The average yearly rainfall in the sahara desert used to be 10 inches. a climatologist believes that amount has changed. which represent the null and alternative hypothesis?

A null hypothesis states that the population parameter should be equal to the value that was hypothesized. So in this case the null hypothesis (H₀) would be equal (=) to 10. 

H₀=10

This indicates that there was no change. 

An alternative hypothesis, on the other hand, would indicate that there is a change. So the alternative hypothesis(Ha) should either be greater, smaller or in short, not equal to the hypothesized value. 

Ha is not equal to 10

This would indicate there was a change. 

Step-by-step explanation:

A null hypothesis is a hypothesis which a researcher mostly try to disprove, it says that there is no statistically significant relationship between the two variables. An alternative hypothesis says that there is a statistical significance  between two variables.

Given: The average yearly rainfall in the Sahara desert used to be 10 inches.

A climatologist believes that amount has changed.

Thus, the null hypothesis for the given situation will be :

The alternative hypothesis for the given situation will be :

No a triangle cannot be formed because when you add the two smallest number together (which would be 11) the have to be bigger than the number it is "against" ( which would be 12)

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