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Null hypothesis is written in negative form . 
ex: The sunlight does not affect the growth of the plant.
alternative hypothesis is written in affirmative form.
ex: the sunlight affects the growth of the plant.
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A common statistical method is to compare a population to the mean.

For example, you might have come up with a measurable hypothesis that children have a higher IQ if they eat oily fish for a period of time.

Your alternative hypothesis, H1 would be

“Children who eat oily fish for six months will show a higher IQ increase than children who have not.”

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