1 The sample size must be increased by a factor of to decrease the margin of error by a factor of 2 (Type a whole number.)

In a t-test of difference between means, increasing sample size will affect the:

A local DMV (location of your choice) wanted to assess the number of mistakes that were made by its operators (aka clerks).  One hundred samples were gathered from each of 20 operators (note: n = 100 for calculation of σp but you will need 100 * 20 to calculate p-bar).  The results are shown in the table below.  The DMV wants to set control limits to include 95% of the random variation.   Operator # Number of errors Fraction defective Operator # Number of errors Fraction defective 1 6   11 6   2 5   12 1   3 0   13 8   4 1   14 7   5 4   15 5   6 2   16 4   7 5   17 11   8 3   18 3   9 3   19 0   10 2   20 4       Calculate p-bar and σp.  Complete the fractions defective in chart. Compute the control limits and center line for a p-chart. Plot the fraction defective in a p-chart and decide if the performance of the operators is…

Regarding the test of significance for the usefulness of the predictor variables x1, x2, and x3 in predicting y, which of the three sums of squares figures in its calculaton?