Which test is used when looking at comparison of means from a single dependent variable among...

Which test is used when looking at comparison of means from a single dependent variable among two or more groups or samples?

Expert Solution

Case 1 - Two Groups

If the means of a single dependent variable among groups follows normal distribution
- we do not know the population variances of two groups and assumed that the variances of two groups are not equal - Independent Samples t test
- we do not know the population variances of two groups and assumed that the variances of two groups are equal - Pooled t test
- we know the population variances of two groups Independent Samples z test
If the means of a single dependent variable among groups do not follow normal distribution - Mann-Whitney test

Case 2 - More than Two Groups

If the means of a single dependent variable among groups follows normal distribution and variances of dependent variable are equal within groups - One Way Anova
If the means of a single dependent variable among groups do not follow normal distribution - Kruskal Wallis test

milcah answered 1 year ago

I'm interested in a t-test of looking at the means for the <30 group in comparison...

I'm interested in a t-test of looking at the means for the <30 group in comparison to the other age groups. Do I need to run four t tests, one for <30 with each age group? The data below details the percentage of giving by age group for each of the 32 years listed. Thank you! Year <30 30-44 45-59 60-74 75+ 1978 0.069 0.226 0.370 0.252 0.083 1979 0.068 0.229 0.358 0.257 0.088 1980 0.068 0.233 0.348 0.259 0.092...

What is the difference between a test of independent means and a test of dependent means,...

What is the difference between a test of independent means and a test of dependent means, and when is each appropriate?

Describe two statistical tests which could be used for group comparison; and when each test would...

Describe two statistical tests which could be used for group comparison; and when each test would be appropriate

A t-test is used to compare the means of one variable for two groups of cases....

A t-test is used to compare the means of one variable for two groups of cases. As an example, a practical application would be to find out the effect of a new drug on blood pressure. Patients with high blood pressure are randomly assigned into two groups, a placebo group and a treatment group. The placebo group would receive conventional treatment while the treatment group would receive a new drug that is expected to lower blood pressure. After treatment for...

identifying what statistical test is used? independent and dependent variable? complete analysis in JASP. Answer the...

identifying what statistical test is used? independent and dependent variable? complete analysis in JASP. Answer the research question, write APA statement and Descriptive statistics. A study by an American university examined whether scores on the SAT accurately predict students’ GPA score three semesters into their first year. A random sample of 11 students agreed to release their information for the purpose of the study. gpa sat 3.32 600 2.26 640 2.35 530 2.08 600 3.38 580 3.29 630 3.21 400 2...

what is the independent variable. what is the dependent variable, and what hypothesis test is it.

what is the independent variable. what is the dependent variable, and what hypothesis test is it.Imagine that you are interested to see if there is a relationship between gender, people's religion and what they consider the ideal family size to be. You would likely do this by recruiting individuals from different religious groups and asking them to report what they consider the ideal amount of children in a family. Let us further say that you ended up recruiting (via random...

Which variable should be the dependent variable and which should be the independent variable? Why? Plot...

Which variable should be the dependent variable and which should be the independent variable? Why? Plot the points on the scatterplot graph. NOTE: In a scatterplot the x axis will always reflect 1, 2, 3… not the Quarters specifically. Label both axes with words. In order to analyze the data we will use the line of best fit. Answer with 1-3 complete sentences. Does the line seem to fit the data? Why? Calculate the following use excel trendline: y-intercept to...

There are three (3) cases for handling the comparison of means using the Student’s t-test. For...

There are three (3) cases for handling the comparison of means using the Student’s t-test. For each of the scenarios listed below, identify which case (i.e. Case #1, #2, or #3) you would use in order to determine if the results agree “within experimental error”: Provide a brief explanation to receive full credit! A FDA scientist is testing a sample of ground beef, suspected of being contaminated with E-Coli, using one of their standard methods. The average of several replicated...

Define and defend all variables, including the dependent variable, in a single paragraph for each variable....

Define and defend all variables, including the dependent variable, in a single paragraph for each variable. Also, state the expectations for each independent variable. These paragraphs should be in numerical order, i.e., dependent variable, X1, then X2, etc. Dependent Variable: Players Annual Pay Independent Variables: Batting average, Stolen bases, Home Runs, and RBIs. In each paragraph, the following should be addressed: How is the variable defined in the data source? Which unit of measurement is used? For the independent variables:...

At α = .05, test to determine if the means of the three populations (from which...

At α = .05, test to determine if the means of the three populations (from which the following samples are selected) are equal. Sample 1 Sample 2 Sample 3 60 84 58 78 80 57 72 79 67 66 81 66 a) Calculate the MSTR b) Calculate the MSE c) Calculate the F-statistic d) Determine the p-value of the F-statistic e) Using a 0.05 level of significance, what would you advise the dietician about the effectiveness of the three diets?

Question