Chapter 4-1. Sample Size Determination and Power
... of matched samples (1 case to 1 control, or pre and post measures on the same individuals) under the assumption of proportional odds. This approach, although not specifically tailored to the Wilcoxon signed ranks test, provides a reasonable approximation for the required sample size of the Wilcoxon ...
... of matched samples (1 case to 1 control, or pre and post measures on the same individuals) under the assumption of proportional odds. This approach, although not specifically tailored to the Wilcoxon signed ranks test, provides a reasonable approximation for the required sample size of the Wilcoxon ...
KEY to exam 8-11-06 (34 Kb ) STT 315 Summer 2006
... recognizable elements of your sketch. Bell curve with mean 7 and sd = Sqrt[7]. e. To approximate p(5) = P(X = 5) using (b) and the continuity correction, we require two standard scores. Give one of these standard scores, but do not calculate it out or use the z-table. Scores are (4.5-7)/Sqrt[7] and ...
... recognizable elements of your sketch. Bell curve with mean 7 and sd = Sqrt[7]. e. To approximate p(5) = P(X = 5) using (b) and the continuity correction, we require two standard scores. Give one of these standard scores, but do not calculate it out or use the z-table. Scores are (4.5-7)/Sqrt[7] and ...
Estimating with Confidence
... • Based on the sampling distribution of x-bar, the unknown population mean will lie in the interval determined by the sample mean, x-bar, 95% of the time (where 95% is a set value). • In the example to the right, only 1 out of 25 confidence intervals formed by x-bar does the interval not include the ...
... • Based on the sampling distribution of x-bar, the unknown population mean will lie in the interval determined by the sample mean, x-bar, 95% of the time (where 95% is a set value). • In the example to the right, only 1 out of 25 confidence intervals formed by x-bar does the interval not include the ...
Confidence Intervals
... A very good way to think of what confidence means—say, "90% confidence"—is this thought experiment. I have a barrel, filled with black marbles and white marbles, mixed thoroughly together. You know that 90% of the marbles in the barrel are white and 10% are black. Reach into the barrel and take a ma ...
... A very good way to think of what confidence means—say, "90% confidence"—is this thought experiment. I have a barrel, filled with black marbles and white marbles, mixed thoroughly together. You know that 90% of the marbles in the barrel are white and 10% are black. Reach into the barrel and take a ma ...
Biased and Unbiased Estimation of the Circular Mean Resultant
... In many applications, the MRL is used to test if there is a strong preferred direction in measured data. It is argued that this is the case if the sample MRL exceeds a certain threshold which is chosen arbitrarily. However, due to the MRL’s variance and bias, such a strategy can be misleading, espec ...
... In many applications, the MRL is used to test if there is a strong preferred direction in measured data. It is argued that this is the case if the sample MRL exceeds a certain threshold which is chosen arbitrarily. However, due to the MRL’s variance and bias, such a strategy can be misleading, espec ...
