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ladessa [460]
2 years ago
13

Y+7=19y -3 ayuda .prometo dar mucho amor

Mathematics
1 answer:
Vladimir79 [104]2 years ago
6 0

Answer:

y = 0.55 or 5 / 9

Step-by-step explanation:

here's the solution :-

=》y + 7 = 19y - 3

=》7 + 3 = 19y - y

=》18y = 10

=》y = 10 ÷ 18

=》y = 5 ÷ 9

=》y = 0.55

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A random survey of 1000 students nationwide showed a mean ACT score of 21.1. Ohio was not used. A survey of 500 randomly selecte
vodka [1.7K]

Answer:

We conclude that the mean Ohio score is below the national average.

Step-by-step explanation:

We are given that a random survey of 1000 students nationwide showed a mean ACT score of 21.1. Ohio was not used.

A survey of 500 randomly selected Ohio scores showed a mean of 20.8. The population standard deviation is 3.

<u><em>Let </em></u>\mu<u><em> = mean Ohio scores.</em></u>

So, Null Hypothesis, H_0 : \mu \geq 21.1      {means that the mean Ohio score is above or equal the national average}

Alternate Hypothesis, H_A : \mu < 21.1      {means that the mean Ohio score is below the national average}

The test statistics that would be used here <u>One-sample z test statistics</u> as we know about population standard deviation;

                    T.S. =  \frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n}}}  ~ N(0,1)

where, \bar X = sample mean Ohio score = 20.8

            \sigma = population standard deviation = 3

            n = sample of Ohio = 500

So, <u><em>test statistics</em></u>  =  \frac{20.8-21.1}{\frac{3}{\sqrt{500}}}  

                              =  -2.24

The value of z test statistics is -2.24.

<em>Now, at 0.1 significance level the z table gives critical value of -1.2816 for left-tailed test.</em><em> Since our test statistics is less than the critical values of z as -2.24 < 1.2816, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which </em><em><u>we reject our null hypothesis</u></em><em>.</em>

Therefore, we conclude that the mean Ohio score is below the national average.

4 0
3 years ago
Help asap pls!!!! i need the questions answered also !!
Vikki [24]

Answer:

it wold be A

Step-by-step explanation:

5 0
3 years ago
What is the value of x?<br> Enter your answer in the box.
slava [35]

Answer: Where is the picture?

Step-by-step explanation:

4 0
3 years ago
Forty is 40% less than what number
kirza4 [7]

40 = n-.40n

40 =n(1-.4)

40 = n(.6

divide by .6 on each side

40/.6 =n

n=66 2/3



5 0
3 years ago
Please help with this question
Nadya [2.5K]

<em>Answer</em><em>:</em>

<h2><em>w</em><em>+</em><em>x</em><em>=</em><em>y+</em><em>z</em></h2>

<em>Solution</em><em>,</em>

<em><</em><em>w=</em><em><</em><em>z(</em><em> </em><em>alternate</em><em> </em><em>angles)</em>

<em><</em><em>X=</em><em><</em><em>y(</em><em> </em><em>alternate</em><em> </em><em>angles)</em>

<em>w+</em><em>x</em><em>=</em><em>y+</em><em>z</em>

<em>Hope </em><em>this </em><em>helps.</em><em>.</em>

<em>Good </em><em>luck</em><em> on</em><em> your</em><em> assignment</em><em>.</em><em>.</em><em>.</em>

5 0
3 years ago
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