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In a large lecture class, the professor announced that the scores on a recent exam were normally distributed with a range from 51 to 87. Using the Empirical Rule ? ± 3? to estimate ?, how many students would you need to sample to estimate the true mean score for the class with 90 percent confidence and an error of ± 2?
1assume your federal income tax rate fitr is 28 and state income tax rate sjtr. is 8. calculate your after-tax cash
An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed. If a sample of 16 bulbs has an average life of 50 hours and the population standard deviation is known to be 10 hours.
You have an observed mean of 55, an observed standard deviation of 12. Which Z value is associated with each raw score below?
The Appliance Center has six sales representatives at their North Jacksonville outlet. Listed below is the number of refrigerators sold by each last month.
State the hypotheses that will help us determine whether a change occurred in the mean length of a work week. At a = .05 can the null hypothesis be rejected? What is your conclusion?
Write a statistical laboratory report using the guidelines in the assigned article, "How to Write a Statistical Report."
An engineer in an automotive factory wishes to know what the tire pressure is on all cars leaving the factory. She measures the tire pressure on a sample of 10 randomly selected cars as they are about to leave the plant, in psi.
Find the value of k. Find the cdf of X. Find the mean and the variance of X.
Test the mean cholesterol content in the egg is greater than 2.5 percent
hamilton county judgesread the hamilton county judges case study and please provide a managerial report that includes
solve the following standard normal probabilities to five decimalsa. pz gt 0.68b. pz gt -1.56c. pzd. p-1.22e. p2.78 gt
Do these data lend support to this belief? Perform a significance test to answer this question. Construct and interpret a 95% confidence interval for the difference in proportions.
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