Mathematics: A market surveyor wishes to know how many energy drinks teenagers drink each week. They want to construct a 80%80% confidence interval with an error of no more than 0.070.07. A consultant has informed them that a previous study found the mean to be 3.63.6 energy drinks per week and found the variance to be 1.441.44. What is the minimum sample size required to create the specified confidence interval? Round your answer up to the next integer.

A market surveyor wishes to know how many energy

karen4764

25.01.2022

481

Step-by-step explanation:

Given:

Variance = 1.44

S.d = √1.44 = 1.2

C.I = 80%

Margin of error, E = 0.07

Mean = 3.6

Using Z table, the Z score for 80% confidence interval, Zc = 1.28

To find the sample size, n, we have:

$n= [\frac{Z_c * s.d}{E}]^2$

Substituting figures in the formula, we have:

$n = [\frac{1.28 * 1.2}{0.07}]^2$

n = 21.94286²

n = 481.49

Approximately, n = 481

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orangeicecream

10.10.2021

aA F are the only ones yes

Step-by-step explanation: draw a vertical line if it touches more than once it's not a function

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