Question

In: Statistics and Probability

Now please fill your homework to a blank A4 paper. Do not forget to write 1-...

Now please fill your homework to a blank A4 paper. Do not forget to write
1- What is a correlation in statistics?
2- What is the purpose of correlation?
3- What are differences between Spearman and Pearson correlation?
4- Why pearson and Spearmen correlation can differ?
5- What do you mean by rank correlation?
6a- What are the assumptions of pearson’s correlation coefficient itself?
6b- What are the assumptions of statistical significance-test for correlations?
(see the file PSY214-03.ppt)
7- What is homoscedasticity assumption? Please explain with a simple drawing.
8- Please check correlations between (I_V and D_V1, I_V and D_V2, D_V1 and D_V2) and report in APA style.
9- With your results (by cleaning outliers and not cleaning) explain the effect of outliers on Pearson, Spearman and Kendal's coefficients.
10-Please write SPSS commands and option selections for correlation analysis.
If you have problem with data cleaning please use the data sets in drive noted “outliers cleaned”

Solutions

Expert Solution

1. Correlation in statistics is an assessment that measures the quantity of the direction and the strength, of two variables that we analyze, to fluctuate together.

2. The purpose of correlation is to find a relationship between two variables so that one can predict how they will behave in the future. Correlation coefficient helps in putting a value to the relationship between two variables. This prediction is very important in the fields like health care, government sector and also in business. In business it helps in forming business plans and budgets.

3. Pearson's correlation coefficient is used when the variables under consideration are linearly related ( that is they move together at a constant rate and we can graphically represent them as a straight line) whereas spearman correlation coefficient can be used with ordinal, interval or ratio variables. Pearson's correlation coefficient depends on the values of the variables but superman's is based on tha rank that we assign to each variable. Pearson's do not work well when there are outliers in the data but Spearman can be used in this case as well.

4. Pearson's coefficient and Spearman's coefficient, both measures the relationship between the variables. But they are not the same. Pearson's measures the linear relationship between the variables and finds how well a straight line can describe the relationship whereas spearman's measures the rank order of two variables and it does not worry about where exactly these points are.


Related Solutions

Please do not forget to write down all the names of your group members. 1. Please...
Please do not forget to write down all the names of your group members. 1. Please propose the mechanism for α−β C-C bond cleavage of G6P. Draw the mechanism clearly, give the structures of the product, and then explain why steps 2 and 3 of glycolysis are necessary. 2. If glucose is labeled at C1 carbon (the C1 carbon is tagged with radioactive 14C), where would this labeled C atom be (which carbon atom number, draw the structure and label...
Write a 3 pages paper about euthonesia and don’t forget to cite your sources. Do not...
Write a 3 pages paper about euthonesia and don’t forget to cite your sources. Do not forget the reference page.
FILL IN THE BLANK: (The size of the blank has nothing to do with the answer)...
FILL IN THE BLANK: (The size of the blank has nothing to do with the answer) 1. The _____ propensity to consume is the change in _____ from a one unit increase in aggregate income or output 2. When a country has a stabilization________ it will use Keynesian fiscal stimulus whenever real GDP was expected to fall short of the full ___________ output level. 3. The _________ out effect occurs when government borrowing leads to higher _________ rates and lower...
Do not forget your LABELS or your AXES. And please, do NOT put in numbers until...
Do not forget your LABELS or your AXES. And please, do NOT put in numbers until the LAST STEP. Solve SYMBOLICALLY. Assign SYMBOLS to each of your variables, and write your equations USING ONLY THE SYMBOLS. 1. Block A (2.5 kg) and block B (1.3 kg) are held together with a compressed spring (of negligible mass) between them. When they are released, the spring pushes them apart, and they then move off in opposite directions, free of the spring. The...
QUESTION 1 This goes for ALL fill in the blank questions- Do not use Commas or...
QUESTION 1 This goes for ALL fill in the blank questions- Do not use Commas or Periods in your answers, just the letter. If not, your answer will be marked wrong. The following events took place in June 2016. Senior Frogg’s prepares monthly financial statements. Senior Frogg’s. is in the business of making Mexican Food. Match each event with the choice that correctly describes the effect of the transaction on the accounting equation: Increase (+), Decrease (-), No effect (NE)....
Please fill in the blank tables below, given the following information. Experiment 1: Measure the pH...
Please fill in the blank tables below, given the following information. Experiment 1: Measure the pH of Acids Take seven small, clean test tubes from the Containers shelf and place them on the workbench. Double-click on the test tubes and label them with numbers 1 – 7. Take 0.1 M hydrochloric acid from the Materials shelf and add 5 mL to test tube 1. Take water from the Materials shelf and add 5 mL to test tube 1. Take water...
Please fill in the blank. A class of molecules called _____________________________ are molecules composed of proteins...
Please fill in the blank. A class of molecules called _____________________________ are molecules composed of proteins bound to glycosaminoglycans. These molecules are an important component of the extracellular matrix of animals
Please Fill in the blank: The mitotic spindle consists of ___________. These arise from two _____________,...
Please Fill in the blank: The mitotic spindle consists of ___________. These arise from two _____________, located at a _______________. The mitotic spindle moves ______________ around the cell by attaching to their ________________.
Please provide a quality and complete solution. If you do, then don't forget to mention your...
Please provide a quality and complete solution. If you do, then don't forget to mention your email in the comments. I will send a nice tip through paypal. Thanks :) COMPARE AND CONTRAST EMR! Project = Web Research: Find at least two different Electronic Medical Records providers or Personal Data Records providers. Provide some details and compare and contrast the systems. 3 pg min, 5 pg max. Preferable one public or free system vs. paid provider. Some public choices are...
Fill in the blank with the appropriate medical term. Please “BOLD” the terms that you insert....
Fill in the blank with the appropriate medical term. Please “BOLD” the terms that you insert. Mary just had a baby; therefore, she is in the 6-week period after birth, better known as _________. Since this was Mary’s first viable child, she was termed_________. Before the birth, or during the ________ portion, she was worried that her baby would be born dead, or ______________. She was also worried she may develop metabolic disturbances such as eclampsia, which is known as...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT