Statistics - Assignment 1

# Statistics - Assignment 1 - √ n classes(c Based on(b plot...

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MAT2378B: Assignment 1 Due date: 23 September 2009 Total number of points: 33 Q 1. (2.1 in the textbook) For parts (a) and (b), (i) identify the variables in the study; (ii) for each variable, write the type of variable (cathegorical/ordinal, discrete etc.); (iii) identify the observation unit; (iv) determine the sample size. (a) A paleontologists measured the width (in mm) of the last upper molar in 36 specimens of the extinct mammal Acropitheus rigidus . (b) The birthweight, date of birth, and the mother’s race were recorded for each of 65 babies. Q 2. The following data describe the number of dendritic branch segments emanating from each nerve cell of guinea pigs: 23 30 54 28 31 29 34 35 30 27 21 43 51 35 51 49 35 24 26 29 21 29 37 27 28 33 33 23 37 27 40 48 41 20 30 57 (a) Construct a dot plot. (b) Construct a frequency distribution with
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Unformatted text preview: √ n classes. (c) Based on (b), plot a histogram. (d) Determine the mean and the median. (e) Construct a boxplot. Q 3. (2.32) In a study of milk production in sheep, a researcher measured the three-month milk yield for each of 11 ewes. The yields (in liters) are as follows: 56.5 89.8 110.1 65.6 63.7 82.6 75.1 91.5 102.9 44.4 108.1 (a) Determine the median and the quartiles. (b) Determine the interquartile range. (c) Construct a (modiﬁed) boxplot. Q 4. Dopamine is a chemical that plays a role in the transmission of signals in the brain. The dopamine levels in seven rats were as follows: 6.8 5.3 6.0 5.9 6.8 7.4 6.2 (a) Determine the mean and the standard deviation. (b) Determine the median and the interquartile range. (c) Replace the observation 7.4 by 10.4 and repeat parts (a) and (b). Comment...
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## This document was uploaded on 01/16/2011.

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