You decide to order 32 pizzas from Pizza Hut and record the…

You decide to order 32 pizzas from Pizza Hut and record the delivery times. For the 32 pizzas, the average delivery time turns out to be 29 minutes with a sample standard deviation of 2.5 minutes. (a) Would you use a Normal Distribution or T-Distribution to calculate a confidence interval for this example?  [type] (b) What is a 90% confidence interval for the true average delivery time for Pizza Hut ? [conf]  

The following table shows data collected for hours spent onl…

The following table shows data collected for hours spent online and test scores for various students.    Hours spent online (x) Test Score (y) 0 96 1 85 2 82 3 74 3 90 5 81 5 83 7 75 10 50 (a) Find the equation of the regression line that relates test scores to the hours spent online.  [equation] (b) Predict the test score for a student that spends 6 hours online. [predict]