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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.
Find out a 95 percent confidence interval for population mean.
If two independent large samples are taken from two populations, the sampling distribution of the difference between the two sample means:
Draw a tree diagram representing this experiment. Use this tree diagram to find the probabilities below.
The quality-control inspector checks 200 pieces in a certain operation. The piece is either good or defective. The record for nine hours.
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
Using part(a), explain to investor differences between distribution of performance figures for the 2 kinds of stock funds.
Find out the probability that: (a) The amount requested is between $65,000 or more?
Mean and standard deviation are 584.6 and 34.28
A consumer organization estimates that over a 1-year period 17 percent of cars will require to be repaired once, 7 percent will need repairs twice, and 4 percent will require three or more repairs. What is the probability that a car chosen at rand..
What is the probability of obtaining 4 ones in a row when rolling a fair, six-sided die? Interpret this probability.
Then use ogive to estimate median and first and third quartiles. Also utilize it to reply following question: What percent of 60 mutual fund loads are less than 75.
A committee of three is selected at random from a set consisting of five Democrats, eight Republicans, and two Independents.
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