Business Analytics

1. Which of the following is not one of the assumptions of regression? a. There is a population regression line b. The response variable is normally distributed c. The standard deviation of the response variable increases as the explanatory variables increase d. The errors are probabilistically independent 2. The error term represents the vertical distance from any point to the a. estimated regression line b. population regression line c. value of the Y’s d. mean value of the X’s 3. Which ...

1. The chi-square and F-distributions are used primarily to make inferences about population ___________. a. means b. variances c. medians d. modes e. proportions 2. When we replace with the sample standard deviation (s), we introduce a new source of variability and the sampling distribution becomes the: a. t -distribution b. F- distribution c. chi-square distribution d. normal distribution 3. The t-distribution for developing a confidence interval for a mean has degrees of freedom. a. n 2 b...

1. The standard error of sample mean is large when the observations in the population are spread out (large ), but that the standard error can be reduced by taking a smaller sample. a. True b. False 2. A sample in which the sampling units are chosen from the population by means of a random mechanism is a a. probability sample b. judgmental sample c. stratified sample d. systematic sample 3. A judgmental sample is a sample in which the a. sampling units are chosen using a random number table b....

1. Probabilities that cannot be estimated from long-run relative frequencies of events are a. objective probabilities b. subjective probabilities c. complementary probabilities d. joint probabilities 2. The probability of an event and the probability of its complement always sum to a. 1 b. 0 c. any value between 0 and 1 d. any positive value 3. If events A and B are mutually exclusive, then the probability of both events occurring simultaneously is equal to a. 0.0 b. 0.5 c. 1.0 d. any value be...