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What test can be used to assess whether mean serum retinol has increased over 3 years among subjects in the vitamin A group. See table 10.33
One interesting aspect of the study described in problem 10.64 is to assess changes in other parameters as a result of supplementation with vitamin A. One quantity of interest is the level of serum triglycerides. Researchers found that among 133 participants in the vitamin A group (males and females combined) who were in the normal range at baseline (<2.13 umol/L) 15 were above the upper limit of normal at each of their last 2 consecutive study visits. Similarly, among 138 participants in the trace group who were in the normal range at baseline (<2.13 umol/L), 2 were above the upper limit of normal at each of their last two consecutive study visits.
What test can be performed to compare the percentage of participants who developed abnormal triglyceride levels between the vitamin A group and the trace group? Implement the test in Problem 10.68, and report a two tailed p value.
Find the test statistic value for testing the equality of population means of the two samples.
What is the 25th percentile of a chi squared distribution with 20 degrees of freedom? What symbol is used to denote this value?
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If W denotes the total number of spaces one moves under these special conditions, find the mean and standard deviation of W.
Use this information to construct a probability table, and then calculate each of the following probabilities:
What is the probability that a cereal would be high calorie, given that is low fiber? In other words, what is P (high calorie, given low fiber)?
Does drug have significant effect on aggression? Use an alpha level of .05, two tails.
A stockbroker at Critical Securities reported that the mean rate of return on a sample of 10 oil stocks was 12.6 percent with a standard deviation of 3.9 percent. The mean rate of return on a sample of 8 utility stocks was 10.9 percent with a stan..
At a college, 70 percent of the students are women and 35 percent of students receive grade of C. About 20 percent of students are neither female nor C students. Use this contingency table.
Interpret the meaning of the slopes of the given multiple regression equation
Illustrate that probability distribution of X satisfies properties of a discrete probability distribution.
Choose any medical scientific study who applied a Bayer Theorem and write down the article information (title, author, location, and date) of the article
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