10.1 Mean sd Known

# Whereas the 20 29 year old age group was purchasing

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Unformatted text preview: xtra distance.” Par would like to demonstrate that their new Par golf balls are superior to the comparable ball made by their competitor, Ace, Inc. In a test of driving distance using a mechanical driving device, a sample of Par golf balls was compared with a sample of Ace golf balls. In a sample of 120 balls, the Par balls averaged 275 yards and in a sample of 80 balls, the Ace balls averaged 258 yards. Based on data from previous driving distance tests, the two population standard deviations are known with σPar = 15 yards and σAce = 20 yards. see MS Excel file Examples.xlsx, worksheet Par Golf Example Hypothesis Tests The local stadium is conducting a study to determine if their new promotional campaign is changing food and beverage purchases. Whereas the 20-29 year old age group was purchasing more items from the concession than the 30-39 age group, the campaign was intended to level out the number of purchases. The data in Concession.xlsx shows the number of items purchased in samples of 50 from the two groups. Previous studies show...
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