A researcher is using a dependent t-test to evaluate the difference between two treatments. If the difference between the treatments is consistent from one participant to another, then the data should produce ______.
a large variance for the difference scores and a small standard error
a large variance for the difference scores and a large standard error
a small variance for the difference scores and a small standard error
a small variance for the difference scores and a large standard error
The paired t-test is used to evaluate the difference between the two treatments.


the difference between the treatments is consistent from one participant to another. For this T statistics would be larger which means SE(d-bar) would be smaller so will be standard deviation (variance) of the difference scores.
So, option c Is correct.
A researcher is using a dependent t-test to evaluate the difference between two treatments. If the...
For either independent-measures or repeated-measures designs comparing two treatments, the mean difference can be evaluated with either at test or an ANOVA. The two tests are related by the equation F=12. The following data are from a repeated-measures study: Person Difference Scores 3 I 4 2 3 7 M = 4.00 T = 16 SS = 14 Treatment II 7 11 6 10 M 8.50 T-34 SS = 17 3 3 Mo 4.50 SS = 27.00 Use a repeated-measures t...
A researcher conducts a study in which the population variance of difference scores between two groups is unknown. What type of t-test is most appropriate for this study? Question 6 options: one–independent sample t-test two–independent sample t-test related samples t-test There is not enough information to answer this question.
Which of the following is a key difference between the t test and the z-test? a. The t test requires the knowledge of the true population mean. b. The t test uses the sample variance in place of the population variance. c. The t test computes the standard error using the population standard deviation. d. All of these are differences between t and z.
A colleague proposes to you that a one-sample t-test should be used to evaluate the claim that 1/3 of the bacteria in a pond have eight flagella. Do you agree? Explain. Yet another colleague explains to you that they are going to carry out 100 two-sample t-tests to see if the gene expression levels of some genes are associated with various treatments. They assure you, however, that they will choose a small significance level for each test to account for...
Please use a two tailed test and a= .05 for all tests
One-sample t-test A researcher was interested in examining the effect of exercise on happiness levels among college students. The average college student happiness levels is u = 30. A sample of 5 individuals was selected and asked to exercise for three weeks. And then, they were asked to report their happiness scores. Can he conclude that exercise influences happiness levels ? Happiness 37 32 33 36 32 1)...
PLEASE help ??
A researcher conducted a single sample t-test on results of an experiment with n = 18 participants and the computed t = -2.28. What is the correct conclusion from this experiment if p < 0.05, 2-tails test is used for hypothesis testing? O A. The researcher failed to reject the null hypothesis and concluded that there is a significant treatment effect. O B. The researcher rejected the null hypothesis and concluded that there is a significant treatment...
Dependent samples t-test A researcher wonders whether there is a difference in weight following a vegan diet. The scores for a group of 10 students before (pre) and after (post) the implementation of the vegan diet are recorded: Student Pre () Post () 1 156 146 2 170 145 3 130 125 4 136 114 5 128 110 6 115 110 7 138 116 8 145 130 9 164 150 10 150 120
The difference between the observed value of the dependent variable and the value predicted by using the estimated regression equation is called _______ a. the variance b. a residual c. a prediction interval d. the standard error
8. _____ can be interpreted as the proportion of variance in the dependent variable that is accounted for by the independent variable. MS R2 F d 9. By convention, an R2 value of 0.16 would be considered: too small to reject the null hypothesis. large. small. medium. 10. The Bonferroni test is: more conservative than the Tukey's HSD test. a post-hoc test. a planned comparison test. a post-hoc test and is more conservative than the Tukey's HSD test. 11. Calculation...
A researcher would like to examine how the chemical tryptophan, contained in foods such as turkey, can affect mental alertness. A sample of n = 8 college students is obtained, and each student’s performance on a familiar video game (total points earned in the game) is measured before and after eating a traditional Thanksgiving dinner including roast turkey. The following table are the scores for each participant before and after the meal: Participants: 1,2,3,4,5,6,7,8, Before Meal (X1): 220,245,215,260,300,280,250,310 After Meal...