Question

Question 1

In a chi -square test of independence , the null hypothesis states that-----------.

a. the two variables of interest are related in the population.

b. the column frequencies equal the row frequencies

c. the sum of the and the column frequencies equal the total frequency

d. the two variables of interest are unrelated in the population

Question 2

A survey asked people whether they identified as a morning person, night person, or had no preference.

a. 270 replied Morning Person

b. 240 replied Night Person

c. 90 replied No Preference

If your expectation would have been an equal distribution across the 3 categories. What is the observed chi-square value?

a. 200

b.117

c. 93

d. 600

Question 3

Generally speaking, if the observed and expected results are not totally identical, the null hypothesis should be-------------.

a. rejected only if the difference cannot likely attributed to the sampling error

b. rejected

c. accepted only if the experiment is repeated

d. accepted

Answer 1

Answer - 1:

In a chi -square test of independence , the null hypothesis states that-----------.

d. the two variables of interest are unrelated in the population

Answer - 2: Observed value = 93

Option C is correct.

Answer - 3: Generally speaking, if the observed and expected results are not totally identical, the null hypothesis should be-------------.

a. rejected only if the difference cannot likely attributed to the sampling error