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A random sample of 41 children (all 5 years of age) was selected and given the Reading test of the WRAT (Wide Range Achievement Test). The sample mean was 20.57 and the estimated standard error of the mean was 1.98. Test whether the sample could be representative of a population whose mean was 23.52. Report the t-value, whether you accept or reject Ho, and whether the difference was significant in a brief sentence.
The ages of cars owned by all employees of a large company have a bell shaped distribution with a mean of 8 years and a standard deviation of 2 years. Using the empirical rule, find the approx. percentage of cars (owned by those employees) that are b..
The student with the 92 found a grading error on her exam and her correct grade was 95. There were no other grading errors. After correcting this student's paper, the five number summary for the midterm exam will be
You have two unbiased estimates, e 1 and e 2 , of a quantity with variances V 1 and V 2 respectively, and covariance Cov {e1,e 2 } = C. Form a new unbiased estimate:
Create a 99% confidence interval estimate of population mean amount of paint included in a 1 gallon can.
Ninety of the sample students are in the Business College, 120 are in the Liberal Arts College, and 90 are in the Education College.
In this paragraph, be sure to make it clear how you handled the issue of conducting three planned comparisons. Also provide the ANOVA summary table for these results.
Find the probability that exactly 15 flights arrive on time.
What is the approximate permutation test P-value and What is the permutation test P-value for testing the equality of the means versus the hypothesis that the mean change for the treatment group is larger than the mean treatment for the control gro..
Using the simple test of independence (described in the lecture), decide if the events high calorie and high fiber are independent or dependent. Show your work.
If garage is robbed, determine the probability doors were left open?
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
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