Department

AnthropologyCourse Code

ANT371H1Professor

Holly WardlowECO220 Midterm Test (December 16, 2005) PART I of II Page 3 of 8

(4) Based on the tabulation of the variable X below, what is the sample median of X?

x | Freq. Percent Cum.

------------+-----------------------------------

1 | 2,570 4.60 4.60

2 | 20,216 36.17 40.77

3 | 19,944 35.69 76.46

4 | 9,041 16.18 92.64

5 | 2,896 5.18 97.82

6 | 859 1.54 99.35

7 | 253 0.45 99.81

8 | 71 0.13 99.93

9 | 27 0.05 99.98

10 | 8 0.01 100.00

11 | 2 0.00 100.00

------------+-----------------------------------

Total | 55,887 100.00

(a) 2

(b) 2.5

(c) 3

(d) 5.5

(e) 6

(5) Consider data measuring the grades (X) of a sample of 132 University of Toronto students and

their salaries 5 years after graduation (Y). You compute a sample covariance of 249.92 (cov(X,Y) =

249.92). What can you reasonably conclude about the sample based on this statistic?

(a) There is a strong linear relationship between grades (X) and salary (Y)

(b) There is a weak linear relationship between grades (X) and salary (Y)

(c) There is no linear relationship between grades (X) and salary (Y)

(d) There is a positive relationship between grades (X) and salary (Y)

(e) None of the above

(6) Suppose X is a normally distributed variable with mean 10 and variance 20: X ~ N(10, 20). What

is the probability that X is negative (rounded to nearest hundredth)?

(a) 0.00

(b) 0.01

(c) 0.04

(d) 0.48

(e) None of the above

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###### Document Summary

Eco220 midterm test (december 16, 2005) part i of ii page 3 of 8 (4) based on the tabulation of the variable x below, what is the sample median of x? x | freq. Total | 55,887 100. 00 (a) 2 (b) 2. 5 (c) 3 (d) 5. 5 (e) 6 (5) consider data measuring the grades (x) of a sample of 132 university of toronto students and their salaries 5 years after graduation (y). You compute a sample covariance of 249. 92 (cov(x,y) =

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