Answer Happy

0 Question 19 2.5 pts Which of the following is true? O The sample mean is sometimes a biased estimator of the population mean. O A regression coefficient can never be less than - 1. If the correlation coefficient for two variables Y and X is 0.20, then the percentage of variation in Y left unexplained by X would be equal to 96%. O An unbiased estimator is one that completely eliminates sampling error. O A random sample eliminates sampling error. Question 20 2.5 pts In forecasting the trend in sales from time series data with a simple linear regression equation, the dependent variable would be time. O True O False Question 21 2.5 pts In a symmetric distribution, the first quartile will always equal the third quartile. O True O False