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Question: Vitamin C Study. In one vitamin C study, subjects were randomly assigned to one of two treatment groups. The treated group received daily pills with vitamin C; the control group received daily placebo pills with no active ingredient. It was found later that the taste of the pills allowed many subjects to break the blind and guess their treatment group. Let X be an indicator of those that correctly guessed their group.
(a) How could this indicator be used as a covariate? Explain the model and what it can answer.
(b) Let V be an indicator of whether subjects believed they were in the treated group. Explain why V might be a better covariate than X.
Does the distribution of the body masses appear to follow a normal distribution? Provide both a graphical and quantitative assessment.
An Internet report on a 1999 Gallup poll (http://www.gallup.com/poll/index.asp, August 2, 1999) included the following statement.
What is the probability X is exactly 5? - What is the probability that X is no more than 10?- What is the probability that X is at least 20?
Find the probability that General Motors will have the largest market share for SUVs in the coming quarter.- Find the probability that Toyota will have the largest market share for SUVs in the coming quarter.
Construct a confidence interval for 95% , the difference between the mean daily calorie consumption of females in September-February and the mean daily calorie consumption of females in March-August. Then complete the table below.
What is the total number of cases in this problem? What percentage of the sample scored 599 and below? What percent of the sample score 400-499?
1. Develop the correlation matrix showing the correlation between all possible pairs of variables. Test statistically to determine which independent variables are significantly correlated with the dependent variable, book sales. Use a significance..
Quarterbacks. Table gives the total passing yards for National Football League starting quarterbacks during the 2007 season.
1. Write a general Metropolis or Metropolis-Hastings algorithm to generate a sample from a target distribution π, where π(x) ∝ x34(1 - x)38(2 + x)125. Use the proposal density as q(x, y) = 1 on the interval [0, 1].
The following are 30-day Euroyen prices on an index from 0 to 100%: 99.24, 99.37, 98.33, 98.91, 98.51, 99.38, 99.71, 99.21, 98.63, 99.10. Find µ, σ, σ2, and the median.
In each case, designate the explanatory variable and the response variable.- Explain whether each of the following experiments was single-blind, double-blind, or neither.
if the invasive tree known as european buckthorn is randomly distributed in a degraded forest at a rate of 5 trees per
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