Mark Gershon, owner of a musical instrument distributorship, thinks that demand for guitars may be related to the number of television appearances by the popular group Maroon 5 during the shown in the following table 4 3 6 7 9 5 4 66 5 11 7 Maroon 5 TV Appearances Demand for Guitars This exercise contains only parts b, c, and a b) Using the tas-squares regression method, the equation for forecasting around your responses to four decimal placea) Y-2.1286 +0.7714 X c) The estimate for guitar salos Maroon 5 performed on TV 10 times – P.84 sales (round your response to two decimal places). d] The correlation coefficient in for this model around your response to four decimal places)

NFL Combine The National Football League (NFL) combine is a forum in which players who want to play in the NFL demonstrate various skills. One skill that is measured is the 40-yard dash. Go to the book’s website to obtain the data file 13_1_23 using the file format of your choice for the version of the text you are using.

(a) What type of variable is 40-yard dash time?

(b) Excluding quarterback (QB), the skill positions are cornerback (CB), safety (S), running back (RB), and wide receiver (WR). Suppose we want to know whether there is a difference between the 40-yard dash times for these positions. What would be the null and alternative hypotheses?

(c) Assuming we treat the players as a random sample of all players in each position, explain why we may use a one-way ANOVA to determine if there is a significant difference between 40-yard dash times for these positions. How many means are being compared?

(d) Does the evidence suggest a difference exists for the 40-yard dash times for the skill positions (except quarterback)? Use the  level of significance.

(e) Draw boxplots of the 40-yard dash times for the skill positions (except quarterback) to support the results from part (d).