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The size of the left upper chamber of the heart is one measure of cardiovascular health. When the upper left chamber is enlarged, the risk of heart problems is increased. The paper "Left Atrial Size Increases with Body Mass Index in Children" (International Journal of Cardiology [2009]:1-7) described a study in which the left atrial size was measured for a large number of children age 5 to 15 years. Based on this data, the authors concluded that for healthy children, left atrial diameter was approximately normally distributed with a mean of 26.4 mm and a standard deviation of 4.2 mm.
a. Approximately what proportion of healthy children has left atrial diameters less than 24 mm?
b. Approximately what proportion of healthy children has left atrial diameters greater than 32 mm?
c. Approximately what proportion of healthy children has left atrial diameters between 25 and 30 mm?
d. For healthy children, what is the value for which only about 20% have a larger left atrial diameter?
Calculate the covariance
You have purchased a canning machine for $9,500. You expect the machine to save your company $3,600 each year for the next 10 years.
A red ball and 4 white balls are in a box. If two balls are drawn, without replacement, what is the probability of getting 2 red balls?
to test the claim that there is no difference in the lifetimes in months of two brands of video games a sample of
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High-alumina refractory castables have been extensively investigated in recent years because of their significant advantages over other refractory brick of the same class-lower production and application costs, versatility, and performance at high..
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Identify the fallacies of relevance committed by the following arguments, giving a brief explanation for your answer. If no fallacy is committed, write "no fallacy."
Testing for Population mean - determine if there has been a significant change in the population mean.
A computer chess game and a human chess champion are evenly matched. They play ten games. Find probabilities for the following events.
The press release referenced in the previous exercise also included data from independent surveys of teenage drivers and parents of teenage drivers.
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