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An article titled "Teen Boys Forget Whatever It Was" appeared in the Australian newspaper The Mercury (April 21, 1997). It described a study of academic performance and attention span and reported that the mean time to distraction for teenage boys working on an independent task was 4 minutes. Although the sample size was not given in the article, suppose that this mean was based on a random sample of 50 teenage Australian boys and that the sample standard deviation was 1.4 minutes. Is there convincing evidence that the average attention span for teenage boys is less than 5 minutes?
Can we conclude that there is a difference in the output of the machines? Use a level of significance of 0.10.- Find a 95% confidence interval for difference in the proportion of nonconforming parts between the two machines.
a researcher with ministry of transportation is commissioned to study the drive times to work one-way for u.s. cities.
Make a decision regarding the null hypothesis. Is there a significant difference in the class ranks of men and women?
Formulate West's production-mix decision as a linear programming problem, and solve. NOTE: This problem must be solved using one of the following methods. How many tables and bookcases should be produced each week?
Is there any evidence to suggest the population variance in malic acid is greater than 0.36? Assume the underlying distribution is normal and use a = 0.05.
Few years ago, the average number of hours worked each week by general practitioners was known to be 49. A random sample of 29 general practitioners this year gives a mean of 52 hours per week, with a standard deviation of 4.3 hours. To test if ..
Determine the optimum mix of products in terms of maximizing contributions to profits for the next period. Show all work.
suppose that you add 10 to all of the observations in a sample. how does this change the sample mean? how does it
a multiple choice question consist of 8 questions with five choices abcd or e.if all 8 answers are random guesses what
assume that the data has a normal distribution and the number of observations is greater than 50. find the critical z
Ball bearings are manufactured with a diameter of 5 mm. But the process has variation, so the diameter is normally distributed with a mean of 5 mm and a standard deviation of .02 mm. A) What proportion of ball bearings are more than 5.03 mm?
What are the mean and standard deviation of the proportion of clients in this group who may not make timely payments?
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