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For each of the studies described, explain whether the study was an observational study or a randomized experiment.
a. A group of 100 students was randomly divided, with 50 assigned to receive vitamin C and the remaining 50 to receive a placebo, to determine whether or not vitamin C helps to prevent colds.
b. A random sample of patients who received a hip transplant operation at Stanford University Hospital during 2000 to 2010 will be followed for 10 years after their operation to determine the success (or failure) of the transplant.
c. Volunteers with high blood pressure were randomly divided into two groups. One group was taught to practice meditation and the other group was given a low-fat diet. After 8 weeks, reduction in blood pressure was compared for the two groups.
If the company wanted to combine the sales data from both companies, how should the new corporate database set up this relationship (take your best guess, one-to-one, or one-to-many)? Why?
Most compilers can produce a source listing of the program being compiled. This listing is usually just a copy of the source file, perhaps embellished with line numbers and page breaks. Assume you are to produce a pretty printed listing.
A silver dollar is flipped twice, calculate the probability of each of the following occurring
Based on past information, for the cars used, the distance traveled by a car in a day averages 170 km with a standard deviation of 40 km. What proportion of cars used in any day travel less than 100 km?
Develop an appropriate forecast model for the given problem whereas the student population has remained constant during this period.
question how would you explain the analysis of variance assuming that your audience has not had a statistics class
the number of times a batter gets to bat in a game follows a binomial distribution nbin6 0.8. given the number of times
At the 0.05 level of significance, is there evidence of a difference in the daily customer count based on the price of a small coffee?
Elucidate the null and alternative hypothesis for the difference among the two means. In testing the difference between the means of two.
A two-way ANOVA compares two exercise programs (A and B) and two exercise frequencies (twice a week and four times a week). The response variable is weight lost after 8 weeks of exercise. An interaction is present in the data when
Describe and analyze your quantitative data and Briefly address the data analysis process.
Set up probability distribution by illustrating all x values and their associated probabilities. List sample space of tossing a fair coin.
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