Answer: 112
Step-by-step explanation:
Given : Significance level : 
Critical value: 
Margin of error : E = 9%=0.09
The estimated proportion of caret : p =0.38
Now, the formula to find the sample size :-

i.e. 

Hence, the required minimum sample size = 112
Answer:
288
Step-by-step explanation:
Answer:
d. 6
Step-by-step explanation:
Answer:
Minimum: 72 Maximum: 88
Step-by-step explanation:
The common factors for 28 and 42 are 1, 2, 7 and 14.