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A researcher wants to know if the average math SAT scores of high school football players is significantly higher than the average math SAT scores of high school basketball players. She knows that for all basketball players their average math SAT is 442 with a standard deviation of 92. She then selects a sample of 102 football players and finds that their average math SAT is 460. Use alpha =.01 to perform the appropriate hypothesis test.
A psychologist claims that more than 6.3% of the populations suffer from professional due to greate shyness. Categorize the Type II error in this context.
The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages.
Determine the coefficient of correlation between the two variables. Interpret the value.
Use the following data to write the normal equations of the linear regression between Y and X, and find the least squares regression.
How would the General Counsel's decision in Part (b) change if the cost of selling the second suit were only $200,000? What if the cost were $900000?
Find the expected GPA when SAT = 800. Find E (GPA|SAT = 1,400). Comment on the difference.
If wages were increased by $1.00, what is the expected effect on the number of complaints received per employee? How can you tell?
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Find out sample standard deviation (s) of scores Gordon Golfer made on his last four rounds (determine to the nearest one tenth, or .1).
Determine the special property of standard normal distribution, compared to other normal distributions?
What is the probability that all tree students pick a different card?
To test whether there is significant mean difference between two groups using independent sample t test.
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