PROBABILITY PLOT MINITAB HOW TO

Because the p-value is 0.463, which is greater than the significance level of 0.05, the decision is to fail to reject the null hypothesis. In these results, the null hypothesis states that the data follow a normal distribution. To see what kind of probability plots can be expected from skewed data generate 100 data points from a Normal Distribution into c1, then let c2 equal c1 squared.

PROBABILITY PLOT MINITAB HOW TO

However, you cannot conclude that the data do follow the distribution.įor information on how to specify different distributions and parameters for the test, go to Fitted distribution lines. use Minitab to produce a normal probability plot for the data, use Excel ® to produce a normal probability plot for the data. P-value > α: Cannot conclude the data do not follow the distribution (Fail to reject H 0) If the p-value is larger than the significance level, the decision is to fail to reject the null hypothesis because you do not have enough evidence to conclude that your data do not follow the distribution. P-value ≤ α: The data do not follow the distribution (Reject H 0) If the p-value is less than or equal to the significance level, the decision is to reject the null hypothesis and conclude that your data do not follow the distribution. Specifying an arbitrary distribution for your probability scale. Placing your probability scale either axis. There are two ways of producing a normal probability plot in MINITAB. They are: Creating percentile, quantile, or probability plots. Note that in MINITAB we can calculate probabilities for any (not just standard). An significance level of 0.05 indicates that the risk of concluding the data do not follow the distribution-when, actually, the data do follow the distribution-is 5%. A closer look at probability plots Overview The probscale.probplot function let’s you do a couple of things. Usually, a significance level (denoted as α or alpha) of 0.05 works well.

To determine whether the data follow the distribution, compare the p-value to the significance level.

Probability plot minitab