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4 years ago

89,999 rounded to the nearest hundred thousand

Mathematics

2 answers:

lys-0071 [83]4 years ago

7 0

The answer is 90,000

tia_tia [17]4 years ago

3 0

90,000, because you would look at the ten thousands. The number there is a 9 so you would round up to 90,000.

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3 years ago

A 95 percent confidence interval for the mean of a population is to be constructedand must be accurate within 0.3 unit. A prelim

jarptica [38.1K]

Answer:

B. 359

Step-by-step explanation:

Given that:

The margin of error (e) must be within 0.3 unit, The standard deviation (σ) = 2.9 and the the confidence level = 95% = 0.95

α = 1 =0.95 = 0.05

$\frac{\alpha}{2}=\frac{0.05}{2}=0.025$

The z score of 0.025 corresponds to the z score of 0.0475 (0.5 - 0.025) which can be gotten from the normal probability table.

Therefore: $z_\frac{\alpha}{2}= z_{0.025}=1.96$

The formula for the margin of error is given by:

$e=z_{0.025}\frac{\sigma}{\sqrt{n} } \\Substituting:\\0.3=1.96*\frac{2.9}{\sqrt{n} } \\\sqrt{n}=\frac{1.96*2.9}{0.3}\\\sqrt{n} =18.95\\ n=18.95^2=359$

Therefore the smallest sample size (n) is 359

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3 years ago

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kotegsom [21]

Hey. Good afternoon.

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3 years ago

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3 years ago

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3 years ago

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