STAT 303, 503-504, Spring 1996
Prof. H. Joseph Newton

Exam 1 Results

Correct Answers

  1. (#12 on form B) c, d
  2. (#13) sampling without replacement
  3. (#14) (a) mean decreases by 2,000, (b) median stays the same
  4. (#4) R^2 is between 0 and 1
  5. (#11) a
  6. (#6) .9899 for form A, .9066 for form B
  7. (#7) -.74 for form A, -.18 for form B
  8. (#8) any three of mu=population mean, sigma=population standard deviation, sigma^2=population variance, pi=proportion of 1's in a 0-1 population
  9. (#9) Any 2 of a, b, c
  10. (#10) c, f (not a because it's sampling without replacement)
  11. (#11) (a) slope=33.0199, intercept=-3186.05, (b) I accepted any r between .5 and .9, (c) intercept is value of y (weight) when x (length) is 0 and a car having length 0 makes no sense.
  12. (#1) (a) at least 75 % (note that sigma=2), (b) is 95%
  13. (#2) a and d
  14. (#3) average value=1(.2)+2(.2)+3(.2)+4(.2)+5(.1)+6(.1)=3.1
  15. (#15) sort the digits of your ID, then get Q1=median of 5 smallest digits and Q3=median of 5 largest digits, and then IQR=Q3-Q1

Results


Mean=63.12, Std. Dev=16.60 
Q1=52, Q2=64, Q3=74, IQR=22

  2* | 4
  2. | 6
  3* | 04
  3. | 66888
  4* | 04
  4. | 66899
  5* | 000222244
  5. | 6666688
  6* | 0002222334444
  6. | 668889
  7* | 0000012344444
  7. | 666688
  8* | 0014
  8. | 568
  9* | 02244
  9. | 8

The Curve!

A: 80-100 (13)
B: 65-79  (25)
C: 46-64  (34)
D: 34-45   (8)
F: <34     (3)