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Mama L [17]
2 years ago
12

Find the reciprocal of - 1 1/17

Mathematics
2 answers:
zvonat [6]2 years ago
8 0

Answer:

- \frac{17}{18}

Step-by-step explanation:

The reciprocal of a number n is \frac{1}{n}

Given

- 1 \frac{1}{17} ( change to an improper fraction )

= - \frac{18}{17} , then reciprocal is

\frac{1}{-\frac{18}{17} } = - \frac{17}{18}

horsena [70]2 years ago
7 0
The reciprocal is 17/-11

Crown please
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According to the U.S. Census Bureau, 11% of children in the United States lived with at least one grandparent in 2009 (USA TODAY
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Answer:

The pvalue of the test is 0.0001 < 0.02, which means that we reject the null hypothesis and accept the alternate hypohteis that the proportion of all children in the United States who currently live with at least one grandparent is higher than 11%.

Step-by-step explanation:

Proportion of all children in the United States who currently live with at least one grandparent is higher than 11%

This means that the null hypothesis is:

H_0: p = 0.11

And the alternate hypothesis is:

H_a: p > 0.11

The test statistic is:

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

In which X is the sample mean, \mu is the value tested at the null hypothesis, \sigma is the standard deviation and n is the size of the sample.

0.11 is tested at the null hypothesis:

This means that \mu = 0.11, \sigma = \sqrt{0.11*0.89}

Suppose that in a recent sample of 1550 children, 214 were found to be living with at least one grandparent.

This means that:

n = 1550, X = \frac{214}{1550} = 0.1381

Value of the test statistic:

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

z = \frac{0.1381 - 0.11}{\frac{\sqrt{0.11*0.89}}{\sqrt{1550}}}

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Pvalue of the test and decision:

This is the probability of finding a sample proportion above 0.1381, which is 1 subtracted by the pvalue of Z = 3.54.

z = 3.54 has a pvalue of 0.9999

1 - 0.9999 = 0.0001

The pvalue of the test is 0.0001 < 0.02, which means that we reject the null hypothesis and accept the alternate hypohteis that the proportion of all children in the United States who currently live with at least one grandparent is higher than 11%.

8 0
2 years ago
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