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Normal distribution is a bell-shape histogram, which is centered around the mean. For the normal distribution, 68% of the observation lies within 1 standard deviation of mean, 97% lies within 2 standard deviation of the mean, while 99% lies with 3 standard deviation of mean. Construct the histogram, by going to Data Analysis -> Enter Input Range, Select Chart Output. Then review the data is centered around the mean.
p-value shows the significance level of the variable. It indicates the probability of rejected the null hypothesis.