A. Definitions Plcase detine the folowing terms - use of very common tanguage te

Question

A. Definitions Plcase detine the folowing terms - use of very common tanguage terms is sufficient . Describe the difference between mean and median? (2) What does standard deviation (SD) represent? (1) 2. 3. What is the equation for calculating the standard error of the mean (SEM)? () B. Calculations of Descriptive Statistics 4. White Blood Counts: Listed below are white blood cell counts (1000 cells/uiL) from males and females (from a Data set "Body Data"). Standard Deviations (s) of the two samples are calculated and given below. Calculate a) the Mean (8) b) Median, c) sample size (n). d) variance (s'), e) Coefficient of variation (CV) for each of the 2 groups of data low 8.7 6. 8.1 8.0 63 8.1- 64 6.3. 109t4.8 15.947.2 4.1 5.6 8.3 5.1 9.5 6.1 5.7 5.4 le Male 4.9 7.5 6.1 5.7 Female Male 1571.53 Median cV ) How would you interpret Mean and Median with respect to the two sets of data? g) Which group has greatervariabilityinthe values? How do you know this? Page 1

Explanation / Answer

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1) The "mean" is the "average" you're used to, where you add up all the numbers and then divide by the number of numbers. The "median" is the "middle" value in the list of numbers. ... If no number in the list is repeated, then there is no mode for the list.

For example:

Find the mean, median, mode, and range for the following list of values:

13, 18, 13, 14, 13, 16, 14, 21, 13

The mean is the usual average, so I'll add and then divide:

(13 + 18 + 13 + 14 + 13 + 16 + 14 + 21 + 13) ÷ 9 = 15

Note that the mean, in this case, isn't a value from the original list. This is a common result. You should not assume that your mean will be one of your original numbers.

The median is the middle value, so first I'll have to rewrite the list in numerical order:

13, 13, 13, 13, 14, 14, 16, 18, 21

There are nine numbers in the list, so the middle one will be the (9 + 1) ÷ 2 = 10 ÷ 2 = 5th number:

13, 13, 13, 13, 14, 14, 16, 18, 21

So the median is 14.

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