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3 years ago

I need number 4. my math class is in an hour, can someone help me by then??

Mathematics

2 answers:

MrMuchimi3 years ago

8 0

Answer: the line would start at the 4 and for every half hour you go up by 2 on the Y and for every hour you go up by 4 on the Y

So by hour 3 you should be at 16

Lunna [17]3 years ago

4 0

the picture below is what your graph should look like.

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Which expressions are equivalent to the one below?

den301095 [7]

The expressions that show different ways to rewrite
$\dfrac{16^{x}}{4^{x}}$

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a. (4^x * 4^x) / 4^x
b. 4^x
c. (16 / 4)^x

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3 years ago

What's the square root of 34 rounded to the nearest tenth?

OverLord2011 [107]

The answer is 5.8

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4 years ago

Read 2 more answers

The National Institute of Standards and Technology (NIST) supplies "standard materials" whose physical properties are supposed t

Lady bird [3.3K]

Answer:

$10.08-1.64\frac{0.1}{\sqrt{6}}=10.013$

$10.08+1.64\frac{0.1}{\sqrt{6}}=10.147$

So on this case the 90% confidence interval would be given by (10.013;10.147)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma =0.1$ represent the population standard deviation

n represent the sample size

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

In order to calculate the mean and the sample deviation we can use the following formulas:

$\bar X= \sum_{i=1}^n \frac{x_i}{n}$ (2)

$s=\sqrt{\frac{\sum_{i=1}^n (x_i-\bar X)}{n-1}}$ (3)

The mean calculated for this case is $\bar X=10.08$

Since the Confidence is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , and we can use excel, a calculator or a tabel to find the critical value. The excel command would be: "=-NORM.INV(0.05,0,1)".And we see that $z_{\alpha/2}=1.64$