This identifies whether the individual values are closely distributed around the mean, or whether they are widely dispersed. StatPlus:mac LE results for age of inhabitants in my street.Īnother way of looking at the distribution of data is to calculate the standard deviation. It is the relationship between the median, mode and mean that can be helpful to us in getting to know the profile of ages or indeed of other observations. The mean of 28.4 has been dragged upwards because of the presence of a few people who are significantly above the ages of the people on my street. What can we conclude from this? Because the most frequently occurred age (mode) was 26, and the median was 23, also below the mean, we know that there were rather more young people on my street. Note that the median and mode give the results that we obtained by inspection, and that the mean is given as 28.4. The results table shows the summary measures of the ages of the age distribution of the people on my street. Under Category select Number and reduce the number of decimals to one. To improve the appearance of your results, select the cells showing your results. Now you should have generated new sheet with a table showing a summary of the analysis of the data including the mean, median and mode. StatPlus:mac LE Descriptive Statistics dialogue box. Open StatPlus from the Applications folder, or if it's already open click on the StatPlus icon in the dock.This is convenient when we are dealing with a very large number of observations. This is not difficult to work out when there are just a few observations, but these measures can be identified very quickly and accurately using the statistics routines embedded in Excel. What is the midpoint (the median age)? There are 77 people on my street, so the median is the middle or the 39th observation. What is the most regularly occurring number (the mode)? It is 26. Here are the ages of the inhabitants of my street in 1881. Median refers to the mid-point of a series of numbers and mode to the most frequent case. The mean is just one type of average, but it is the most widely used and it is easy to calculate. Sometimes you may here these expressed in more formal language: mean life expectancy, mean income, mean age of marriage, and so on. Average incomes, average family size, average life expectancy, average turn out at elections, average mark, and so on, are all part of our everyday vocabulary. Average is probably the measure most used by historians.
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