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3 years ago

Perform the indicated row operations: -10r2 r2 3r3 [2 -1 -4|7] [0 3 -2|5] [0 10 8|2]

Mathematics

1 answer:

n200080 [17]3 years ago

6 0

Answer:

Second one is -30, 20, -50

Third one is 30, 24, 6

Step-by-step explanation:

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3 years ago

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E.g.
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2 years ago

A random sample of 35 business students required an average of 50.7 minutes to complete a statistics exam. Assume that the popul

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Answer:

(47.3, 54.1)

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:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

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

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

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.

$M = 1.96\frac{10.4}{\sqrt{35}} = 3.4$

The lower end of the interval is the sample mean subtracted by M. So it is 50.7 - 3.4 = 47.3

The upper end of the interval is the sample mean added to M. So it is 50.7 + 3.4 = 54.1

The answer is (47.3, 54.1).

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2 years ago

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Answer:

77381 is your answer

Step-by-step explanation:

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2 years ago