KPerkins-MFT7110-4.2docx

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School

North Central University *

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MISC

Subject

Statistics

Date

Feb 20, 2024

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docx

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Uploaded by MagistrateFog3596

Quantitative Analysis in MFT Northcentral University Assignment 4: Compile z-Scores and BMI Using SPSS 1. Access the SPSS file for this week: SPSS Dataset.BMI.Week 4.sav 2. Calculate, and then report the mean BMI score, the standard deviation, and the range for these data * . a. Mean BMI: 26.3648 b. BMI sd: .51867 c. BMI range: 2.42 3. Sort the states from high to low BMI score. 4. Calculate the z-score for each state’s average BMI (you do so by selecting Analyze  Descriptive Statistics  Descriptives, moving MeanBMI in the Variable(s) box and clicking the box located in the bottom left corner: Save standardized values as variables. Figure 1 . How to calculate descriptives. When you calculate descriptives, you move the variable name from the box on the left to the Variable(s) box located on the right in the Descriptives menu in SPSS. 5. Identify the state and report the z-scores for the states with the (a) highest and (b) lowest BMI. a. Highest: LA , 1.41747 b. Lowest: UT, -3.24832

6. Run Descriptives on the z-scores you obtained. What are the mean and standard deviation for those data? a. z-score mean: .0000000 b. z-score standard deviation 1.00000000 c. Explain why you got the values you did: The standard deviation of 1.000000000 means that the dtat is 1 standard deviation above the mean of .0000000 7. What do you learn from reviewing all the z-scores? I think that I learned that all of the data is evenly and normally distributed. 8. Describe what you learned in this assignment, as well as the issues that remain unclear to you. I am still a little unclear about standard deviations in general. I understand that they show the distribution from the mean (the average score of the data set) but I suppose I’m still unclear about why that information is important for a stud y. I read an article that compared two sets of data with the same mean and yet different standard deviations but it was not clear to me what the significant difference is between the two. Does it have to do with the validity and reliability of a study or sample popul ation? * BMI data retrieved from http://www.insureme.com/insurance/bmi-index-state (data are no longer available at this URL).

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