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
4 x > − 16 (Possibility 1)
4 x
4 > − 16
4 (Divide both sides by 4)
x > − 4
6 x ≤ − 48 (Possibility 2)
6 x
6 ≤ − 48
6 (Divide both sides by 6)
x ≤ − 8
Answer:
x > − 4 or x ≤ − 8
60 and (a) are the factors
24 x 1/2 = 12,
use these numbers to make a problem