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The quality control engineer for a furniture manufacturer is interested in the mean amount of force necessary to produce cracks in stressed oak furniture. She performs a two-tailed test of the null hypothesis that the mean for the stressed oak furniture is 650. What are Type I and Type II errors for this problem?
A 95% confidence interval for is from -2 to 10. What conclusion can we make based on this confidence interval if we test Ho: µ = 0 against H1: µ ? 0 at = 0.05?
What is the Central Limit Theorem? Why is it important in statistical data analysis? How is the rule of thumb used for the application of the Central Limit Theorem?
You are given the following frequency distribution for the number of errors 55 students made in a test:
Construct a frequency distribution (class, tally and frequency) for the data set using the indicated number of classes. In the table, include the midpoint, relative frequencies and cumulative frequencies.
Bob gets tests grades of 86, 92, and 60 He gets an 90 on his final exam. Find the weighted mean if each tests counts for 20%, and the final exam counts for 40% of the final grade.
Two tools that are often used in this process are the contingency table and the decision tree. What are these tools and how to they help us to make decisions under uncertainty when we are dealing with probabilities?
Is there evidence of a difference in objection to sharing information among the organizational groupings? (use α = 0.05)
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. State the null hypothesis and the alternate hypothesis.
Find out the decision strategy company must follow, expected value of strategy, and maximum amount the company must pay market research firm for survey results.
She wants to be 90% confident and be accurate within 5% of the true proportion. Find out the minimum sample size necessary.
Suppose a firm evaluates the productivity of the three shifts of workers who work in their factory. Each shift's performance is measured based on the amount of output that is produced during the shift - day, evening, or swing shift.
The Wilcoxon signed rank statistic, The mean for the Wilcoxon signed rank test and The P-value for the Wilcoxon signed rank test
Inspect table produced in question 2 above. Comment on relative sensitivity of minimum sample size to actual proportion and to desired half width.
Computing the probability values using normal distribution - The data set has a bell-shaped distribution. Between what two prices do 68% of the houses lie?
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