Hat is the sum of the polynomials? (7x3 – 4x2) + (2x3 – 4x2)
1 answer:
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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