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2 years ago

Can someone help me? (2x+8)-(2x+16)

Mathematics

2 answers:

a_sh-v [17]2 years ago

8 0

Answer:

-8

Step-by-step explanation:

White raven [17]2 years ago

7 0

Answer:

-8

Step-by-step explanation:

(2x+8)-(2x+16)

Distribute the minus sign

(2x+8)-2x-16

Combine like terms

2x-2x +8-16

0x -8

-8

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2 years ago

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3 years ago

Data is collected to compare two different types of batteries. We measure the time to failure of 12 batteries of each type. Batt

-Dominant- [34]

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At the null hypothesis, it is tested if it does not outlast by more than 2 hours, that is, the subtraction is not more than 2:

$H_0: \mu_B - mu_A \leq 2$

At the alternative hypothesis, it is tested if it outlasts by more than 2 hours, that is:

$H_1: \mu_B - \mu_A > 2$

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The standard deviations for the samples are $s_A = s_B = 0.67$

Hence, the standard errors are:

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The distribution of the difference has mean and standard deviation given by:

$\overline{x} = \mu_B - \mu_A = 11.23 - 8.65 = 2.58$

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The test statistic is given by:

$t = \frac{\overline{x} - \mu}{s}$

In which $\mu = 2$ is the value tested at the hypothesis.

Hence:

$t = \frac{\overline{x} - \mu}{s}$

$t = \frac{2.58 - 2}{0.2735}$

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Since the test statistic is greater than the critical value for the right-tailed test, it is found that there is enough evidence to conclude that Battery B outlasts Battery A by more than 2 hours.

A similar problem is given at brainly.com/question/13873630

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2 years ago