You are planning on stocking your grocery counter with chewing gum but want to know if customers really want this product. The other branches of this store (population) sell on average 10 packs of gum...

You are planning on stocking your grocery counter with chewing gum but want to know if customers really want this product. The other branches of this store (population) sell on average 10 packs of gum per customer every 2 months (population average). You have limited time and limited money so you survey a very small sample of your customers, n = 15. You ask them how often they have purchased gum in the last 60 days. You want a 95 % confidence level (α = 0.05) that all of your customers (population) will also purchase on average 10 packs every 2 months. Test to make sure the average result you calculate for your customers is in fact statistically significantly different from the population average of 10 packs per customer every 60 days. The data is listed below: Number of packages of gum purchased in the last 60 days