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blsea [12.9K]
3 years ago
14

Mathias was asked whether the following equation is an identity:

Mathematics
2 answers:
aivan3 [116]3 years ago
5 0

Answer:

B

he is incorrect

kotegsom [21]3 years ago
4 0

Answer:

a is the answer

Step-by-step explanation:

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How would you show a of rate changeof 15 feet per second on a graph
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How many combinations of powerball numbers are there
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2 years ago
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Suppose we are interested in analyzing the weights of NFL players. We know that on average, NFL players weigh 247 pounds with a
Diano4ka-milaya [45]

Answer:

a) The standard error would be of 8.58 pounds.

b) The margin of error is 14.11 pounds.

c) The 90% confidence interval for the population mean is between 232.89 pounds and 261.11 pounds

Step-by-step explanation:

a.What is the standard error?

The standard error is

s = \frac{\sigma}{\sqrt{n}}

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

s = \frac{47}{\sqrt{30}} = 8.58

The standard error would be of 8.58 pounds.

b.What is the margin of error at 90% confidence?

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*s = 1.645*8.58 = 14.11

The margin of error is 14.11 pounds.

c. Using my sample of 30, what would be the 90% confidence interval for the population mean?

Lower bound: Sample mean subtracted by the margin of error.

247 - 14.11 = 232.89 pounds

Upper bound

247 + 14.11 = 261.11 pounds

The 90% confidence interval for the population mean is between 232.89 pounds and 261.11 pounds

4 0
3 years ago
School started at 9:15am. After two period lasting 50min each, children had a break. At what time was the break?
pogonyaev

Answer:

10:55

Step-by-step explanation:

9:15/10:05/10:55

6 0
2 years ago
Read 2 more answers
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