Lies, damn lies, and statistics! [HELP!]

Ok, I have a test on Monday for statistics. It's a repeat I have to do in order to get into second year of my course.
The reason I didn't pass the test first time round was due to my bike accident, and I couldn't attend any of the lectures.
So I am sitting here up to my elbows in web pages and books but I understand very little of it as there is no one here to help me!

i have got some of the past papers, and the questions are the same every year, with only the numbers changed, so I know what I have to learn. The problem is I don't understand it!

If anybody out there could give me a bit of help, or maybe direct me to a website you know is good, and has worked examples I would be emensly grateful!

The things I will need to learn are;

Stats Past paper wrote:

Construction of a stem and leaf diagram, commenting on the shape of distribution, obtaining the values for the mean and median. Constructing a frequency distribution table and drawing a histogram.

<<<< This section I am ok with.<<<<

Stats Past paper wrote:

When is a t-test appropriate, what are the types of t-test and what may be used instead of a t-test. Carry out a t-test. Summarise findings and describe any assumptions made.

Stats Past paper wrote:

What type of data is used in a Chi-Square test and how is it used in statistical analysis. What are the main differences between goodness of fit, and test of association. Using the appropriate test, see if there is an association between 3 variables with 2 outcomes.

Stats Past paper wrote:

Plot a scatter graph, claculate the regression line. Using the equation of regression to help plot regression line on scatter diagram. What is provided by the pearson correlation coefficient. Use the regression equation to predict values.

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