Question

QUESTION 5 A sample of 200 people is classified by whether or not they are smokers (yes/no) and whether or not they have hypertension (yes/no). The sample consists of 120 smokers, of whom 50 have hypertension, and 80 non-smokers, of whom 10 have hypertension. A chi-square test is used to test whether there is difference in hypertension between smokers and non-smokers. What is the value of the chi-square test? 01.19.4 O2.25.6 O3.32.8 04.28.9

Answer 1

Answer

According to question, we have the following data table

	Smoker	no smoker
Hypertension	50	10
No hypertension	70	70
Total	120	80

Using TI 84 calculator

press 2nd then Matrix and enter the data in matrix A

Again

press STAT then TESTS then select  

X2 test

select matrix A as observed values

matrix B as expected values

press ENTER

we get

$\chi^2$ = 19.44

therefore, option 1 is correct