Answer:
Step-by-step explanation:
As with multiplying any rational expressions, the numerator of the result is the product of the numerators, and the denominator of the result is the product of the denominators.
_____
The denominator product is found using the distributive property. Each of the terms of one factor is multiplied by the other factor.
Answer:
b) 74
The sample size that needs to be taken if the desired margin of error is 5 or less is 74
Step-by-step explanation:
<u>Explanation:</u>-
Given population variance σ² = 484
σ = √484
σ = 22
The level of significance ∝=0.95
The z-score of 0.95 level of significance = 1.96
Given Margin of error = 5
we know that the margin of error is determined by
cross multiplication, we get
Squaring on both sides, we get
n = (8.624) ²
n = 74.37 ≅74
<u>Conclusion</u>:-
The sample size that needs to be taken if the desired margin of error is 5 or less is 74
