. It is possible to obtain a quick and dirty estimate of the mean of a normal distribution from the fiftieth percentile value on a normal probability plot. Provide an argument why this is so. It is also possible to obtain an estimate of the standard deviation of a normal distribution by subtracting the sixty-fourth percentile value from the fiftieth percentile value. Provide an argument why this is so.

Test Statistic measures how far the sample data diverge from what we would expect should the null hypothesis be true So, a test statistic with a high magnitude would show that the date is not consistent with H o P-values the probability (when H0 I true) that the test statistic takes a value that is as extreme or more extreme than what is observed A small p value means stronger evidence against Ho provided by the data, and you reject the null hypothesis Significance levels Denoted by Used as evidence for or against H 0 If a p value is smaller than , we reject H o If the p value is larger that , we fail to rejectoH If a significance level is not given, always assume = .05