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Brums [2.3K]
2 years ago
15

I need help with this

Mathematics
1 answer:
LiRa [457]2 years ago
7 0

Answer:

X represents The value of players on the field

Step-by-step explanation:

the numbers 0-11 are showing how many people would be on the field should an official game be played

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The level of dissolved oxygen (DO) in a stream or river is an important indicator of the water's ability to support aquatic life
kaheart [24]

Answer:

a) It is most appropiate to apply t procedures with this sample because the population standard deviation is unknown. We have to estimate it from the sample standard deviation.

b) There is no enough evidence to claim that disolved oxygen level is below 5 mg/l.

c) As the null hypothesis was not rejected, the only error we could have made is a Type II error.

This Type II error is made when fail to reject the null hypotesis even when the alternative hypothesis is true.

In this context, it would mean that the aquatic life is really at risk (dissolved oxygen levels below 5 mg/l), but because the sample results combined with its size were not giving enough evidence to prove the claim.

Step-by-step explanation:

b) We have to perform a hypothesis test on the mean, at a significance level of 0.05.

The null and alternative hypothesis are:

H_0:\mu\geq 5\\\\H_a: \mu

The sample mean is 4.77 and the sample standard deviation is 0.94.

The sample size is 15, so the degrees of freedom are:

df=n-1=15-1=14

The t-statistic is:

t=\frac{\bar x-\mu}{s/\sqrt{n}} =\frac{4.77-5}{0.94/\sqrt{15}}= \frac{-0.23}{0.242}=-0.95

For a t=0.95 and df=14, the P-value is P=0.18.

This P-value is bigger than the significance level, so the null hypothesis is failed to be rejected.

There is no enough evidence to claim that disolved oxygen level is below 5 mg/l.

6 0
3 years ago
Solve (x - 2 < 5) ∩ (x + 7 > 6).
Scrat [10]

Answer:

-1<x<7

Step-by-step explanation:

We need to solve each inequality and then from the interval of numbers they both have in common (doing this because of the 'and').

x-2<5

Add 2 on both sides:

x<5+2

Simplify:

x<7

These are values of x that are less than 7.

x+7>6

Subtract 7 on both sides:

x>6-7

Simplify:

x>-1

These are values of x greater than -1.

So the values they have in common are the numbers in between -1 and 7.

That is x<7 and x>-1.

You can also write it as -1<x<7.

Maybe you need a graph to convince you more.

○~~~~~~~~~~~~~~~~~~~~~~~~~~~

~~~~~~~~~~~~~~~~~~~~~~~~~○

‐-------------(-1)------------------------(7)-----------------

So where you see both graphs is the solution:

○~~~~~~~~~~~~~~○

‐-------------(-1)------------------------(7)-----------------

3 0
3 years ago
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Write fifty-seven and one hundred forty-two thousandths in standard form.
Vedmedyk [2.9K]
57,142 because it says standard
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If perimeter of a rectangle is 48 cm.what is the area
anzhelika [568]
48 divide by 4 sides = 12
12 x 12 = 144cm squared
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Harlamova29_29 [7]

15 miles is the answer

8 0
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