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3 years ago

14

Translate each algebraic expression into a verbal expression. Then compare and contrast the two verbal expressions. What do you

notice?
\sqrt{x}-4
\sqrt{x-4}

1 answer:

Lostsunrise [7]3 years ago

3 0

Answer:

Step-by-step explanation:y=Mx+b

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A Pew Internet poll asked cell phone owners about how they used their cell phones. One question asked whether or not during the

EastWind [94]

Answer:

a) $\hat p=\frac{471}{1024}=0.460$

The standard error is given by:

$SE= \sqrt{\frac{\hat p(1-\hat p)}{n}}=\sqrt{\frac{0.460(1-0.460)}{1024}}=0.0156$

And the margin of error is given by:

$ME=z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}=1.96\sqrt{\frac{0.460(1-0.460)}{1024}}=0.0305$

b) The 99% confidence interval would be given by (0.429;0.491)

Step-by-step explanation:

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".

The population proportion have the following distribution

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

Data given and notation

n=1024 represent the random sample taken

X=471 represent the people responded that they had used their cell phone while in a store within the last 30 days to call a friend or family member for advice about a purchase they were considering

$\hat p=\frac{471}{1024}=0.460$ estimated proportion of people responded that they had used their cell phone while in a store within the last 30 days to call a friend or family member for advice about a purchase they were considering

p= population proportion of people responded that they had used their cell phone while in a store within the last 30 days to call a friend or family member for advice about a purchase they were considering

Part a

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 95% confidence interval the value of $\alpha=1-0.95=0.05$ and $\alpha/2=0.025$ , with that value we can find the quantile required for the interval in the normal standard distribution.

$z_{\alpha/2}=1.96$

The standard error is given by:

$SE= \sqrt{\frac{\hat p(1-\hat p)}{n}}=\sqrt{\frac{0.460(1-0.460)}{1024}}=0.0156$

And the margin of error is given by:

$ME=z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}=1.96\sqrt{\frac{0.460(1-0.460)}{1024}}=0.0305$

Part b

If we replace the values obtained we got:

$0.460-1.96\sqrt{\frac{0.460(1-0.460)}{1024}}=0.429$

$0.460+1.96\sqrt{\frac{0.460(1-0.460)}{1024}}=0.491$

The 99% confidence interval would be given by (0.429;0.491)

8 0

3 years ago

Question 10 pls help

Ivenika [448]

Answer:

D

Step-by-step explanation:

3 0

3 years ago

Verify the identity<br><br>

Oxana [17]

Answer:

see below

Step-by-step explanation:

sin x 1

------------------- = -----------

sec^2 x - tan ^2 x csc x

Sec = 1/cos and tan = sin/cos

sin x 1

------------------- = -----------

1/ cos ^2 x -sin^2/cos ^2 x csc x

Factor the denominator

sin x 1

------------------- = -----------

(1-sin^2 x)/ cos ^2 x csc x

We know that 1 - sin^2 x = cos ^2

sin x 1

------------------- = -----------

(cos^2 x)/ cos ^2 x csc x

sin x 1

------------------- = -----------

1 csc x

Multiply the top and bottom of the left hand side by 1/ sin x

sin x * 1/ sin x 1

------------------- = -----------

1 * 1 sin x csc x

1 1

------------------- = -----------

1 sin x csc x

We know that 1/sin x = csc

1 1

--------- = -----------

csc (x) csc x

3 0

3 years ago

2(7m−5)+(−8+9m)=?

Anna [14]

Answer:

23m-18

Step-by-step explanation:

2(7m−5)+(−8+9m)

Remove parenthesis

2(7m-5)-8+9m

expand

14m-10

14m-10-8+9

simplify

23m-18

Ask me for more questions brainliest please.

8 0

2 years ago

The perimeter of a rectangle is 68 feet. Find the dimensions of the rectangle if the ratio of the length to the width is 9:8.

irinina [24]

Length =18feet
width=16 feet

6 0

3 years ago