What is 644,400,000 in standard form

If you want to construct a 90% confidence interval, what critical value (z*) should you use? Group of answer choices 2.576 1.960

Rom4ik [11]

Answer:

For this case we know that the confidence level is 90% so then the significance level is $\alpha=1-0.9 =0.1$ and $\alpha/2 =0.05$ . And we can find in the normal standard distribution a value who accumulates 0.5 of the area on each tail and we got:

$z_{\alpha/2}= \pm 1.645$

And the best option would be:

1.645

Step-by-step explanation:

We assume that the parameter of interest is $\theta$ and we can assume that the distribution for this parameter is normally distributed so then the confidence interval assuming a two sided interval is given by:

$\hat \theta \pm z_{\alpha/2} SE$

Where $\hat \theta$ represent the estimator for the parameter, SE the standard error and $z_{\alpha/2}$ the critical value.

For this case we know that the confidence level is 90% so then the significance level is $\alpha=1-0.9 =0.1$ and $\alpha/2 =0.05$ . And we can find in the normal standard distribution a value who accumulates 0.5 of the area on each tail and we got:

$z_{\alpha/2}= \pm 1.645$

And the best option would be:

1.645

6 0

3 years ago

What are the intercepts of the function?

snow_tiger [21]

Answer:

x-int: (-1, 0), (-11, 0)

y-int: (0, 11)

Step-by-step explanation:

To find x-int, set equation equal to 0:

x² + 12x + 11

(x + 1)(x + 11)

x = -11, -1

To find y-int, set <em>x</em> = 0

f(0) = 0² + 12(0) = 11

f(0) = 11

7 0

4 years ago

Several surveys in the United States and Europe have asked people to rate their happiness on a scale of 3 = "very happy," 2 = "f

Rudik [331]

Answer:

Step-by-step explanation:

We have to find the reported happiness of person of family income of $25,000, $35,000 and $45,000

Given that the formula for finding relation between a people happiness and his income is

y = 0.065x - 0.613

a) find the happiness of person of family income os $25,000

we put x = 25 as in the equation above

$y=0.065(25)-0.613\\\\=1.625-0.613\\\\=1.02 \approx 1$

Hence, person happiness with with family income of $25,000 on a scale of 3 is y = 1

That means they come under catergory "not to happy"

b) Find the happiness of person of family income os $35,000

we put x = 35 as in the equation above

$y=0.065(35)-0.613\\\\=1.667-0.613\\\\=1.667 \approx 1.7$

Hence, person happiness with with family income of $35,000 on a scale of 3 is y = 1.7

That means they come under catergory "not to happy" and "fairly happy"

c) Find the happiness of person of family income os $45,000

we put x = 45 as in the equation above

$y=0.065(45)-0.613\\\\=2.925-0.613\\\\=2.312 \approx 2.3$

Hence, person happiness with with family income of $45,000 on a scale of 3 is y = 2.3

That means they come under catergory "fairly happy"

8 0

4 years ago

Last three digit of cube of 500 is 0

Shkiper50 [21]

Answer:

true

Step-by-step explanation:

7 0

3 years ago

Find the values of x and y?<br> HELPPPPPPPP

ehidna [41]

x is 90 y is 43 im pretty sure

7 0

4 years ago