I need help with these questions on Week 6 Correlations exercise.
I need help with these questions on Week 6 Correlations exercise.
PART 1
1. What is the strongest
correlation in the matrix? (Provide correlation value and names of variables)
2. What is the weakest correlation in the matrix? (Provide correlation value and names of variables)
3. How many original correlations are present on the matrix?
6. Which variable is most strongly correlated with body mass index? What is the correlational coefficient? What is the sample size for this relationship?
7. What is the mean and standard deviation for BMI and doctor visits
On PART II
1. What is the mean and standard deviation for weight and bmi
Note: The SPSS output information attachment is the statistical data that has already been run to answer the questions. Just not sure what to pull from to answer these questions? Help!
Week 6 Correlations ExercisesCorrelations are used to describe the strength and direction of a relationship betweentwo variables. A correlation between two variables is known as a bivariate correlation. Inthis module, the Pearson Product-Moment Correlation will be used when running acorrelation matrix. The Pearson correlation coefficient ranges from a value of –1.0 to1.0. A correlation coefficient is never above 1.0 or below –1.0. A perfect positivecorrelation is 1.0, and a perfect negative correlation is –1.0. The size of the coefficientdetermines the strength of the relationship and the sign (i.e., + or –) determines thedirection of the relationship. The closer the value is to zero, the weaker the relationship,and the closer the value is to 1.0 or –1.0, the stronger the relationship. A correlationcoefficient of zero indicates no relationship between the variables.A scatterplot is used to depict the relationship between two variables. The generalshape of the collection of points indicates whether the correlation is positive or negative.A positive relationship will have the data points group into a cluster from the lower left-hand corner to the upper right-hand corner of the graph. A negative relationship will bedepicted by points clustering in the lower right-hand corner to the upper left-hand cornerof the graph. When the two variables are not related, the points on the scatterplot will bescattered in a random fashion.Part IUsing Polit2SetB data set, create a correlation matrix using the following variables:Number of visits to the doctor in the past 12 months (docvisit), body mass index (bmi),Physical Health component subscale (sf12phys), and Mental Health componentsubscale (sf12ment). Run means and descriptives for each variable, as well as thecorrelation matrix.Follow these steps using SPSS:1. Click onAnalyze, thencorrelate, thenbivariate.2. Select each variable and move them into the box labeled “Variables.”3. Be sure the “Pearson and two-tailed” box is checked.4. Click on theOptionstab (upper-right corner) and check “means and standarddeviations.” The “Exclude cases pairwise” box should also be checked. Click onContinue.5. Click onOK.To run descriptives fordocvisit,bmi,sf12phys, andsf12ment, do the following in SPSS:1. Click onAnalyze,then click onDescriptives Statistics, thenDescriptives.
2. Click on the first continuous variable you wish to obtain descriptives for (docvisit)and then click on the arrow button and move it into the Variables box. Then clickonbmi,and then click on the arrow button and move it into the Variables box.Then click onsf12phys,and then click on the arrow button and move it into theVariables box. Then click onsf12ment,and then click on the arrow button andmove it into the Variables box.3. Click on theOptionsbutton in the upper right corner. Click onmean andstandard deviation.4. Click onContinueand then click onOK.Assignment:Answer the following questions about the correlation matrix.1. What is the strongest correlation in the matrix? (Provide correlation value andnames of variables)2. What is the weakest correlation in the matrix? (Provide correlation value andnames of variables)3. How many original correlations are present on the matrix?4. What does the entry of 1.00 indicate on the diagonal of the matrix?5. Indicate the strength and direction of the relationship between body mass indexand physical health component subscale.6. Which variable is most strongly correlated with body mass index? What is thecorrelational coefficient? What is the sample size for this relationship?7. What is the mean and standard deviation for BMI and doctor visits?Part IIUsing Polit2SetB data set, create a scatterplot using the following variables: x-axis =body mass index (bmi) and the y-axis = weight-pounds (weight).Follow these steps in SPSS:1. Click onGraphs, then click onLegacy Dialogs, then click onScatter/Dot.2. Click onSimple Scatterand then click onDefine.3. Click onweight-poundsand move it to the y-axis box and then click onbodymass indexand move it to the x-axis box.4. Click onOK.To run descriptives forbmiandweight, do the following in SPSS:5. Click onAnalyze,then click onDescriptives Statistics, thenDescriptives.6. Click on the first continuous variable you wish to obtain descriptives for (bodymass index), and then click on the arrow button and move it into the Variables
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