By Glen McPherson

This quantity examines using information in medical research.

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B) Compute the interquartile range and difference between the 95th and 5th percentiles for each sex. (c) Briefly describe the differences in characteristics of energy intake between the samples of boys and girls which is contained in the information obtained in parts (a) and (b). 3 and record percentage monthly increases in property values for 28 properties in a city. 74 (a) Order the data from smallest to largest value and construct a line diagram. 8). 9). 31 Problems 1. 6 comprises two sets of 120 readings summarized in frequency tables.

5. (c) Briefly describe the differences in energy intake patterns for boys and girls in the study. 1, plot prerace versus post-race readings for each of the variables. Is there evidence of a relation between pre- and -post race levels of any of the variables? If there is, explain the nature of the relationship. 1. 1, prepare a frequency table with the following structure. Attitude ~::i~· I Pain Reaction 1 I I I• I• I 2 3 (b) Alter the table to present the information as percentages which sum to 100 across each row.

5) Sample variance. 6). s 2 = [(Yl- fi) 2 + (Y2- fi) 2 + · · · + (Yn- Y) 2]/(n- 1) n = L(Yi- fi) 2 /(n- 1). 6) i=l This provides a measure of variability in the set of numbers. Sample standard deviation. The square root of the sample variance is termed the sample standard deviation and is denoted by the symbol s. 5. Illustration. 85 respectively. 24 1. 10 CHARACTERIZING THE PATTERN OF VARIATION Individual statistics such as the mean and the median each provide information on a specific property of a set of data.

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