(7) Hypothesis testing - Short answer and fill in the blanks. (a) In the final step of a hypothesis test, under the assumption of the null hypothesis the random sample is either Unusual or it is (b) In conclusion to a hypothesis test, the null hypothesis is either or it is (c) Statisticians use He to represent the null hypothesis while HI represents the alternative hypothesis, Briefly state the definition of null hypothesis. (d) A normal curve is the model used by statisticians to make predictions about a population having a bell-shaped distribution. After shading under the normal curve, the total Area = . That's because for any probability distribution, total Probabilities =