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.
next page