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3 years ago

Square root of 3_2/3

2 answers:

7 0

<span>If its the square root of 3 and 2/3 the answer is
1.91485421551
but if your rounding it on a test/worksheet look for 1.9 or 2.0</span>

Charra [1.4K]3 years ago

7 0

The answer ( rounded off ) would be 1.9 or 2.0

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Summerfield is 6 miles due north of the airport, and Castroville is 8 miles due east of the airport. How far apart are Summerfie

AVprozaik [17]

Answer:

10 miles

Step-by-step explanation:

Right triangle

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3 years ago

Find the value of x in the parallelogram below

bearhunter [10]

Answer:

x=18

Step-by-step explanation:

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2 years ago

A market surveyor wishes to know how many energy drinks teenagers drink each week. They want to construct a 85% confidence inter

Gre4nikov [31]

Answer:

$7.3-1.440\frac{1.2}{\sqrt{830}}=7.240$

$7.3+1.440\frac{1.2}{\sqrt{830}}=7.360$

So on this case the 85% confidence interval would be given by (7.2;7.4)

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".

$\bar X=7.3$ represent the sample mean

$\mu$ population mean (variable of interest)

$\sigma =1.2$ represent the population standard deviation

n=830 represent the sample size

Solution to the problem

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

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

Since the Confidence is 0.85 or 85%, the value of $\alpha=0.15$ and $\alpha/2 =0.075$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.075,0,1)".And we see that $z_{\alpha/2}=1.440$