MATH 227 STATISTICS FINAL EXAM - West Los Angeles College

More documents

Recommendations

Info

77. Find the 50th percentile of the above data set. What is another name for this value a) 15.8, mode b) 15.8, median c) 20.2, range d) can’t tell 78. Considering this sample of data provided, would you describe this data set as skewed If so, why If not, why not a) no, since x = P50 b) yes, skewed left, since x < P50 c) yes, skewed right, since x < P50 d) yes, skewed right, since x > P50 e) none of the above 79. Which formula should be used here to find a confidence interval for the population mean µ x σ x s s a) x ± z c b) x ± zc c) x ± t c d) none of these n n n 80. Construct the 95% confidence interval for the population mean µ x . a) 15 .91± 4. 33 b) 15 .91± 3. 68 c) 15 .91± 1. 44 d) 15 .91± 4. 245 e) 15 .91± 4. 49 12
81. In the formula for 2 s , the denominator is −1 n rather than n because 2 σ x a) dividing by n underestimates 2 b) dividing by n overestimates σ x c) it becomes an unbiased estimator of d) a and c e) b and c 2 σ x 82. Which of the following is a measure of relative standing a) standard deviation b) range c) z-score d) t-distribution 83. If the distribution of the random variable is _______, it is a continuous random variable. a) binomial b) normal c) t d) a or b e) b or c 84. If X is a continuous random variable with mean µ x = 10. 0 , is the following statement true Explain why or why not. P( X = 10. 0) = . 5 a) yes, the probability of the mean is always .5. b) yes, according to the Central Limit Theorem c) no, the probability should be 0, because the “area” of a line is 0. ⎛ n ⎞ d) no, since we don’t know n, we can’t compute ⎜ ⎟ ⎝10⎠ 13
Page 1 and 2: MATH 227 STATISTICS FINAL EXAM M227
Page 3 and 4: 12. The large sample z test for µ
Page 5 and 6: 37. A discrete numerical variable i
Page 7 and 8: 51. Chebychev's Rule states that th
Page 9 and 10: 60. In the construction of confiden
Page 11: For problems 70 through 80, conside
Page 15 and 16: For problems 91 through 94, conside
Page 17 and 18: PART III: SHOW ALL WORK FOR FULL CR
Page 19 and 20: 3.) Sample bivariate data indicates
Page 21 and 22: EXTRA CREDIT) Many people believe t

MATH 227 STATISTICS FINAL EXAM - West Los Angeles College

Create successful ePaper yourself

Delete template?

Save as template?