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in this video I would demonstrate how to do the Z tests to sample for means tool now this tool will compute a Z value between two means when the population variances are known so in this case we have cholesterol measures for males and females and we want to compare them to see if theyre docHubly different we have the population variance for a female cholesterol level and we have the population variance for male cholesterol level so in order to perform this group comparison we want to go to the data tab and then go to the data analysis tool and in our menu we want to find the Z test to sample for means highlight that and then click OK now the first step is to indicate the data range for variable 1 so we want to click the ref edit button we want to highlight the data for our first variable including the label at the top of the column and click the write data button and then we do that for our second group of data in this case the male data and we perform the same function and clic