16. What is random variable? Give an example of a discrete random variable 17. W

Question

16. What is random variable? Give an example of a discrete random variable 17. What is a discrete probability distribution? What are the two conditions that a prob- ability distribution must satisfy? 18. If the coefficient of determination is close to 1, then (a) the linear correlation coefficient is close to zero. (b) the least squares regression line equation explains most of the variation in the response variable. (c) the sum of the square residuals is large compared to the total variation. (d) the least squares regression line equation has no explanatory value 19. An influential observation is an observation that significantly affects (a) the slope of the least squares regression line. (b) the median of the response variable. (c) the mean of the response variable. (d) the median of the predictor variable.

Explanation / Answer

Random variable is a varaible whose posssible values are outcome of a random phenomenon or event .

Examples of discrete random variable are

1. Number of heads when tossing a coin 10 times

2. Outcome of a fair die

3. Number of males in a family

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