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Descriptive statistics • • • • • • • • • • • Open file Adstudy.sta Go to Descriptive statistics Find mean with a confident interval 95%, standard deviation, skewdness and kurtosis for all measurements. Make histograms Go to Correlation matrices. Check for all the correlations (Measures#01-24). List all significant coefficients in default setting. Change the confidence interval to p-value<0.01 and list all significant coefficients. Which of these measurements are correlated? Produce a scatterplot between Measures #05 and #09. Do the same for MALE and FEMALE groups separately. Descriptive statistics • • • • • • Test if MALE and FEMALE groups have identical response (ttest for independent samples by groups). Create Box&Whisker plot for Measures# 07, 08, 09. Test other Measures. What do the red lines mean? Go back to Box&Whisker plot and change the Whisker value to the Standard Error. What does the difference in Std.Err. between MALE and FEMALE groups mean? Go to Graph. Make histograms for Measures# 05, 07, 08 and 09 (with normal fit disabled) , and a scatterplot for Measures# 05 and 09 for the whole sample, and separately for MALE and FEMALE groups. Do the same by Advert grouping. Do Measures# 07, 08 and 09 have a normal distribution?