Hello, please may I get some help :)
QUESTION 17 Consider the following data X 1 3 4 6 9 8 10 Y 13l15 33 75m) 9s The coefficient of correlation is 1. 0.976 2. 1.00 3. 0.82 4. 0.953 5. 0.88 QUESTION 18 If the coefficient of correlation is r = 0.81, the variances of X and Y are respectively, 20 and 25, then the covariance cot) (x, y) or Sxy must be 1. 405 2. 90.56 3. 1.81 4. 18.11 5. 76.27 QUESTION 19 Use the Wilcoxon Signed Flank Sum Test for the following matched pairs of samples to determine whether the two population locations differ at the 0.10 significance level. Sample191213 8 710 91213 3 7 Sample2l510119l3 9 5l10119 3i Which one of the following statements is incorrect? 1. H0 : The two population locations are the same. H1 : The location of population 1 is different from the location of population 2. 2. T+ = 62 and T = 4. 3. The value of the standardized test statistic Z is 24.1172. 4. The pvalue for a two-tail test is 0.0098. 5. Fleject H0 at 10% level of significance. QUESTION 20 Use the Wilcoxon sign test on the data below to determine at the 5% significance level whether the locations of the two populations differ. Assume that the two samples selected come two popula- tions that are normally distributed. Sample1 32 22 18 29 20 34 25 9 mm-m-Z-S Which one of the following statements is incorrect? 1. The two population locations are the same. 2. The location of population 1 is to the left of the population location 2. 3. The number of positive differences is 7. 4. The test statistic Z is 1.6667 5. The p-value for one-tailed test is 0.095. QUESTION 21 Consider the following statistics T+ = 21, T' = 18 and n = 25. Use the Wilcoxon signed rank sum test for the paired differences. The pvalue for a twotailed test is 1. 21 2. -3.80'?3 3. 0.0000 4. 0.05 5. 0.9875 QUESTION 22 Consider the following time series Period Time series 48 The four-period centered moving average to time period 3 is 1. 37 2. 36.6? 3. 35 4. 38 5. 35.25 QUESTION 23 Consider the following information The mean absolute deviation MAD is 1. 552 2. 9.6 3. 48 4. 98 5. 96 QUESTION 24 A share trader has a policy of selling a share if its share price drops more than one-third of its purchase price. In January, the investor bought shares in Netron (an electronic company) for 90c per share. The table below shows the price of the Netron share at the end of each month. Month l Jan l Feb l Mar l Apr May Jun l Jul l Share price 90 82 78 80 74 76 70 The three-period moving average of the share price in April is 1. 83.3 80 75.6 76.7 91.4393!\" 77.33 QUESTION 25 Use the exponential smoothing with w = 0.1 to detect the components of the following time series. Period: 1 2 3 4 5 Timeseries: 63 72 86 71 60 The exponential smoothed value at period 3 is 1. 86 66.11 66.60 65.94 9153939: 54.5
