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melamori03 [73]
3 years ago
9

A sociologist develops a test to measure attitudes about public transportation, and 27 randomly selected subjects are given the

test. Their mean score is 76.2 and their standard deviation is 21.4. Construct the 95% confidence interval for the standard deviation, σ, of the scores of all subjects.a. 17.5 < σ < 27.8b. 17.2 < σ < 27.2c. 285.61 < σ <858.49d. 16.6 < σ < 28.6e. 16.9 < σ < 29.3
Mathematics
1 answer:
Crazy boy [7]3 years ago
6 0

Answer: e. 16.9<\sigma<29.3

Step-by-step explanation:

As per given , we have

n= 27 , \overline{x}=76.2  , s=21.4

Critical value using Chi-square table:-

\chi^2_{\alpha/2, n-1}=\chi^2_{0.025, 26}=41.92317010\\\\ \chi^2_{1-\alpha/2, n-1}=\chi^2_{0.975, 26}=13.84390498

Confidence interval for standard deviation:

\sqrt{\dfrac{(n-1) s^2}{\chi^2_{\alpha/2, n-1}}}< \sigma

Hence, the 95% confidence interval for the standard deviation, σ, of the scores of all subjects : 16.9

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x-(x times 33%)  or x times (100-33)%

Step-by-step explanation:

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A pelican is flying 120 feet above sea level. The pelican dives to catch a fish that is 35 feet below sea level. Which number re
sergiy2304 [10]

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ABC ~ ADE AC = 4, AE = 7, AD = 10, what is the length of AB? 1 3/7 2 1/2 5 5/7 17 1/2
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If the polygon or the figures are similar then it is known that the ratios of their corresponding sides and angles are proportional. In this item we can derive an equation that is,

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3 0
3 years ago
Read 2 more answers
I need help, i have a quiz on it soon.
Nezavi [6.7K]

Answer:

okay

Step-by-step explanation:

complementary angles are angles that add up to 90 degrees

so what you would do is take each number that you have and subtract it from 90

In the first one you would

1. take 90-80

2. you get your answer of 10!

i hope this helps :)

8 0
3 years ago
a box contains 20 red, 10 blue and 30 yellow beads. what is the probability of a bead drawn at random being yellow or blue?​
dexar [7]

Answer:

2/3

Step-by-step explanation:

1. add all the beads up together:

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2. add the blue and yellow beads up:

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4. the final answer:

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5 0
3 years ago
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