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1 year ago

9

Selina and three of her classmates each wrote out the steps for finding an approximate percent change. They all agreed on the fi

rst and fourth step:
1. Find the positive difference between the original number and the new number.
2. ________________________
3. ________________________
4. Round the answer if necessary.

They did not agree on steps 2 and 3. Which instructions are correct for steps 2 and 3?

2 answers:

Naddik [55]1 year ago

5 0

Answer: 2. Divide the difference by the original number.

3. Multiply it by 100.

Step-by-step explanation:

Since when we find the percentage change in a number then we follow the following steps,

1. find the difference between the new number and the original number.

2. divide the difference by the original number.

3. Multiply it by 100.

4.Round the answer if necessary.

We can understand it with help of the below example.

If a number 25 changes to 75.

Then the percentage change in 25 = $\frac{75-25}{25} \times 100=\frac{50}{25}\times 100$ = 200%

kotegsom [21]1 year ago

3 0

Step 2 is divide the difference between the original number and the new number by the original number. you will get a decimal.

step 3 convert what you got from step 2 to a percent by multiplying it by 100 and adding %

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Step-by-step explanation:

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The first standard deviation is $\sigma_1 = 29.0$

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The alternative hypothesis is $H_a : \mu _1 - \mu_2 \ne 0$

Generally the test statistics is mathematically represented as

$t = \frac{\= x_1 - \= x_2}{ \sqrt{\frac{\sigma_1^2}{n_1} +\frac{\sigma_2^2}{n_2} }}$

$t = \frac{0.98125 - 1.6531}{ \sqrt{\frac{30^2}{32} +\frac{29^2}{32} }}$

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Generally the degree of freedom is mathematically represented as

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The significance $\alpha$ is evaluated as

$\alpha = (C - 100 )\%$

=> $\alpha = (95 - 100 )\%$

=> $\alpha =0.05$

The critical value is evaluated as

$t_c = 2 * t_{0.05 , 62}$

From the student t- distribution table

$t_{0.05, 62} = 1.67$

So

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