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3 years ago

Find cosine of angle a

Mathematics

1 answer:

Hunter-Best [27]3 years ago

6 0

Answer:

ଆପଣ ଅଧ୍ୟୟନ କରିପାରିବେ ଏବଂ ଇଣ୍ଟରନେଟ୍ ବ୍ୟବହାର କରି ଆପଣଙ୍କର ସମୟ ନଷ୍ଟ କରିପାରିବେ ନାହିଁ :)

Step-by-step explanation:

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2 years ago

Find two numbers a and b whose sum a+b is -4 and whose difference a−b is -4.

Pepsi [2]

The answer is a = -4 and b = 0.

We can solve this by looking at a system of equations using what was given

a + b = -4
a - b = -4

Then add then two equations together.

2a = -8 ---> then divide by 2 for your a value
a = -4

You can then put that into the equation and solve for b.

-4 + b = -4 ---> add 4 to both sides
b = 0

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3 years ago

A study finds that college students found it unpleasant to sit alone and think.1 The same article describes a second study in wh

Alisiya [41]

Answer:

Assuming a confidence level of 95%.

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 for this case is given by: $SE= 0.154$

$(0.667-0.25) - 1.96*0.154=0.115$

$(0.667-0.25) + 1.96*0.154=0.719$

And the 95% confidence interval for the difference of the two proportions would be given (0.115;0.719).

Step-by-step explanation:

Previous concepts

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".

$p_A$ represent the real population proportion for brand A

$\hat p_A =\frac{12}{18}=0.667$ represent the estimated proportion for male

$n_A=18$ is the sample size required for male

$p_B$ represent the real population proportion for female

$\hat p_B =\frac{6}{24}=0.25$ represent the estimated proportion for female

$n_B=24$ is the sample size required for female

$z$ represent the critical value for the margin of error

The population proportion have the following distribution

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

Solution to the problem

The confidence interval for the difference of two proportions would be given by this formula

$(\hat p_A -\hat p_B) \pm z_{\alpha/2} \sqrt{\frac{\hat p_A(1-\hat p_A)}{n_A} +\frac{\hat p_B (1-\hat p_B)}{n_B}}$

Assuming a confidence level of 95%.

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 for this case is given by: $SE= 0.154$

And replacing into the confidence interval formula we got:

$(0.667-0.25) - 1.96*0.154=0.115$

$(0.667-0.25) + 1.96*0.154=0.719$

And the 95% confidence interval for the difference of the two proportions would be given (0.115;0.719).

7 0

3 years ago

Please help me this teacher is going to fast for me

Brilliant_brown [7]

Answer:

the first rental

34x + 0.50y

Second

20x + 0.75y

Step-by-step explanation:

8 0

2 years ago

Find cosine of angle a ​

Find cosine of angle a