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Statistics often is concerned with estimating the center of a distribution by using the mean, median, and sometimes the mode. Describe a real-world example in which one measure of central tendency provides useful information while another measure of central tendency provides meaningless (or even misleading) information. Also explain which of the three measures of central tendency would be appropriate, for this example, and why. Identify what you think is the best measure of variability to use for your example and explain why you believe it to be better than the others.
Find the degrees of freedom for unequal variance test. (Round down your answer to the nearest whole number.) State the decision rule for .05 significance level. (Round your answer to 3 decimal places.)
Does Lavastatin reduce the risk of heart attack? In a Texas Study, researchers gave Lovastatin to 2,325 people, and a inactive substitute to 2,081 people, with an average age of 58. After 5 years, 57 of the lovastatin group suffered a heart attack..
The researcher found that Abraham Lincoln's educational score did not correlate highly with the expected variable. What is wrong?
If 300 stolen cars are randomly selected, what is the mean and standard deviation of the number of cars recovered after being stolen?
Determine how large a sample would be necessary to estimate the population proportion with a margin of error of .05 at 95% confidence
What is a 90% confidence interval for the mean monthly expenditure on gasoline per household in Slippery Rock?
Determine the values of mean M and standard deviation s for original sample?
On average, 40 percent of U.S. beer drinkers order light beer. (a) What is the probability that none of the next eight customers who order beer will order light beer?
Mmen will have a heart attack in the next 5 years. How large a sample would we need to have an 80% chance of finding a significant difference if the true rate of heart disease in this group is 13%?
Find the percentage of the total variation that cant explained by the linear relationship between the two variable.
The management of White companies considering a new method of assembling its golf cart. Compute which assembly time using the new method is faster.
Use mathematical induction to prove that : 1*2+2*3+3*4+....+n(n+1)(n+2)/3 for all n >_1 and (2) Find d=gcd (721 , 448), find integers s and t with d=721s + 448t, and put the fraction 448/721 in lowest terms.
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