What is the difference between a One sample t-test, Unpooled t-test, Pooled t-test, Paired t-test...
What is the difference between a One sample t-test, Unpooled t-test, Pooled t-test, Paired t-test, and Mann Whitney U test? How do you know when to use each test?
Homework Answers
One sample t test is used to test significance of difference between a sample mean and a hypothesized value of the mean of the population.
Unpooled t test is used to test the significance of the difference between two population means from independent samples, if the sample variances are significantly different.
Pooled t test is used to test the significance of the difference between two population means from independent samples, if the sample variances are not significantly different.
Paired t test (also called dependent sample t test) is used to determine whether the mean difference between two sets of observations, where each subject is measured twice, resulting in pairs of observations.
Mann Whitney U test is used to compare the differences between two independent groups when the dependent variable is either ordinal or continuous but not normally distributed.
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What is the difference between a One sample t-test, Unpooled t-test, Pooled t-test, Paired t-test...
when variances between two samples are not equal in a paired sample t test, the pooled...
when variances between two samples are not equal in a paired sample t test, the pooled variance must be computed and used 8n place of the estimated standard error. t or f
) A sample of 15 graduating students, 15 females and 5 males, was randomly selected. Their GPAs were recorded, and the ranks of these GPAs for the pooled sample are presented below. Test the following...
) A sample of 15 graduating students, 15 females and 5 males, was randomly selected. Their GPAs were recorded, and the ranks of these GPAs for the pooled sample are presented below. Test the following hypothesis: H0: There is no difference in GPAs between the genders? Use the Mann-Whitney test. Males Females 11 1 12 2 3 13 14 4 6 5 15 7 8 9 10 Calculated test statistic: Critical value of the test statistic: Decision rule: Decision:
only need 2-sample t-test for equal variance filled out 1. Create a table using the provided...
only need 2-sample t-test for equal variance filled
out
1. Create a table using the provided headings for the following tests. The comparison is what is being statistical tested. The other assumptions column should be any additional information needed to distinguish when that test is used as compared to the other tests in the table. (5 pts) Tests to include: 2-sample t-test for equal variance, 2-sample t-test for unequal variance, Mann-Whitney U-test, Z-test, Paired t-test, Wilcoxon Signed Rank Test, 1-Sample...
Design your own study using one of the following statistical tests: one-sample t-test, paired samples t-test, independen...
Design your own study using one of the following statistical tests: one-sample t-test, paired samples t-test, independent samples t-test, or ANOVA. Give (1) your sample, (2) research question, (3) the appropriate test with the null and research hypotheses, and (4) the two variables, including (a) how you would measure both variables and (b) each variable’s level of measurement. Be creative. Do not include data in your response.
11. What statistical test would be appropriate to use when assessing the relationship between dif...
11. What statistical test would be appropriate to use when assessing the relationship between different cultures (i.e., Italian, Indian, German, American, and Mexican) and the spice levels in their food? Mann-Whitney U T-test ANOVA (Analysis of Variance) Chi-square test of independence a. b. c. d. 12. Confounding is said to be present in a study where the crude measurement of odds ratio is 2.0, and the adjusted measure is 1.85. a. True b. False c. Insufficient information
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Which Test those cases should use? A: one sample z-test B: one-sample t-test C: t-test for the...
Which Test those cases should use? A: one sample z-test B: one-sample t-test C: t-test for the difference between means for two related samples D: t-test for the difference between means for two independent samples with homogeneity of variance E: t-test for the difference between means for two independent samples with heterogeneity of variance F: a one sample z-test for proportions (or a chi-square goodness of fit) G: chi-square goodness of fit only (where a one sample z-test of proportions isn’t appropriate) H: a two-sample z-test...
1. What does the paired-samples t-test test for? 2. The paired-samples t-test utilizes a within-subjects design....
1. What does the paired-samples t-test test for? 2. The paired-samples t-test utilizes a within-subjects design. What is the main difference between a within-subjects design and a between subjects design? 3. What is the difference between a repeated measures and a matched design?
Imagine that a researcher is conducting a paired-samples t test. She finds that the sample mean...
Imagine that a researcher is conducting a paired-samples t test. She finds that the sample mean difference is 5, the standard deviation of the difference scores is 15, and the sample size is 85. The researcher is also using a typical null hypothesis that proposes no differences between the relevant population means. Under these circumstances, what is the value of the paired-samples t statistic? Please retain a minimum of three decimal places for all steps (if relevant) and provide a...
When using the pooled variance t-test, if the sample size for the first group is 16...
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A drop down options: two sided or one sided // paired t test, one sample t...
A drop down options: two sided or one sided
// paired t test, one sample t test , or test or 2 independent
means
B drop down options: a difference exists or no difference exists
// a difference exists or no difference exists
A supermarket has noticed a recent increase in the number of people venting their frustrations on social media about excessive waiting times during check-out. Even though they hire additional staff during peak shopping hours, they're not sure...
only need 2-sample t-test for equal variance filled
out
1. Create a table using the provided headings for the following tests. The comparison is what is being statistical tested. The other assumptions column should be any additional information needed to distinguish when that test is used as compared to the other tests in the table. (5 pts) Tests to include: 2-sample t-test for equal variance, 2-sample t-test for unequal variance, Mann-Whitney U-test, Z-test, Paired t-test, Wilcoxon Signed Rank Test, 1-Sample...
11. What statistical test would be appropriate to use when assessing the relationship between different cultures (i.e., Italian, Indian, German, American, and Mexican) and the spice levels in their food? Mann-Whitney U T-test ANOVA (Analysis of Variance) Chi-square test of independence a. b. c. d. 12. Confounding is said to be present in a study where the crude measurement of odds ratio is 2.0, and the adjusted measure is 1.85. a. True b. False c. Insufficient information
11. What statistical...
A drop down options: two sided or one sided
// paired t test, one sample t test , or test or 2 independent
means
B drop down options: a difference exists or no difference exists
// a difference exists or no difference exists
A supermarket has noticed a recent increase in the number of people venting their frustrations on social media about excessive waiting times during check-out. Even though they hire additional staff during peak shopping hours, they're not sure...
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