applet access: http://www.zoology.ubc.ca/~whitlock/kingfisher/CIMean.htm

1. Play with this applet for a while, and complete the tutorial. Note that although the population parameter is given, it is not used in computing the intervals. Why is the value of not used in practice?

2. What statistic is used to estimate ?

3. In this Lab, obtain many 95% confidence intervals, each based on a given sample size n (starting with n = 10). Keeping the values of the mean = 105 and standard deviation = 30 fixed, create 95% confidence for each of twenty samples of size n = 10 by clicking "Repeated Samples" and stopping when the number of "Successes" and "Failures" sum totwenty. Are all the confidence intervals the same width?

4. How many of the twenty 95% confidence intervals you saw in the previous part are "Successes" in that they contain ?