Refer to Exercise 9. a. Find the mean of the total number of unacceptable bolts (those that are classified as either downgraded or scrap). b. Find the variance of the total number of unacceptable bolts. c. Find the probability that the total number of unacceptable bolts is exactly 5.

Chapter 5 Bivariate Data two variables for on individual to find a relationship between one another When analyzing describe each variable and describe the relationship Explanatory variable X, used to predict, independent Response variable Y, dependent Scatterplot the variables measured by the same individual Linear relationship straight line Nonlinear relationship a relationship but not at all a straight line Positive Y increases as x increases Negative Y decreases as x increases Correlation Coefficient calculate r, measures the strength of the linear relationship, strength plus the direction the graph is going Cross Product Sxy the sum of the relationship, when the variables are not related, or when both have a positive or negative relationship How outlier