Hello class, I hope you are all studying for the second exam and preparing for a much deserved spring break. Here is what we discussed this week;

3 ways variables can be related

  Correlations

Critical Values

Spurious Relationships

Central Limits Theorem

Kurtosis & Skewness

Confidence Interval

Null Hypothesis

Type I & Type II errors

Remember, we are taking Tuesday off to study extra hard for the exam that is on Thursday. Please feel free to email me if you have any questions. 

March 4, 2007

Hello Class,
This week we spent some time dealing with descriptive statistics and some inferential statistics. This week week we discussed;

Measures of Central Tendency
Mean
Median
Mode
Measures of Dispersion
Range
Standard Deviation
The Normal Curve
.34
.14
.02

In class we discussed how sometimes it is better to discuss the median or mode of data instead of the mean. For example, when discussing the average college graduates' income, we might want to discuss the median because outliers (such as professional athletes) would skew the mean. Can you think of other examples where we would want to discuss the median or mode instead of the mean?