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(1) If the populations are assumed to have unequal variances, we use Welch's t-test.
(2) In one-way ANOVA , if we have 4 groups of 23 people each, then we have a total of 91 degrees of freedom.
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Select the statements that are always true about two...
Which of the following statements about the one-way ANOVA are correct?
Which of the following statements about the one-way ANOVA are correct? (Select all that apply) The larger the variability within groups relative to the variability between groups, the larger the F test statistic tends to be. The results of the ANOVA F test does not tel us which groups are different or how different they are. An F-distribution is symmetrical about 0 and extends indefinitely in both directions In a one-way ANOVA, if the null hypothesis is rejected, we conclude that the population means...
In one tailed T-test, if the test statistics is
Question 2In one tailed T-test, if the test statistics is \(\mathrm{t}\) and \(\mathrm{t}_{0}\) is the t-value under null hypothesis, then \(\mathrm{p}\) -value \(=\operatorname{Pr}\left(\mathrm{t}<\mathrm{t}_{0} \mid\right.\) null hypothesis is true) if \(\mathrm{t}_{0}>0\) and p-value \(=\operatorname{Pr}\left(t>t_{0} \mid\right.\) null hypothesis is true) if \(t_{0}<0\).Question 3In a recent twin study from researchers at King's College London, the researchers wanted to first test whether identical twins show statistically significantly different thigh muscular power. To test this, they recruited 20 identical female twins. For this analysis,one-way ANOVA...
ess OY Parametric methods require mere restrictive assumptions about the level of data measurement and assumptions about the form of the probability distribution of the population. more fewer Determi...
ess OY Parametric methods require mere restrictive assumptions about the level of data measurement and assumptions about the form of the probability distribution of the population. more fewer Determine whether the following statements are true or false. False Statement If a statistical method can be used with ordinal data, it is most likely a nonparametric method. Most parametric statistical methods require the use of ordinal data. One consideration in deciding whether to use parametric or nonparametric methods is whether O...
Please help with the following multiple choice 1. In the one-way ANOVA where there are k...
Please help with the following multiple choice 1. In the one-way ANOVA where there are k treatments and n observations, the degrees of freedom for the F-statistic are equal to, respectively: a. n and k. b. k and n. c. n − k and k − 1. d. k − 1 and n − k. 2. In ANOVA, the F-test is the ratio of two sample variances. In the one-way ANOVA (completely randomized design), the variance used as a numerator...
Statistics for math test scores of two Grade 3 classes were computed. Class 1 n: 21...
Statistics for math test scores of two Grade 3 classes were computed. Class 1 n: 21 mean: 72 variance: 4.5 Class 2 n: 25 mean: 65 variance: 7.3 The principal wants to conduct a t-test (=0.05) to compare performance of these two classes. Which of the following is true? A. This is a one-tailed test with equal variances B. This is a two-tailed test with unequal variances C. This is a one-tailed test with unequal variances D. This is a...
please give correct and answer all question.. this is revision question... 14. Which of the following...
please give correct and answer all question.. this is revision
question...
14. Which of the following statistical tests is BEST TO normally distributed data? in statistical tests is BEST to use for comparing two samples A. Independent sample t-test B.Mann-Whitney test C. Regression analysis D. Logistic regression analysis 15. Which of the following is NOT related to central limit theoret? sample size is large. bution of sample mean, x is approximately normal regardless of Xin the population 9. The mean...
Select the false statement about ANOVA. A one-way ANOVA hypothesis test considers comparisons between populations based...
Select the false statement about ANOVA. A one-way ANOVA hypothesis test considers comparisons between populations based on one characteristic, while a two-way ANOVA hypothesis test considers comparisons between populations based on multiple characteristics. If a researcher wants to study the effectiveness of three brands of nicotine patches, the researcher should use a One-Way ANOVA test. If a researcher wants to compare the mean wages of females in different age groups at a particular company, he or she should not use...
The following data represent the results from an independent-measures study comparing two treatment conditions. Treatment Treatment...
The following data represent the results from an independent-measures study comparing two treatment conditions. Treatment Treatment One Two 2.5 7.2 5.2 7.6 5.8 4.4 6.3 4.5 4.7 5.2 4.8 3 Using technology, run the One-way ANOVA Test for this data: F-ratio: p-value: Now, run the Two Independent Sample t test on the same data: Note: Do this with "pooled variances" since one assumption we make with ANOVA is that the variances for each group are equal. t-statistic: p-value: Do you...
For each of the following statements, are they true or false? a. (1) The covariance and...
For each of the following statements, are they true or false? a. (1) The covariance and correlation between two variables X and Y will always have the same sign. b. (1) Suppose X follows an exponential distribution. If we take samples of X of size n=50, then # should also follow an exponential distribution. C. (1) Suppose in a hypothesis test that the null hypothesis is rejected at a significance level of a = 0.05. All else being equal, the...
Which of the following is about F-test is NOT true? Group of answer choices a. F-test...
Which of the following is about F-test is NOT true? Group of answer choices a. F-test is used to test whether two independent populations have the same mean. b. F-test is used to study the variances of two populations in order to test the assumption of equal variances c. The test statistic for F-test follows F distribution d. The lower-tail critical value of the F distribution FL is computed by taking the reciprocal of FU.
Question 2In one tailed T-test, if the test statistics is \(\mathrm{t}\) and \(\mathrm{t}_{0}\) is the t-value under null hypothesis, then \(\mathrm{p}\) -value \(=\operatorname{Pr}\left(\mathrm{t}<\mathrm{t}_{0} \mid\right.\) null hypothesis is true) if \(\mathrm{t}_{0}>0\) and p-value \(=\operatorname{Pr}\left(t>t_{0} \mid\right.\) null hypothesis is true) if \(t_{0}<0\).Question 3In a recent twin study from researchers at King's College London, the researchers wanted to first test whether identical twins show statistically significantly different thigh muscular power. To test this, they recruited 20 identical female twins. For this analysis,one-way ANOVA...
ess OY Parametric methods require mere restrictive assumptions about the level of data measurement and assumptions about the form of the probability distribution of the population. more fewer Determine whether the following statements are true or false. False Statement If a statistical method can be used with ordinal data, it is most likely a nonparametric method. Most parametric statistical methods require the use of ordinal data. One consideration in deciding whether to use parametric or nonparametric methods is whether O...
please give correct and answer all question.. this is revision
question...
14. Which of the following statistical tests is BEST TO normally distributed data? in statistical tests is BEST to use for comparing two samples A. Independent sample t-test B.Mann-Whitney test C. Regression analysis D. Logistic regression analysis 15. Which of the following is NOT related to central limit theoret? sample size is large. bution of sample mean, x is approximately normal regardless of Xin the population 9. The mean...
The following data represent the results from an independent-measures study comparing two treatment conditions. Treatment Treatment One Two 2.5 7.2 5.2 7.6 5.8 4.4 6.3 4.5 4.7 5.2 4.8 3 Using technology, run the One-way ANOVA Test for this data: F-ratio: p-value: Now, run the Two Independent Sample t test on the same data: Note: Do this with "pooled variances" since one assumption we make with ANOVA is that the variances for each group are equal. t-statistic: p-value: Do you...
For each of the following statements, are they true or false? a. (1) The covariance and correlation between two variables X and Y will always have the same sign. b. (1) Suppose X follows an exponential distribution. If we take samples of X of size n=50, then # should also follow an exponential distribution. C. (1) Suppose in a hypothesis test that the null hypothesis is rejected at a significance level of a = 0.05. All else being equal, the...
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