Statistical Test Practice

What p-value cut-off for statistical significance do we use in biology?

0.05

If you get a p-value under 0.05 for a test, do you accept or reject the null hypothesis?

Reject Null

If you get a p-value over 0.05 for a test, do you accept or reject the null hypothesis?

Accept Null

What is the null hypothesis of the Shapiro-Wilks test?

The dataset is normally distributed

What is the null hypothesis of a t-test?

There is NO significant difference between the means of the two datasets

What is the null hypothesis of an F-test?

The two datasets have equal variances

What is the null hypothesis of a Pearson Correlation test?

There is NOT a statistically significant linear correlation between the two variables

What is the range of the Pearson correlation coefficient (r value)?

-1 to 1

What does an r value close to zero indicate?

Weak or no correlation between the two variables

What does an r value close to 1 indicate?

Strong positive correlation between the two variables

What does an r value close to -1 indicate?

Strong negative correlation between the two variables

Positive correlation means?

Both variables increase or decrease together

Negative Correlation means?

One variable increases as the other decreases