Isn’t it 48? Im not sure if it is
Answer:
Step-by-step explanation:
From the information given :
The null hypothesis
The alternative hypothesis
Given that:
the sample size n = 21
sample standard deviation s = 68
population standard deviation σ = 60
a) The level of significance
b) The chi-square statistics can be calculated as:
The degree of freedom is :
= n - 1
= 21 - 1
= 20
5+4=9
9+4=13
13+4=19
Answers is 4