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You are interested in the relation between the number of years working for a particular company and job satisfaction. You survey 40 workers at this company and obtain a correlation coefficient of .30 between these two variables. What is the effect size of this correlation?
Compute the regression equation based on these sample data if you wish to predict the university GPA using the student SAT score.
The retailer's managers would like to know if they can evaluate this sampling plan using a binomial distribution with n = 50 and p = 0.02.
A random sample of 100 people reveals that the sample average is 3.2 and the sample standard deviation is 2.1. Construct a 95% confidence interval for the population average.
A researcher asks the question "Is there a relationship between LSAT total scores and GPAs in the master's programs in nuclear physics?"
Assuming the population standard deviation of the amount spent per owner is $12, construct and interpret a 95% confidence interval for the mean amount spent per owner for an obedience class.
Explain to someone who knows no statistics what the announced result 87.5% ± 1% means. What is the standard error of the estimated percent
430 randomly selected light bulbs were tested in a laboratory, 224 lasted more than 500 hours. Find a point estimate of the proportion of all light bulbs that last more than 500 hours.
Suppose the probability that Bill can solve a problem is p1 and the probability that Mike can solve it is p2. Show that the probability that Bill and Mike.
an amusement park studied methods for decreasing the waiting time minutes for rides by loading and unloading riders
We might raise two issues with this test. First, does the data come from a random sample from some population? Second, what is the relevant population?
Five have a 3/10,000 chance for failure. Four have a 4/10,000 chance for failure. One componet has a 1/100 chance for failur. What is the overall reliability of the product?
What happens to the Maximum Error of Estimate as the sample size gets larger?
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