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2 years ago

9

Please please help need done will mark brainly

2 answers:

Katen [24]2 years ago

5 0

A. 1/3
B. 3/5
C. 1 1/2

Pani-rosa [81]2 years ago

3 0

Answer:

A. 0.33

B.0.6

C.1.5

these are the answers

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Answer:

$L = 3.975$

Step-by-step explanation:

Given

See comment for data

Required

The lower limit 94% confidence interval

First, calculate the mean

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Next, calculate the standard deviation using:

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So, we have:

$\sigma = \sqrt{\frac{(0.9 - 6.175)^2 +(10- 6.175)^2 +.................+(8.9- 6.175)^2 +(4.6- 6.175)^2}{12}}$

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$\sigma = \sqrt{16.4385416667}$

$\sigma = 4.054$

For 94% interval, the z score is

$z = 1.88$

So, the margin of error (E) is:

$E = z * \frac{\sigma}{\sqrt n}$

$E = 1.88 * \frac{4.054}{\sqrt {12}}$

$E = 1.88 * \frac{4.054}{3.464}$

$E = 2.200$

The confidence interval of the true mean is:

$CI = (\bar x \± E)$

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$L = \bar x -E$

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and the upper limit (U) is

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Answer:

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