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The simplest useful numerical description of a distribution consists of measure of center and measure of spread. The p th percentile of a distribution is the value such that p percent of the observations fall at or below it. Example: The Median is the 50th percentile. Q: Why is not the Mean the 50th percentile?
Standard deviation of $1.2 million in 2009. Suppose a sample of 100 major league players was taken. What was the standard error for the sample mean salary?
He stuffs each letter into one of the preaddressed envelopes and seals them. What is the probability that each letter is in the correct envelope?
Over the past few years, banks have strongly promoted online banking and the paying of bills online. In 2003, about 50% of internet users paid bills online.
There is a program for STD/HIV/pregnancy education/prevention called Postponing Sexual Involvement (PSI) run in Atlanta. Evaluation data collected at the end of ninth grade as a follow-up to the program compared two group of adolescents
The statistical analysis predicted that there would be 104 foxes. Calculate the residual for that data point.
Proportional to xi2, that is Var(εi)=σ2 xi2. Suppose that we use the transformation y'=y/x and x'=1/x. Is this a variance-stabilizing transformation?
Medical tests were conducted to learn about drug-resistant tuberculosis. Of 142 cases tested in NJ, 9 were found to be drug-resistant. Of 268 cases tested in Tx, 5 were found to be drug-resistant.
Find out sample size needed to be 95 percent confident that, sample proportion of U.K. annual report graphics which are distorted, is within margin of error of .03 of p.
The probability of obtaining a random sample mean, which is lower than the population mean, is:
The distribution of IQ scores is normal, what proportion of the population would score higher than Bob? Lower than Bob?
Is there a relationship between the opinion and the location of the resident at a level of significance of 0.05?
Identify the scale of measurement in each of the following:
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