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gladu [14]
3 years ago
12

Help please (1 3/4 - 1/8) + (5/6+ 2/3)

Mathematics
1 answer:
MA_775_DIABLO [31]3 years ago
6 0
Exact form : 25/8
decimal form: 3.125
mixed number form: 3 1/8
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A particular psychological test is used to measure need for achievement. The average test score for all university students in O
Angelina_Jolie [31]

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Only B and C are always true.

Step-by-step explanation:

To analyse which statements are always true, we go through the process of finding confidence intervals for sample means, from the start.

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After obtaining the critical value, we then obtain the standard deviation of the distribution of sample means or simply the standard error of the mean. This is given as

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where σ = standard deviation; which isn't given. The standard deviation might be high enough to guarantee that the Margin of error is high too for the confidence interval to contain 115 or low enough to ensure that the Margin of error is very small and the confidence interval will not contain 115.

Or the sample size might be high enough to make the standard error of the mean to be eventually small and lead to a small margin of error and the condidence interval will not contain 115.

The point is, it isn't always sure that the resulting interval.would contain 115. So, statement A isn't always true.

Then from σₓ = σ/√n,

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The 95% confidence interval for n = 100 will be more narrow than the 95% confidence interval for n = 50.

Hence, Only B and C are always true.

Hope this Helps!!!

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3 years ago
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