DA0-001 · Question #137
The sales of a grocery store had an average of $8,000 per day. The store introduced several advertising campaigns in order to increase sales. To determine whether the advertising campaigns have been…
The correct answer is D. Null: Population mean is 8,000; Alternative: Population mean is greater than 8,000. To test if advertising campaigns significantly increased sales, the null hypothesis states no change in the population mean, while the alternative hypothesis states an increase in the population mean.
Question
The sales of a grocery store had an average of $8,000 per day. The store introduced several advertising campaigns in order to increase sales. To determine whether the advertising campaigns have been effective in increasing sales, a sample of 64 days of sales was selected, and the sample mean was $8,300 per day. The correct null and alternative hypotheses to test whether there has been a significant increase are:
Options
- ANull: Sample mean is 8,000; Alternative: Sample mean is greater than or equal to 8,000.
- BNull: Sample mean is 8,000; Alternative: Sample mean is greater than 8,000.
- CNull: Population mean is 8,000; Alternative: Population mean is greater than or equal to 8,000.
- DNull: Population mean is 8,000; Alternative: Population mean is greater than 8,000.
How the community answered
(56 responses)- A4% (2)
- B7% (4)
- C11% (6)
- D79% (44)
Why each option
To test if advertising campaigns significantly increased sales, the null hypothesis states no change in the population mean, while the alternative hypothesis states an increase in the population mean.
Hypotheses are formulated about population parameters, not sample statistics. Also, the alternative hypothesis should not include an equality sign.
Hypotheses are formulated about population parameters, not sample statistics.
The alternative hypothesis should express a specific directional change (e.g., greater than), and equality is reserved for the null hypothesis.
The null hypothesis (H0) always asserts no effect or no difference and includes equality, stating the population mean sales (μ) is $8,000. The alternative hypothesis (Ha) reflects the claim of an increase, thus stating the population mean sales (μ) is greater than $8,000.
Concept tested: Formulating null and alternative hypotheses
Source: https://learn.microsoft.com/en-us/power-bi/transform-model/data-modeling-calculations-hypothesis-testing
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