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Varvara68 [4.7K]

3 years ago

15

At the hardware store, you purchased a box of nails for 17 dollar. You had a coupon that took off 20% from the nails. Sales tax

is 6%. What is the total cost for the nails. Must show work

2 answers:

Vikentia [17]3 years ago

5 0

(17-.2(17))+(17+.06(17))

Kisachek [45]3 years ago

5 0

<span><span><span> ~~~~
17−<span><span>(0.2)</span><span>(17)</span></span></span>+17</span>+<span><span>(0.06)</span><span>(17)</span></span></span><span>=<span><span><span>17−3.4</span>+17</span>+<span><span>(0.06)</span><span>(17)</span></span></span></span><span>=<span><span>13.6+17</span>+<span><span>(0.06)</span><span>(17)</span></span></span></span><span>=<span><span>13.6+17</span>+1.02</span></span><span>=<span>13.6+18.02</span></span><span>=<span>31.62</span></span>

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TV advertising agencies face increasing challenges in reaching audience members because viewing TV programs via digital streamin

choli [55]

Answer:

a) The 99% confidence interval would be given (0.523;0.577).

We are 99% confident that this interval contains the true population proportion.

b) $n=\frac{0.55(1-0.55)}{(\frac{0.03}{2.58})^2}=1830.51$

And rounded up we have that n=1831

Step-by-step explanation:

Data given and notation

n=2341 represent the random sample taken

X represent the people that they have watched digitally streamed TV programming on some type of device

$\hat p=0.55$ estimated proportion of people that they have watched digitally streamed TV programming on some type of device

$\alpha=0.01$ represent the significance level

Confidence =0.99 or 99%

z would represent the statistic for the confidence interval

p= population proportion of people that they have watched digitally streamed TV programming on some type of device

The population proportion present the following distribution:

$p \sim N (p, \sqrt{\frac{p(1-p)}{n}}$

Part a) Confidence interval

The confidence interval would be given by this formula

$\hat p \pm z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}$

For the 99% confidence interval the value of $\alpha=1-0.99=0.01$ and $\alpha/2=0.005$ , with that value we can find the quantile required for the interval in the normal standard distribution.

$z_{\alpha/2}=2.58$

And replacing into the confidence interval formula we got:

$0.55 - 2.58 \sqrt{\frac{0.55(1-0.55)}{2341}}=0.523$

$0.55 + 2.58 \sqrt{\frac{0.55(1-0.55)}{2341}}=0.577$

And the 99% confidence interval would be given (0.523;0.577).

We are 99% confident that this interval contains the true population proportion.

Part b) What sample size would be required for the width of a 99% CI to be at most 0.03 irrespective of the value of p??

The margin of error for the proportion interval is given by this formula:

$ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$ (a)

And on this case we have that $ME =\pm 0.03$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

And replacing into equation (b) the values from part a we got:

$n=\frac{0.55(1-0.55)}{(\frac{0.03}{2.58})^2}=1830.51$

And rounded up we have that n=1831

8 0

4 years ago

What word expression matches 3+(4×12)

AnnyKZ [126]

The Word Expression Would Be:

<em><u>Four times twelve plus three</u></em>

Any Additional Questions? Comment Below!

<em><u>-AnonymousGiantsFan</u></em>

8 0

3 years ago

662/3% of what number is 320?

sweet [91]

It's similar to example above,I hope you get it.

4 0

4 years ago

Answers this plz I need help

san4es73 [151]

Answer:

y=2x+5

Step-by-step explanation:

u find the slope and since the y intercept is (0,5), that's the b value

hope this helps

3 0

3 years ago

Read 2 more answers

What is the equation of a line through the point (2,3) and is parallel to y=4x-1

Iteru [2.4K]

Answer:

The equation of this line would be y = 4x - 5

Step-by-step explanation:

In order to find this equation we must first find the slope of the original line. The original slope (the coefficient of x) is 4, which means the new slope will also be 4 because parallel lines have the same slope. Now, we can use this slope along with the point in point-slope form to find the equation of the line.

y - y1 = m(x - x1)

y - 3 = 4(x - 2)

y - 3 = 4x - 8

y = 4x - 5

7 0

4 years ago