A survey of 1001 adults taken by Associated Press Ipsos asked How accurate are the weather forecasts in your area? (San Luis Obispo Tribune, June 15, 2005). The responses are summarized in the table below. Extremely 4% Very 27% Somewhat 53% Not too 11% Not at all 4% Not sure 1% a. Construct a pie chart to summarize this data. b. Construct a bar chart to summarize this data. c. Which of these chartsa pie chart or a bar chart best summarizes the important information? Explain.

ST 512 Week 12 Notes MaLyn Lawhorn October 30, 2017 and November 1, 2017 Analysis of Covariance Model (ANCOVA) An ANCOVA model is one in which the experimental and confounding factors do not interact. We have three different categories of terms in the model ▯ Y -response variable ▯ X ;1▯▯ ;X -erperimental factors ▯ Z 1▯▯▯ ;Z -csnfounding factors The model itself is of the form iid 2 Y = ▯ (e ;x1;▯▯2 ;x ) + r (z ;zc;▯1▯ 2z ) + E s E ▯ (0;▯ ): We use the ANCOVA model as opposed to the one-way model when there are factors that are un- related to the experimental variables. The one-w