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A job only hires applicants who score 2 standard deviations or more above the mean on a skills test. If the mean is 77 and the standard deviation is 3, what score must you receive to be hired?
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national exercise rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and find..
What is the probability of randomly selecting a person who is conservative and then selecting from that group someone who is a nursing major?
The Speedy Oil Change Company advertised a 15-minute wait for an oil change. A sample of 23 oil changes showed a mean time of 16.5 minutes and a standard deviation of 4.3 minutes.
let xt 1e t- 0.5et-1 t 123.... where etlld02the variance of et is 2.a compute the mean of xtb compute the variance
Percentage who say "Yes" from 7% to 3.5%? Explain to someone who knows no statistics the advantage of taking a larger sample in a survey of opinion.
The table below contains the opinions of a sample of 200 people (broken down by gender) about the latest congressional plan to fund abortion clinics.
below are the lifetimes in hours of fifty 40-watt 110-volt internally frosted incandescent lamps taken from forced
question a survey by accountemps asked a sample of 200 executives to provide data on the numberof minutes per day
Students in a statistics class at a large state university were given the survey in which one question asked was age (in years); one student was a retired person, and her age was an "outlier".
a population standard deviation is estimated to be 13. we want to estimate the population mean within 1.7 with a
Democrat and Republican, if two voters are randomly selected for a telephone survey, what is the probability that they are both Republicans?
Find a 90% confidence interval for the mean amount left by all groups.
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