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Unformatted text preview: QUEEN MARY, UNIVERSITY OF LONDON MTH 4106 Introduction to Statistics Practical 7 28 February 2012 Todays practical does two different things: plotting the probability density function of some normal distributions for you to insert in your lecture notes (this part continues from Practical 6); plotting three or four variables (this part continues from Practical 3, and will not be covered in lectures). 1 (Plotting the standard normal probability density function) Use Graph Probability Distribution Plot... , click on View Single and then choose the appropriate options for the standard normal distribution. 2 (Plotting another normal probability density function) Now suppose that X N (4 , 25). What interval on the x-axis should lie under 99 3 4 % of the area under the curve? Input the appropriate parameters for Minitab to plot the probability density function of X . Does this graph agree with your prediction above? If not, why not? 1 3 (Printing the graphs) Print off those two graphs, either directly or via the Report Pad . Then Exit from Minitab and start again....
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