Question 13
From previous data, we know that the annual rainfall, X in a particular region is normally distributed with E(X) = 650 mm. In recent years, due to various climate changes, it is hypothesized that in fact, the annual rainfall has increased. Let us assume that the rainfall (in mm) registered in the past 8 years are as follows:
650, 802, 400, 550, 690, 700, 750, 690.
Based on the above data, answer the given subquestions.
Identify the null and alternative hypotheses: