Help me pls i need help

Mathematics

2 answers:

Igoryamba3 years ago

6 0

Jack needs 72 feet of fencing.

You had to do 4 ft x 18 ft which would give you the answer of 72. To find the area of a rectangle you do length x width.

bekas [8.4K]3 years ago

5 0

He's going to put fence <em>around</em> the garden. This means that they question is asking for the perimeter (which is length + length + width + width) so the perimeter is 18 + 18 + 4 + 4, or 44ft of fencing

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The average annual premium for automobile insurance in the United States is $1411. A representative sample of annual premiums fo

Harrizon [31]

Using confidence interval concepts, it is found that:

a) The point estimate is the sample mean.

b) The confidence interval is: $\overline{x} \pm T\frac{s}{n}$

c) If $1411 is between the bounds of the interval yes, otherwise no.

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At item a, it asks to provide a point estimate for the population mean, which is the sample mean $\overline{x}$

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Item b:

In the spreadsheet, it is possible to find the <em>standard deviation for the sample</em>, thus, the t-distribution is used.
The confidence interval will be given by:

$\overline{x} \pm T\frac{s}{n}$

In which:

$\overline{x}$ is the sample mean.
T is the critical value, from the t-distribution, with a two-tailed area of $\frac{1 - 0.95}{2} = 0.025$ and n-1 degrees of freedom.
s is the standard deviation for the sample.
n is the sample size.