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What sample size is needed to detect a correlation coefficient as small as 0.50 with a two-tailed test at the 0.05 alpha level with 90% power?
Statistics and Probability, Statistics
The National safety council reported that 52% of American turnpike drivers are men. A sample of 300 cars traveling southbound on the New Jersey Turnpike yesterday revealed that 170 were driven by men. At a 99% level of c ...
Consider a normally distributed set of scores with a mean of 0 and a standard deviation of 5. If a value of 3.25 is sampled from this distribution, what is the corresponding z-score? If necessary, round your answer to tw ...
Consider random samples of size 800 from a population with proportion 0.60. (a) Find the mean and standard error of the distribution of sample proportions. Round your answer for the mean to two decimal places, and your ...
In a health club, research shows that on average, patrons spend an average of 42.5 minutes on the treadmill, with a standard deviation of 4.8 minutes. It is assumed that this is a normally distributed variable. Find the ...
Describe the general concept of economic analysis. Is this type of analysis necessary, and can it really help the individual investor make a decision about stock? Explain
A national air traffic control system handled an average of 47,556 flights during 28 randomly selected days in a recent year. The standard deviation for this sample is 6,251 flights per day. Complete parts a through c be ...
A restaurant serves hot chocolate that has a mean temperature of 175 degrees with a standard deviation of 8.1 degrees. Find the probability that a randomly selected cup of hot chocolate would have a temperature of less t ...
Forty-nine percent of US teens have heard of a fax machine. You randomly select 12 US teens. Find the probability that the number of these selected teens that have heard of a fax machine is exactly six (first answer list ...
Suppose that 1% of the employees of a certain company use illegal drugs. This company performs random drug tests that return positive results 99% of the time if the person is a drug use. However, it also has a 2% false p ...
How is calculating confidence interval different or similar to gambling?
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