This applet illustrates how sample size is related to the width of a 95% confidence interval estimate for a population proportion. (a) At 95% confidence, how large a sample should be taken to obtain a margin of error of 0.023

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Graph the equation by plotting point x=2

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling