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3 years ago

14

Help omg!! fill in the blank with the correct response. 6C2

2 answers:

Yanka [14]3 years ago

6 0

Answer:

15

Step-by-step explanation:

15 is the total number of all possible combinations for choosing 2 elements at a time from 6 distinct elements without considering the order of elements in statistics & probability surveys or experiments.

Alenkinab [10]3 years ago

3 0

15 Yep yep looks about right

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Answer:

7) d)

standard error of the mean of one sample of 'n' observation = 0.20

8) a)

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9) d

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Step-by-step explanation:

7)

solution:-

The Given data sample size 'n' = 81

Given Population standard deviation 'σ' = 1.8 hours

The standard error of the mean of one sample of 'n' observation is

Standard error (SE)

= $\frac{S.D}{\sqrt{n} }$

= σ / √n

= $\frac{1.8}{\sqrt{81} } =0.2$

standard error of the mean of one sample of 'n' observation = 0.20

8)

Solution:-

The Given data sample size 'n' = 81

Given Population standard deviation 'σ' = 1.8 hours

Given the probability is 0.95

The z- score = 1.96 at 0.05 level of significance.

The margin of Error = $\frac{z_{0.95} S.D}{\sqrt{n} }$

= $\frac{1.96 (S.D)}{\sqrt{n} }$

= $\frac{1.96 (1.8)}{\sqrt{81} }$

= 0.392

The margin of Error = 0.392

9)

Solution:-

<u>The 95% of confidence intervals are </u>

<u></u> $(x^{-} - 1.96\frac{S.D}{\sqrt{n} } , x^{-} + 1.96\frac{S.D}{\sqrt{n} } )$ <u></u>

<u></u> $(9 - 1.96\frac{1.8}{\sqrt{81} } , 9+ 1.96\frac{1.8}{\sqrt{81} } )$ <u></u>

(9 - 0.392 , (9 + 0.392)

(8.609 , 9.392)

<u>The 95% of confidence intervals are </u>(8.61 , 9.39)

4 0

3 years ago