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Question: Remember that a confounding variable affects the response variable and is related to the explanatory variable. For each of the following situations, explain how the given confounding variable meets these criteria.
a. Response variable = Child's IQ at age 10; explanatory variable = whether mother smokes or not; confounding variable = mother's educational level.
b. Response variable = Number of missing or decayed teeth a child has; explanatory variable = amount of past exposure to lead; confounding variable = number of visits to a dentist the child has made in the past 3 years.
a) Set up the null and alternative hypotheses, and perform the hypothesis test. b) Based on these results, does the diet appear to be effective? Does the diet appear to have practical significance?
a medical device manufacturer claims to have developed a thin aicd that contains a mean of no less than 41 joules of
1. An observational study is conducted to investigate the association between age and total serum cholesterol. The correlation is estimated at r = 0.35. The study involves n=125 participants and the mean (std dev) age is 44.3 (10.0) years w..
in 2008 a university in the midwestern united states surveyed its full-time first-year students after they completed
In what way are the quota sample and the stratified sample similar? In what way are they different? What effect does this difference have on the applications for which such samples might be appropriate?
suppose you were given the task of estimating the proportion of drivers in troy al who text while they drive. discuss
Find the marginal probabilities, are Disney and Amazon stock returns independent and what is the mean and variance of the stocks D and A?
For this plot, the sample variance is s2= 0.081 . Test the claim using a = 0.1 that the population variance of annual wheat production for the first plot.
In opera, soloists sing both recitatives and arias. What is a recitative? What is an aria? How do recitatives and arias differ? What is their purpose in opera?
Two cards are picked in succession (without replacement) from a standard deck. If o is an outcome, let X(o) equal the sum of the numbers on the cards.
Determine how self confident a person may be. Analysis and Justification. Prepare an analysis of how you developed your instrument.
what is a 99 confidence interval on our estimate of mean if our sample of 40 observations with a sample standard
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