A fashion designer wants to know how many new dresses women buy each year. Assume a previous study found the standard deviation to be 1.8. She thinks the mean is 5.7 dresses per year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.12 at the 85% level of confidence? Round your answer up to the next integer.

The sample size 'n' = 242

Step-by-step explanation:

Step(i):-

Given mean of the sample = 5.7

Given standard deviation of the sample (σ)  = 1.8

The Margin of error  (M.E) = 0.12

Level of significance = 0.85 or 85%

Step(ii):-

The margin of error is determined by

The critical value Z₀.₁₅ = 1.036

Cross multiplication , we get

√n  =  15.54

Squaring on both sides, we get

n = 241.49≅ 241.5≅242

Conclusion:-

The sample size 'n' = 242

konichiwa~! my name is zalgo and i am here to answer your anime-related question today. more than likely, kirishima would kill izuku, marry mino and kiss momo. all of this would be my opinion by the way. (and i am also a weeb lol)

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first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation: