Part A. The Importance of Descriptive Statistics
The average or the mean of the students scores is 39.14. Calculating the mean is
the best way to find the ordinary average. The average is not necessarily the same as the
majority, either, which is measured
6. The mean, median and mode all fall at the same midpoint in a normal curve. A
normal curve is symmetrical. The mode is the highest point in the curve, which
falls at the midpoint. The midpoint is the median value and the mean also fall
1. Define the following terms in your own words:
a) A statistical procedure for deciding whether the outcome of your study
supports a particular theory.
b) The .05 significance level is when the null hypothesis is rejected because
Week 6 Exercises
1. Alpha is the probability of making a type I error, which is rejecting the null
hypothesis when the null hypothesis is actually true.
Beta is the probability of making a type II error, which is failing to reject the null