More sales and profits Consider again the relationship between the sales and profits of Fortune 500 companies that you analyzed in Exercise 40. a) Find a 95% confidence interval for the slope of the regression line. Interpret your interval in context. *b) Last year the drug manufacturer Eli Lilly, Inc., reported gross sales of $9 billion (thats $9,000 million). Create a 95% prediction interval for the companys profits, and interpret your interval in context.
STAT 110 – Notes for Week of 9/20/16 Chapter 11 Continued o Stemplot: essentially a histogram turned on its side. It shows the exact values of a distribution. It is used for smaller distributions, since all of the values need to be listed. Also known as a stem-and-leaf plot. o Each observation is separated into a stem (all of the digits of a value except the last digit) and a leaf (the last digit of a value). o There is a line between each stem and the leaf; write each leaf to the right of each stem. For example, if you had the values 40, 42, 43, and 45, the stemplot would say: 4 | 0 2 3 5 . o You also use a stemplot to determine whether a distribution is skew