Medicine College

A scientist has developed a new medication to reduce the number of headaches people have (l point) each month. She runs a study with 90 patients and records the number of headaches they have per month before starting the medication, and then records the number of headaches they have per month eight weeks after starting the medication. She wants to prove that her medication reduces the frequency of headaches. Which of the following describes the scientist's null and alternative hypotheses? ○ null hypothesis: -約= 0 , alternative hypothesis: 서-約< 0 Onull hypothesis: A4-内< O, alternative hypothesis: 서-서 > 0 Onull hypothesis: p 0, alternative hypothesis: 0 Onull hypothesis: p <0, alternative hypothesis: -0

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Answer 1

Null hypothesis: there is no significant difference in the number of headaches people have per month before and after taking the medication ( = 0). Alternative hypothesis: the medication reduces the number of headaches people have per month (0).

This means that the scientist is testing whether her medication has a significant effect on reducing the frequency of headaches, with the null hypothesis stating that there is no effect and the alternative hypothesis stating that there is a significant effect. The use of the term "" refers to the population mean of headache frequency.

This is because it explains the reasoning behind the null and alternative hypotheses as well as the meaning of the symbols used in the hypotheses.

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