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A marketing executive is investigating whether this year’s advertising campaign has resulted in greater mean sales...

A marketing executive is investigating whether this year’s advertising campaign has resulted in greater mean sales compared with last year’s mean sales. The executive collects a random sample of 100 customer orders from a large population of orders and calculates the sample mean and sample standard deviation.

Which of the following is the appropriate test for the executive’s investigation?

a)A one-sample z-test for a population mean

b)A one-sample t-test for a population mean

c)A one-sample z-test for a population proportion

d)A two-sample t-test for a difference between means

e)A matched-pairs t-test for a mean difference

math   Statistics-And-Probability   
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Answer #1

From the past data, we don't have the information of population standard deviation and here only one sample is being compared.

Hence, A one-sample t-test for a population mean should be used

Option B

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