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Studentka2010 [4]
3 years ago
13

What is the answer and how is it the answer

Mathematics
1 answer:
zheka24 [161]3 years ago
7 0
The answer would be 28 and trust me
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Suppose that a random sample of 10 adults has a mean score of 62 on a standardized personality test, with a standard deviation o
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Answer:

The 90% confidence interval for the mean score of all takers of this test is between 59.92 and 64.08. The lower end is 59.92, and the upper end is 64.08.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.9}{2} = 0.05

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.05 = 0.95, so z = 1.645

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 1.645*\frac{4}{\sqrt{10}} = 2.08

The lower end of the interval is the sample mean subtracted by M. So it is 62 - 2.08 = 59.92

The upper end of the interval is the sample mean added to M. So it is 62 + 2.08 = 64.08.

The 90% confidence interval for the mean score of all takers of this test is between 59.92 and 64.08. The lower end is 59.92, and the upper end is 64.08.

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2 years ago
An expression 20x + 35y What is the greatest common factor
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Answer:

5

Step-by-step explanation:

20x   = 2  \times 2 \times 5 \times x\\ 35y = 5 \times 7 \times y

<em>G</em><em>CF</em><em> </em><em>=</em><em> </em><em>5</em>

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The length of a rectangle is twice its width.
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idc

Step-by-step explanation:

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If x+6 is an even integer, which one of the following must be an even integer?
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