Kruskal-Wallis test with ties.

An experiment is performed twice, each with $5$ outcomes

$x_i,\;y_i,\;i=1,\dots 5$ . Find mean and s.d. of their differences $y_i-x_i,\;i=1,\dots 5$.

Calculate the Pearson correlation coefficient on paired data and comment on the significance.

Calculate the Pearson correlation coefficient on paired data and comment on the significance.

Spearman rank correlation calculated. 10 paired observations.

Spearman rank correlation calculated. 8 paired observations.

Find a regression equation given 12 months data on temperature and sales of a drink. 

Find a regression equation.

Now includes a graph of the regression line and another interactive graph gives users the opportunity to move the regression line around. Could be used for allowing users to experiment with what they think the line should be and see how this compares with the calculated line.

Paired t-test to see if there is a difference between responses after treatment.

Testing an hypothesis about the mean of one group.

Testing an hypothesis about the mean of one group.

Calculating summary statistics.

Paired t-test to see if there is a difference between responses after treatment.

A comparison of the means of four groups.

A comparison of the means of three groups.

A comparison of the means of three groups.

A comparison of the mean of two groups.

A comparison of the mean of two groups.

A comparison of the mean of two groups.

A comparison of the mean of two groups.