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  3. the following data are the ages (in years) at diag

The following data are the ages (in years) at diagnosis for 20 patients under treatment for...

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Basic Math

The following data are the ages (in years) at diagnosis for 20patients under treatment for meningitis: 18 18 25 19 23 20 69 18 2118

20 18 18 20 18 19 28 17 18 18

(a) . Calculate and interpret the values of the samplemean, variance, and standard deviation.

(b) . Compute the sample median. Why might yourecommend it as a measure of centre rather than the sample mean?2

(c) . Compute the upper fourth, the lower fourth, andthe fourth spread. (d) . Illustrate the center, spread,and symmetry or skewness of this data using a horizontal modifiedboxplot.

Answer & Explanation Solved by verified expert
4.3 Ratings (869 Votes)
aFollowing table shows the calculationsXXmean21817222518172225258122519992252307225204622569219492251817222521132251817222520462251817222518172225204622518172225199922528342225172652251817222518172225Total443245455Sample mean shows    See Answer
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