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The average age of statistics students nationwide is 22. The standard deviation is 2.5 years. Assume the age is a normally distributed variable.Find the probability that one student selected at random is older than 23.
Dr. Bundy recently earned permission from the warden of a local prison to use prisoners to study the effects of the drug Zoloft on depression.
Suppose we have a ""black box" which on command can generate the value of a gamma random variable with parameters 1.5 and 1. Explain how we can use this black box to approximate
Share with your peers the null and alternative hypotheses for a decision that is relevant to your life. This can be a personal item or something at work.
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
Here are the DMS odor thresholds for 10 untrained students:
Brakes for a model of automobile fail with a Poisson distribution at an annual rate of 4.4/yr. What is the probability that
Calculate the chi-square statistic χ2 to determine if there is enough evidence to conclude that the number of minutes spent online per day is related to gender.
The City Transit Authority plans to hire 8 new bus drivers. From the group of 100 qualified applicants, of whom 55 are men and 45 are women, 8 names are to be selected by lot. Suppose that Mary and John Lewis are among the 100 qualified applicants..
Calculate the sample correlation coefficient by hand. By use of a spreadsheet calculate the sample correlation coefficient.
A study was conducted to determine whether magnets were effective in treating pain. The valves represent pain measurements.
Use the given date to find the minimum sample size required to estimate a population proportion and populat mean. Margin of error: 0.004, confidence level, 90%, sample proportion (p) : = 0.45
The gas price index for 1985 was 218.5 and the gas price index for 2000 was 276.8. If it cost $18.13 to fill your gas tank in 1985, how much would it have cost to fill the same tank in 2000?
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