Illustration 20.3. The mean weekly sale of the Yum Yum choco- late bar in a chain of candy stores was 146.3 bars per store. After an advertising campaign the mean weekly sales in 22 stores for a typi- cal week increased to 153.7 and showed a standard deviation of 17.2. Is the evidence conclusive that the advertising was successful? You• are given that for 21 degrees of freedom, the value of t is 2.08 at 5% level of significance.

Illustration 20.3. The mean weekly sale of the Yum Yum choco- late bar in a chain of candy stores was 146.3 bars per store. After an advertising campaign the mean weekly sales in 22 stores for a typi- cal week increased to 153.7 and showed a standard deviation of 17.2. Is the evidence conclusive that the advertising was successful? You• are given that for 21 degrees of freedom, the value of t is 2.08 at 5% level of significance.

Mathematics For Machine Technology

8th Edition

ISBN:9781337798310

Author:Peterson, John.

Publisher:Peterson, John.

Chapter28: Degree Of Precision, Greatest Possible Error, Absolute Error, And Relative Error

Section: Chapter Questions

Problem 52A

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