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2 years ago

What's the expanded form to write 16,107,320

Mathematics

1 answer:

Romashka [77]2 years ago

6 0

(10,000,000) + (6,000,000) + (100,000) + (7,000) + (300) + (20)

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Simplify the expression<br><br> -4+11

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Answer:

Step-by-step explanation:

-4 +11 is saying that assuming if a person owe 4 dollars and his friend gives him 11 dollars that he will pay back the four dollars and still have 7 dollars left

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3 years ago

Trevor deposits $1500 in a simple interest account that pays 4.3% annually. After 15 years, how much total money would be in the

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$2467.50 would be in the account after 15 years.

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2 years ago

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5. Show 3 different ways on how you can multiply two polynomials to get 30x^3.

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10x(3x^2)
15x^2(2x)
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3 years ago

Suppose a baker claims that the average bread height is more than 15cm. Several of this customers do not believe him. To persuad

laila [671]

Answer:

$17-2.262\frac{1.9}{\sqrt{10}}=15.641$

$17+2.262\frac{1.9}{\sqrt{10}}=18.359$

So on this case the 95% confidence interval would be given by (15.641;18.359)

And since the lower limit for the confidence interval is higher than 15 we can conclude that at 5% of significance the true mean is higher than 15 cm

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".

$\bar X=17$ represent the sample mean

$\mu$ population mean (variable of interest)

s=1.9 represent the sample standard deviation

n=10 represent the sample size

Confidence interval

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

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

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=10-1=9$

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,9)".And we see that $t_{\alpha/2}=2.262$