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Sagot :
(a) The required sample size is 1.96.
(b) Sample size = n = 89
(c) Sample size = n = 62
What is standard deviation?
The standard deviation in statistics is a measurement of how much a set of values can vary or be dispersed. A low standard deviation suggests that values are typically close to the set's mean, whereas a high standard deviation suggests that values are dispersed over a wider range.
(a) Population standard deviation = σ = 3
Margin of error = E = 0.253
At 95% confidence level the z is,
α = 1 - 95%
α = 1 - 0.95 = 0.05
α/2 = 0.025
Zα/2 = 1.96
sample size = n = [Zα/2* σ / E]^2
n = [1.96 * 3 / 0.253]2
n = 540.14
Sample size = n = 541
b) Population standard deviation = σ = 24
Margin of error = E = 5
sample size = n = [Zα/2* σ/ E] 2
n = [1.96 * 24 / 5]2
n = 88.51
Sample size = n = 89
c) Population standard deviation = σ = 8
Margin of error = E = 2
sample size = n = [Zα/2* σ / E] 2
n = [1.96 * 8 / 2]2
n = 61.46
Sample size = n = 62
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