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3 years ago

Is this a function? if so what’s the domain and range. PLZ help plz

Mathematics

1 answer:

mars1129 [50]3 years ago

5 0

No because it clearly fails the vertical line test

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Two different simple random samples are drawn from two different populations. The first sample consists of 20 people with 9 havi

QveST [7]

Answer: $(-0.48,\ -0.04)$

Step-by-step explanation:

The confidence interval for the difference of two population proportion is given by :-

$(p_1-p_2)\pm z_{\alpha/2}\sqrt{\dfrac{p_1(1-p_1)}{n_1}+\dfrac{p_2(1-p_2)}{n_2}}$

Given : The first sample consists of 20 people with 9 having a common attribute.

Here, $n_1=20$ , $p_1=\dfrac{9}{20}=0.45$

$n_2=2100$ , $p_1=\dfrac{1492 }{2100}\approx0.71$

Significance level : $\alpha=1-0.95=0.05$

Critical value : $z_{\alpha/2}=1.96$

A 95% confidence interval for the difference of two population proportion will be :-

$(0.45-0.71)\pm z_{\alpha/2}\sqrt{\dfrac{0.45(1-0.45)}{20}+\dfrac{0.71(1-0.71)}{2100}}\\\\\approx -0.26\pm0.22\\\\=(-0.26-0.22,-0.26+0.22)\\\\=(-0.48,\ -0.04)$

3 0

4 years ago

What is equivalent to 14(2 + 6x) + 20

Reil [10]

Answer:

48+84x

Step-by-step explanation:

Distribute the 14 and add

3 0

3 years ago

Can u help me with this problem 1/2+-2/5t-1=1/5t+t

Temka [501]

1/2+-2/5t(+2/5)=1/5t+t(+2/5)
simplify
1/2=2 and 3/5t
change to a decimal
.5 = 2.6t
divide both sides by 2.6
.5/2.6 2.6t/2.6
you get T= .3125

8 0

3 years ago

Read 2 more answers

Simplify this expression: 7a/14(a+b)

dsp73

The answer you are looking for is:
$\frac{ab}{2}$ + $\frac{a^{2} }{2}$
hope that helps!!
have a wonderful day!!

4 0

4 years ago

There are 12 people in a class. 10 are randomly chosen. How many possible combinations are there?

Mazyrski [523]

long way

12 x 11 x 10 x 9 x 8 x 7 x6 x5 x4 x3x2/ 10x9x8x7x6x5x4x3x2x

but you can shorten that by crossing out identical numbers so you get 12 x 11

12 x 11 = 132 combinations

3 0

3 years ago