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KatRina [158]
3 years ago
5

The manager of an orchard expects about 70% of his apples to exceed the weight requirement for ""Grade A"" designation. At least

how many apples must he sample to be 90% confident of estimating the true proportion within ±4%? A) 19 B) 23 C) 89 D) 356 E) 505
Business
1 answer:
kenny6666 [7]3 years ago
6 0

Answer:

D) 356

Explanation:

ME = Z x √[(P x Q) / N]  

  • margin of error (ME) = 4%
  • 90% confidence level (Z) = 1.645 (by convention)
  • P = 70% of apples exceed Grade A
  • Q = 30% of apples do not exceed Grade A
  • N = sample size = ?  

0.04 = 1.645 x √[(0.7 x 0.3) / N]

0.04 = 1.645 x √(0.21 / N)

0.04 = 1.645 x 0.458 / √N

0.04 = 0.7538 / √N

√N = 0.7538 / 0.04 = 18.84

N = 18.84² = 355.2 ≈ 356 (there is no 0.2 apples, you must round up)

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