Reference no: EM132672087
Assignment: Confidence intervals
You have been given a subset of data from the Vermont 2017 Behavioral Risk Factor Surveillance System (BRFSS). Individuals in Vermont are selected annually for a phone interview, in which they are asked about various demographic, medical, and lifestyle factors. This sample data is then used to draw inferences about the health and welfare of adults in Vermont as a whole. Almost every state administers its own BRFSS survey with some common and some location-specific questions.
1) Download the dataset and save onto your computer: PH303_BRFSS_weight_cvd.sav
2) Start SPSS and open the dataset. What two variables are included in the dataset? Describe in words, not just the variable name.
3) How many subjects are included in the dataset?
Answer the following questions, assuming that the continuous variable is normally distributed.
1) What proportion of the sample subjects has ever been diagnosed with angina or coronary heart disease? Cut and paste frequency table for this variable.
2) Use SPSS to compute the following:
a. The sample size, min, max, mean and 90% confidence interval for weight in pounds among those study subjects who have ever been diagnosed with angina or coronary heart disease.
b. The sample size, min, max, mean and 90% confidence interval for weight in pounds among those study subjects who have never been diagnosed with angina or coronary heart disease.
3) Repeat part 2a and 2b above, using a 99% confidence interval (you don't need to repeat the sample size, min and max).
4) How do the 90% confidence intervals in part 2 compare to the 99% confidence intervals in part 3? In 1-2 sentences explain why they are different.
5) Based on your results in part 2, do you think that there is a true difference in mean weight between those who have ever and those who have never been diagnosed with angina or coronary heart disease, with 90% confidence? Explain your answer in 1-2 sentences.
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