Correlation Test Example. P value tdist 4 737 48 1 9 8e 06 05 α one tail tcrit tinv 2 05 48 1 677 4 737 tobs. To find out if there is a correlation between gender and class participation you observe college seminars note the frequency and duration of students contributions and categorize them based on gender.
You statistically analyze the data to determine whether men are more likely to speak up in class than women. And so we reject the null hypothesis and conclude there is a non zero correlation between poverty and infant mortality. The value of the test statistic t is shown in the computer or calculator output along with the p value.
Pearson s correlation coefficient can be positive or negative.
An example of negative correlation would be the amount spent on gas and daily temperature where the value of one variable increases as the other decreases. Pearson r correlation is the most widely used correlation statistic to measure the degree of the relationship between linearly related variables. And so we reject the null hypothesis and conclude there is a non zero correlation between poverty and infant mortality. Growth in obesity is positively correlated to growth in consumption of junk food.
