a t test for…

A: The sample size would be in the denominator of the formula for variance of distribution of means.…

Q: Suppose the variance of X is 14. What is the variance of .47X?

A: The objective of this question is to find the variance of a random variable that has been scaled by…

Q: The one-sample chi-square focuses on the distribution of two variables.

A: The one-sample chi-square focuses on the distribution of two variables.

Q: Suppose that the variance of the sample mean is equals 25 and the sample size is 6 . then the…

A:

Q: Which of these experimental designs has the most statistical power (is more likely to show a true…

A: A) Between Subjects  has more statistical power than the rest

Q: Post-hoc tests are necessary for an analysis of variance comparing only two treatment conditions.…

A: When we know that there is a statistical significant difference between mean of groups, In order to…

Q: It is not essential to know the value of the population variances to test for the equality of two…

A: Solution To test the equality of means the F test is used .

Q: A traffic officer suspects that the mean number of car accidents every week is 4. A sample of 16…

A: Given,  n = 16 μ = 4x¯ = 7σ = 4α = 0.05

Q: What is the proportion of variance shared between the 2 variables? (How much of the variance in one…

A: Given The data is as follows: Mean 1 = 13.6 SD 1 = 2.26 Mean 2 = 102.7,SD= 11.36 Coefficient r =…

Q: HYPERTENSION. The data below was collected from over 200 infants at 1 month of age. In this study a…

A: Let quiet sleep and awake and quite sleep are sample 1 and 2 respectively. 1. As population standard…