Asimple linear regression model was used to describe the relationship between y 5 hardness of molded plastic and x 5 amount of time elapsed since the end of the molding process. summary quantities included n 5 15, ssresid 5 1235.470, and ssto 5 25,321.368.

a. calculate a point estimate of s. on how many de- grees of freedom is the estimate based?

b. what percentage of observed variation in hardness can be explained by the simple linear regression model relationship between hardness and elapsed time?

Financial performance is measured in many ways. requirements 1. explain the difference between lag and lead indicators. 2. the following is a list of financial measures. indicate whether each is a lag or lead indicator: a. income statement shows net income of $100,000 b. listing of next week's orders of $50,000 c. trend showing that average hits on the redesigned website are increasing at 5% per week d. price sheet from vendor reflecting that cost per pound of sugar for the next month is $2 e. contract signed last month with large retail store that guarantees a minimum shelf space for grandpa's overloaded chocolate cookies for the next year