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g100num [7]
3 years ago
7

Someone plz help (20 points)

Mathematics
1 answer:
lbvjy [14]3 years ago
4 0

Answer:

The answer is A

Step-by-step explanation:


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What is the answer to this
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Step-by-step explanation:

Mean = 81740

Standard deviation = 4590

Sample size = 15

Alpha level = 1-0.95 = 0.05

Df = 15-1 = 14

Critical value:

alpha/2 = 0.05/2 = 0.05

t0.025

t critical value = 2.145

Margin of error ME

2.145 x 4590/√15

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ME = 2542.09

Confidence interval

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= 81740-2542.09

= 79197.91

Upper CI = mean + ME

= 81740+2542.09

= 84282.09

[ 79197.91, 84282.09]

B.

Using excel, exact answer for CI

Lower limit = 79198.142724212173

Upper limit = 84281.8572757827

C.

The assumptions to be made from the population are that

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Answer:

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Step-by-step explanation:

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Answer:

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