The degrees of freedom for the t test for comparing two population means when the population variances are equal is:- Sample 1 N1-12 S1-3 A) 19. 19 B) 20 C) 21 D) 18.87 Sample 2 N₂-10 S2-2

Q: In an effort to counteract student cheating, the professor of a large class created four versions of…

A: a. Formula: Common population variance is obtained by pooling the sample variances given by using…

Q: The number of people in a car that crosses a certain bridge is a random variable x. The toll on the…

A: Let us denote: X= number of persons  Y= amount of money collected The fixed charge is $2. And per…

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A: Channing Tatum should use the Two Sample T-Test to determine if the average height between veterans…

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A: Given: Sample average: x¯1=1440x¯2=1490 Population variance: σ12=3632σ22=2020 Sample size :n1=n2=6 X…

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A: We have to determine which statement is true for given situation.Sample sizes n1=20 ,n2=15

Q: Which is the correct answer? The role of the covariate is to:  a.  Compare variables of interest…

A: Covariate: Covariates aredefined as the participants in an experiment. It is an independent…

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A: we have two groups one consisting of participants A, B, C, D and the other treatment is on…

Q: If you have samples of n₁ = 22 and n₂ = 19, in performing the pooled-variance t test, how many…

A: Givensample size(n1)=22sample size(n2)=19

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: illustrates the effect of sample size on the power of a two-sample t test?

A: A test of hypothesis consists of 2 hypotheses: the null, H0, and the alternative, H1.   For a sample…

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A:

Q: Samantha found that the national average for all students who feel that taking “stats” with Prof.…

A: Given: Sample size (n) = 81 Sample mean x¯ =78 Population variance σ2=25 Hypothesized mean μ=80…

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: For an analysis of variance comparing six treatment means with a separate sample of n = 7…

A: From the provided information, Number of treatment (k) = 6 Number of participants in each treatment…

Q: A value of r2=.09 is considered what for the effect size test of the percentage of variance…

A: Given, r2=0.09

Q: A sample of n = 9 has s = 3.  What are the correct values for S.S. and s2? Group of answer choices…

A:

Q: In each situation, find the value of the t-statistic for the sample mean x and give the value of…

A: The objective of this question is to calculate the t-statistic and the degrees of freedom for two…

Q: How would Interpret the following  data using two sample t-testing if unequal variances? Each of…

A: The Excel output is mentioned for two independent samples t-test assuming unequal variances. Two…

Q: Two samples, each with n = 6scores, have a pooled variance of 18. What is the estimated standard…

A: The pooled variance is 18.

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Q: An ANOVA is used to evaluate the mean differences among three treatment conditions with a sample of…

A: The given data is as follows:There are 3 groups and 12 participants are in each group

Q: For a sample of n=16 scores, how many scores are used to calculate the sample variance?

A:

Q: The number of people in a car that crosses a certain bridge is a random variable x. The toll on the…

A: Given  The random variable X denotes the number of people in a car  The toll charges: $ 5 per car…

Q: A veterinarian wanted to know if there is any difference in the average lifespan of four different…

A: Based on the results of the one-way ANOVA test, we examine the test statistic which is the…

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: The next test is a t-test for unequal variance. Here is the problem: The human resources department…

A: let cost of one bedroom apartment in NoBo  be x and SoBo y, calculate sample mean and sample…

Q: For the independent-measures t statistic, what is the effect of increasing the difference between…

A: Given:   For the independent-measures t statistic, what is the effect of increasing the difference…

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A: R-squared (R2) is a statistical measure of the goodness-of-fit for linear regression models which…

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…