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A researcher wants to determine if soundproofing a classroom leads to better behavior among the students. In the standard classrooms, there were 30 behavioral problems from a total of 250 children. In the soundproofed classrooms, there were 20 behavioral problems from a total of 300 children. Test if room noise results in an increased number […]

Three studies were conducted looking at the effects of magnesium sulfate to improve survival of a cardiac arrest. Results from the three studies were as follows: Conduct a meta-analysis to determine the overall effect of magnesium sulfate (MgS04) on survival. Check the Bristow-Day statistic for the homogeneity of the odds ratio, and determine the overall

The relationship between office temperature and head colds is tested for smokers and nonsmokers. Since smoking is assumed to be a confounding factor in this relationship, use a Mantel-Haenszel chi-square for stratified tables to analyze the two tables here:

A randomized clinical trial compared aspirin to placebo for the prevention of heart attacks (MIs) and strokes. Out of a total of 1,000 subjects on aspirin, there were 80 heart attacks and 65 strokes; out of a total of 2,000 subjects on placebo, there were 240 heart attacks and 165 strokes. is there a significant

A survey was conducted where each participant was asked to choose their three favorite classical composers from the following list: The following data was recorded: Run the following program to create the SAS data set CLASSICAL. Using this data set as the starting point, write a SAS program to obtain a single frequency listing showing

A physical exam is given to a group of patients. Each patient is diagnosed as having none, one, two, or three problems from the following code list: The coding scheme is as follows: Using the sample data here: (a) Compute the mean HR, SBP, and DB? (b) Generate frequency counts for each of the nine

What’s wrong with this program?

Using data set CLINICAL from Problem 4.4, create a new SAS data set (CI-IANGE) with one observation per subject with the difference in WEIGHT between the first and last visit. Include in this data set the number of days between the first and last visit. Do not include any patients who have only one visit.

Write a program similar to Problem 4.5, except that we want to include all the data for each patient, excluding any patient who has had only one visit. Instead of having PROC MEANS create printed output, use it to create a SAS data set (PAT_MEAN) containing the mean for each patient (use the AUTO NAME

You want to randomly assign 48 subjects into two groups (Placebo and Drug). Write a DATA step to do this in such a way as to ensure there are exactly 24 subjects in each group. Can you think of how to do this so that in each group of eight subjects, there are exactly four