Body Data – Savvy Essay Writers | savvyessaywriters.net
Body Data – Savvy Essay Writers | savvyessaywriters.net
Open the Body Data file under “Elementary Statistics, 13th edition†in Statdisk. This file contains information on the measurements of a sample of 300 individuals. The population mean systolic blood pressure is 124.7 with a variance of 211.10. The population standard deviation is said to be roughly 14.5. For this exercise, refer to pages 7, 11, and 12 of the Statdisk User Manual document. Be sure to enter the population standard deviation in the appropriate box.
- Given that the systolic blood pressure is normally distributed, calculate the descriptive statistics for this column of data and paste it here. Your calculations should include:
- Calculate a 90%, 95%, and 99% confidence interval and paste your results here. As the level of confidence increases, what happens to the width of the confidence interval? Does it increase or decrease? Explain why this would happen.
- Since the confidence interval relates to our willingness to calculate a confidence interval that does not include the population mean, what does this tell us about the width of the interval? Give an example of where you might use a 99% confidence interval and another where a 90% interval would be appropriate.
- Based on the data in the “Measurement Data†file, you think that the mean systolic blood pressure is less than the national average of 124.7. Perform a hypothesis test at the 0.05 level of significance to verify this. Use the four-step process outlined in the file “Hypothesis Test for a Population Mean†in the classroom.
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