stat 1213 / Final / 1998 December 8 / page 2
 
PART II [25]
(A)
  4 | 7 7 8 8 9 9
  5 | 0 2 2 2 3 3 4 4 5 6 6 6 7 7 8 8 8 9
  6 | 0 0 1 1 1 2 2 2 2 2 2 3 3 4 4 4 5 5 6 6 7 7 7 7 8 8 8 8 8 8 9
  7 | 0 0 0 1 1 1 2 2 2 3 4 4 4 5 5 6 7 7 9
  8 | 0 2 3 5 6                                               
The largest number of this stem & leaf diagram is 860 The standard deviation is nearest
(a) 1 (b) 2 (c) 10 (d) 30 (e) 100 (f) 300 (g) 1000
 

(B) Which of these questions does a (statistical) test of significance address?
____ (a) Could the difference be due to chance?
____ (b) Is the difference important?
____ (c) What does the difference mean?
____ (d) Was the experiment properly designed?
____ (e) What is the probability the null hypothesis is true?
 
(C) The first quatrile of a normal distribution with zero mean and standard deviation one is nearest
(a) -1  (b) -0.7  (c) 0.25  (d) 0.68  (e) 1
 
(D) A survey is to be made to determine the amount of Z (pick your own product) used weekly by students of U.X.Y. A preliminary survey of Fifty (N=50) provides a confidence iterval of
10 ± 6
A precision of ±2 (rather than ±6) is wanted. What sample size is needed to accomplish this?
__________

(E) In an experiment with treatment being compared to control by a statistical test of significance, failing to reject the null hypothesis implies which two of these?
(a) ____ Treatment and control can be distinguished.
(b) ____ Treatment and control cannot be distinguished.
(c) ____ Treatment and control are the same.
(d) ____ The data could reasonably have come from a random source.
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