Question: Refer to the data given in Exercise 13.97 on the number of times a specific product is promoted on the intercom system in a supermarket

Refer to the data given in Exercise 13.97 on the number of times a specific product is promoted on the intercom system in a supermarket and the number of units of that product sold. Make a 90% confidence interval for the mean number of units of that product sold on days with 35 promotions. Construct a 90% prediction interval for the number of units of that product sold on a randomly selected day with 35 promotions.

Number of Promotions per Day 15 Number of Units Sold per Day (hundreds) 42 30 18 12 38 30 26 17 15

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