here are the files
BeforeTherapyAfterTherapyStudyQuiz 11123223 1291630 15131819 762627 10111830 871135 14121721 1392131 10101428 13142232 1082026 891329 12142434 81112 101217 Psychology 2019 (Wi2021) Assignment #3 Due March 7, at 11:59pm, worth 10% of Final Grade For this assignment you are required to use the statistical program R, as demonstrated in Lab. Round all numerical answers to two decimal places, and p values to three. Type all answers in the spaces provided. The data file (Assign3.txt) necessary for this assignment can be found in the Assignments folder. Right click on this file and save it to your computer. This is a text file. It contains four columns of data, two columns for each of the problems below. Create and name your data frame with your first initial followed by the first 4 letters of your last name, all in capitals e.g., if your name is Rick Sanchez your data frame will be called RSANC. Use this data frame to answer the questions below. The assignment is comprised of two parts. Each part requires you to calculate an appropriate t-test with R, as demonstrated in lab. You will answer the following questions, based upon your analysis, and paste your syntax/output into this word document after the last question. Rename and save this Word document as your last name_first name eg. Sanchez_Rick. Upload a copy of this document to Blackboard Assignment #3 Dropbox. (note – ‘pages’ documents will not be accepted) What is your Name? Problem 1 A commonly held belief is that it is always beneficial to one's emotional health to vent one's feelings after a traumatic event. A study attempted to actually test this idea. Researchers tested the Emotional Well Being scores of subjects who had experienced a traumatic event, before and after they received psychotherapy. Perform an appropriate t-test to see if there is a difference in the Emotional Well Being scores before and after the psychotherapy. 1a) What is the Mean for the Before Therapy group? (.5 marks) ________________________ 1b) What is the Standard Deviation for the Before Therapy group? (.5 marks) _____________ 1c) What is the Mean for the After Therapy group? (.5 marks) _________________________ 1d) What is the Standard Deviation for the After Therapy group? (.5 marks) ______________ 1e) What type of t-test is required here? (1 mark) __________________________________ 1f) Report the t-statistic in APA format below (including df, t, and p value). (3 marks) ___________________________________________________________________________ 1g) Is there a significant difference between the means of the groups? State your answer as specifically as possible. (1 mark) ___________________________________________________________________________ ___________________________________________________________________________ 1h) Based upon your answer, can you reject the Null Hypothesis? (1 mark) ___________________________________________________________________________ 1i) Calculate this same t-test by hand. Round to two decimals. You do not have to show your calculations. Just state what you calculated the Standard Error () to be. (1 mark) Standard Error () = ________________________________________________________ Problem 2 Researchers were interested in which of two methods were best for retention. They had all subjects read a chapter in a textbook. Then. one group of subjects ('Study') was encouraged to study the material for 60 minutes. The other group of subjects ('Quiz') were not allowed to study, but were actually given a 60 minute quiz on the material. Then, all subjects were required to complete a final test on the material. Perform an appropriate t-test on the final test scores to see if there is a difference in performance between the Study and Quiz groups 2a) What is the Mean for the Study group? (.5 marks) _________________________________ 2b) What is the Standard Deviation for the Study group? (.5 marks) ______________________ 2c) What is the Mean for the Quiz group? (.5 marks) __________________________________ 2d) What is the Standard Deviation for the Quiz group? (.5 marks) _______________________ 2e) What type of t-test is required here? (1 mark) ____________________________________ 2f) Report the t-statistic in APA format below (including df, t, and p value). (3 marks) _____________________________________________________________________________ 2g) Is there a significant difference between the means of the groups? State your answer as specifically as possible. (1 mark) ___________________________________________________________________________ ___________________________________________________________________________ 2h) Based upon your answer, can you reject the Null Hypothesis? (1 mark) ___________________________________________________________________________ 2i) Calculate the Pooled Variance () for this same t-test by hand. Hint: To save much time, use the Standard Deviations from the R output. Round to two decimals. You do not have to show your calculations. (1 mark) Pooled Variance () =____________________________________________________________ 3) Copy and paste below the syntax you typed into R, and its output, for both tests, as demonstrated in Lab (It will be 1 -2 pages long). Do not include the data. (2 marks) Syntax/output: Psychology 2019 (Wi 202 1) Assignment # 3 D ue March 7 , at 1 1:59pm, worth 10 % of Final Grade For this assignment you are required to use the statistical program R , as demonstrated in Lab . Round all num erical answers to two decimal places , and p values to three . Type all answers in the spaces provided. The data file ( Assign3 . txt ) necessary for this assignment can be found in the Assignments folder. Right click on this fil e and save it to your computer. This is a text file. It contains four columns of data, two columns for each of the problems below. Create and n ame your data frame with your first initial followed by the first 4 letters of your last name , all in capitals e.g., if your name is Rick Sanchez your data frame will be called RSANC . Use th is data frame to answer the questions below . The assignment is comprised of two parts. Each part requires you to calculate an appropriate t - test with R, as demonstrated in lab. You will answer the following q uestions, based upon your analysis, and paste your syntax /output i nto this word document after the last question. Rename and s ave this W ord document as your last name_first name eg. Sanchez_Rick . Upload a copy of this document to Blackboard Assignment # 3 Dropbox . ( note – ‘pages’ documents will not be accepted) What is your Name ? Problem 1 A commonly held belief is that it is always beneficial to one's emotional health to vent one's feelings after a traumatic event. A study attempted to actually test this idea. Researchers tested the Emotional Well Being scores of subjects who had experienced a traumatic event, before and after they received psychotherapy. Perform an appropriate t - tes t to see if there is a difference in the Emotional Well Being scores before and after the psychotherapy. 1a) What is the Mean for the Before T herapy group ? ( .5 mark s ) ________________ _ _______ 1b) What is the Standard Deviation for the Before T herapy group ? ( .5 mark s ) ______ _ ______ Psychology 2019 (Wi2021) Assignment #3 Due March 7, at 11:59pm, worth 10% of Final Grade For this assignment you are required to use the statistical program R, as demonstrated in Lab. Round all numerical answers to two decimal places, and p values to three. Type all answers in the spaces provided. The data file (Assign3.txt) necessary for this assignment can be found in the Assignments folder. Right click on this file and save it to your computer. This is a text file. It contains four columns of data, two columns for each of the problems below. Create and name your data frame with your first initial followed by the first 4 letters of your last name, all in capitals e.g., if your name is Rick Sanchez your data frame will be called RSANC. Use this data frame to answer the questions below. The assignment is comprised of two parts. Each part requires you to calculate an appropriate t-test with R, as demonstrated in lab. You will answer the following questions, based upon your analysis, and paste your syntax/output into this word document after the last question. Rename and save this Word document as your last name_first name eg. Sanchez_Rick. Upload a copy of this document to Blackboard Assignment #3 Dropbox. (note – ‘pages’ documents will not be accepted) What is your Name? Problem 1 A commonly held belief is that it is always beneficial to one's emotional health to vent one's feelings after a traumatic event. A study attempted to actually test this idea. Researchers tested the Emotional Well Being scores of subjects who had experienced a traumatic event, before and after they received psychotherapy. Perform an appropriate t-test to see if there is a difference in the Emotional Well Being scores before and after the psychotherapy. 1a) What is the Mean for the Before Therapy group? (.5 marks) ________________________ 1b) What is the Standard Deviation for the Before Therapy group? (.5 marks) _____________