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Researchers at the Brigham & Women's Hospital recruited 2,000 participants to study the relation between diet and cholesterol. They hypothesized that persons who eat meat will have higher cholesterol compared to vegetarians. Prior to enrollment all 2,000 participants were carnivores. At the time of enrollment, 1,000 participants agreed to switch to a strict vegetarian diet. After several months the researchers measured the cholesterol levels of the 1,000 carnivores (the exposed group) and the 1,000 vegetarians (the unexposed group) and categorized each participant as having low or high cholesterol
Researchers collected the following data:
A. What type of study design is this?
B. Complete the 2x2 table below. Be sure to label the rows and columns.
Name three elements of the inferential statistical analysis.
If two independent large samples are taken from two populations, the sampling distribution of the difference between the two sample means:
Either summarize your design or give an appropriate layout with table.
The level of significance indicates the probability of rejecting a false null hypothesis.
The number of standard errors that the sample estimate (p 1 - p 2 ) of (p1 - p2) falls from its null hypothesis value of zero is called
The following frequency distribution was obtained. The data values are in hours. Construct a histogram for the data .
Suppose that n trials of a binomial experiment result in no successes.
Consider the following time plot of the values of variable Y for each month of a 60-month period. This plot displays
Suppose the population standard deviations are not the same. At.05 significance level, is there a difference in mean waiting time?
Let be the average of the pay you receive for the first and second week. Find the sampling distribution
Form a frequency distribution and a percentage distribution that have class intervals with the upper class limits $99, $119, and so on.
Compute the probability of exactly 0,1,2,3,4, and 5 arrivals per day.
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