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1. A recent study of 50 self-service gasoline stations in the Greater Cincinnati' Northern Kentucky metropolitan area revealed that the mean price of unleaded gas was $2.029 per gallon. The sample standard deviation was $0.03 per gallon.
Determine a 99 percent confidence interval for the population mean price.
2. The Badik Construction Company limits its business to constructing decks. The mean time to construct one of their standard decks is 8 hours for a two-person construction crew. The information is based on a sample of 40 decks recently constructed. The standard deviation of the sample was 3 hours.
Determine a 90 percent confidence interval for the population mean.
Describe how to find Confidence interval on the t-table.
A two-way ANOVA model was used to analyze an experiment with two levels of one factor, three levels of a second factor, and 6 observations per treatment combination.
At the .01 significance level, can we conclude that there is more variation?
A test of hypothesis is conducted at the .05 level of significance to test either or not the population correlation is zero.
The 2009 National Assessment of Educational Progress (NAEP) gave a mathematics test to a random sample of eighth-graders in Texas. The mean score was 287 out of 500. To give a confidence interval for the mean score of all Texas eighth-graders, you..
Hours worked is important predictor of amount of sales.
What type of error would result in that case? Respond to at least two of your classmate's postings.
A corporate executive officer is attempting to arrange a meeting of his three vice presidents for tomorrow morning. He believes that each of these three busy persons, independently of the others
A statistics practitioner conducted a two-factor analysis of variance experiment with a =4, b = 3, and r = 8. The sum of squares are listed here:
If the sample size (n) is large, and the sample is a random sample, then the distribution of the sample mean x-bar is approximately a:
Given the following number of hours between breakdowns for 4 machines, are the machines significantly different? If so, how are they different? Which machine is the best? Which machine is the worst?
From a practical point of view, what is the difference between the frequency distribution and relative frequency distribution? Why is a cumulative relative frequency distribution so much more informative that just the relative frequency distributi..
Penultimate Support Systems makes fairly good speaker and equipment support stands for music groups. The assembly process involves two operations
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