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An economist wants to know whether these two variables (the help wanted index and the unemployment rate among insured workers) are related. So he acquired the data for these two variables for each month between 1951 and 2010.The economist determined the covariance to be -2.67. The help wanted index had a standard deviation of 5.54. The unemployment rate among insured workers had a standard deviation of 7.05. Find the coefficient of correlation. Round the answer to two decimal places.
Five horses are running in a race. I bet that Hot Shot will win first place, and Urawinner will win second. What is the probability that I will win?
Outline the difference between the t test for independent groups and the t test for matched groups. A researcher computed the F ratio for a four-group experiment.The computed F is 4.86. The degrees of freedom are 3 for the numerator and 16 for the ..
The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a defective calculator is 10%. What is the probability that 4 or more of the calculators will be defective?
High School GPA is normally distributed with a mean of 3.06 and a standard deviation of 0.40. The probability of a randomly chosen student having a HS GPA between 3.54 and 3.80 is
As a quality engineer working on the Rangdo production line, you have determined that the probability of producing a defective part is 6%.
The city of Oakdale wishes to see if there is a linear relationship between the temperature and the amount of electricity used (in kilowatts). Based on the data in the table below, is there a significant linear relationship between temperature and th..
a medical test for malaria is subject to some error. given a person who has malaria the probability that the test will
Based on a simple random sample of one hundred an analyst estimates the average hourly wage earned by workers in a city to be $30 and computes the margin of error to be $5.
The probability of a player weighing more than 241.25 pounds on a team with the mean weight of 200 pounds and a standard deviation of 25 pounds is ??
If 2 randomly chosen students are surveyed and both feel optimistic about their employment prospects, what is the probability that both were math students?
At a party there are 30 students over age 21 and 20 students under age 21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about attitudes toward alcohol.
If a statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 48.0 and 53.0 minutes what is the probability that a given class period runs greater than 51.25 minutes.
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