12. which of the following are true? i. a null hypothesis is always stated in terms of a sample value. ii. random samples are only needed if the sample size is very small compared to the population. iii. a type i error can be made only if the null hypothesis is true.

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,