To use a t procedure, which of the following must be true?

i. the standard deviation of the parent population must be unknown.
ii. the sample size must be small (less than 30).
iii. the parent population must be normally distributed.

a) i only
b) i and iii only
c) iii only
d) ii and iii only
e) i, ii, iii

C. The parent population must be normally distributed

Step-by-step explanation:

The parent population must follow a normal distribution in order to use a t procedure

step-by-step explanation:

first anwser choice.

step-by-step explanation:

the greater/less or equal to symbol (> or < with the line at the bottom) is a closed/filled in circle.

-5c + 2 _< _27

subtract from both sides by 2

-5c _< _ 27

divide both sides by -5

c _< _ 5.4

flip the inequality sign

c _> _5.4

the only possible answer that would match the simplified inequality is the first answer choice