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cluponka [151]
3 years ago
12

5x=-4y+4;x= 1,2,3 solve equation then find value of y

Mathematics
2 answers:
nadezda [96]3 years ago
7 0

x = 1 5(1)= -4y + 4 5= -4y + 4 -4.        -4  1 = -4y   y = -¼   x = 2...   10 = -4y + 4  6 = -4y  y = -3/2   x = 3..   15 = -4y + 4  11 = -4y  y = -11/4

Alex Ar [27]3 years ago
7 0

x = 1: 5 = -4y + 4  1 = -4y  y = -¼   x = 2:  10 = -4y + 4  6 = -4y  y = -3/2   x = 3:  15 = -4y + 4  11 = -4y  y = -11/4  Hopefully that helps you ❤

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Answer: A

Step-by-step explanation:  SORRY IF I GET IT WRONG

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Using the z-distribution, it is found that since the <u>test statistic is greater than the critical value</u>, it can be concluded that the mean length of jail time has increased.

At the null hypothesis, it is <u>tested if the mean length of jail time is still of 2.5 years</u>, that is:

H_0: \mu = 2.5

At the alternative hypothesis, it is <u>tested if it has increased</u>, that is:

H_1: \mu > 2.5

We have the <u>standard deviation for the population</u>, thus, the z-distribution is used. The test statistic is given by:

z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}

The parameters are:

  • \overline{x} is the sample mean.
  • \mu is the value tested at the null hypothesis.
  • \sigma is the standard deviation of the sample.
  • n is the sample size.

For this problem, the values of the <u>parameters</u> are: \overline{x} = 3, \mu = 2.5, \sigma = 1.5, n = 26

Hence, the value of the <u>test statistic</u> is:

z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}

z = \frac{3 - 2.5}{\frac{1.5}{\sqrt{26}}}

z = 1.7

The critical value for a <u>right-tailed test</u>, as we are testing if the mean is greater than a value, with a <u>significance level of 0.05</u>, is of z^{\ast} = 1.645

Since the <u>test statistic is greater than the critical value</u>, it can be concluded that the mean length of jail time has increased.

A similar problem is given at brainly.com/question/24166849

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