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A one-way analysis of variance was conducted. The results of the ANOVA were significant, Fp (2, 432) = 3.75, = .03. A pairwise comparison of group means was conducted. Based on this information, which pairwise comparison test is the "best" choice and most widely used in educational research?
If a random sample of 200 test runs of the service reveal an average of 8 minutes to fill in the electronic application and standard deviation =3 minutes, construct a 75% confidence interval for µ.
(a) Find the lower and upper quartiles, median, and interquartile range. Check for any outliers and interpret. (b) Construct a box plot and interpret. (c) Are there any outliers?
Why might you expect a negative correlation between class size and test score? And would this negative correlation necessarily show that smaller class sizes cause better performance?
The firm plans on selling the machine at the end of three years for $1500 and recovering their investment in net working capital at that time as well.
Multiple averaging methods have been used to forecast weekly demand using 1 year's worth of weekly actual demand data.
A sample of size n = 14 is selected from a normal population to construct a 95% confidence interval estimate for a population mean. The interval was computed to be (7.82 to 9.64). Determine the sample standard deviation.
At a party, everybody shook hands exactly once with everybody else. There were a total of 66 handshakes. How many people were at the party?
Construct a 90 percent confidence interval for the proportion of all depositors who ask for cash back. (Round your answers to 4 decimal places.)
In general, how does increasing the sample size affect the standard deviation of the sampling distribution of possible sample means?
Lunchtime. Does how long children remain at the lunch table help predict how much they eat? The table gives data on 20 toddlers observed over several months.
Identify and interpret the p-value for the test, then construct and interpret the 90% confidence interval for the difference between the population proportions.
Because we usually control the value of a, one could simply set the probability of a type I error to a very small value, say 0.0001. What's wrong with given strategy?
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