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3 years ago

The picture above tap and tell me yes or no in order thank you :)

Mathematics

2 answers:

san4es73 [151]3 years ago

6 0

Answer:

a. yes

b. no

c. yes

d. yes

have a nice day;)

artcher [175]3 years ago

4 0

Step-by-step explanation:

no,yes,no, d is probably yes I guess

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Stanford University's soccer field has an area of 8,800 square yards. Its length is 30 yards longer than its width. Write an equ

Usimov [2.4K]

Let x = the width and x + 30 = the length.

x(x + 3) = 8800

x^2 + 3x = 8800

x^2 + 3x - 8800 = 0

Using the Quadratic Formula, I get x ≈ 92.320 yd and x + 30 ≈ 122.320 yd.

2x + 2x + 60 = 600

4x + 60 = 600

4x = 540

x = 135

x + 30 = 165

The area would be 22275 yd^2.

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My brother wants to estimate the proportion of Canadians who own their house.What sample size should be obtained if he wants the

AVprozaik [17]

Answer:

a) $n=\frac{0.675(1-0.675)}{(\frac{0.02}{1.64})^2}=1475.07$

And rounded up we have that n=1476

b) $n=\frac{0.5(1-0.5)}{(\frac{0.02}{1.64})^2}=1681$

And rounded up we have that n=1681

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".

The population proportion have the following distribution

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

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)

If solve n from equation (a) we got:

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

Part a

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 90% of confidence, our significance level would be given by $\alpha=1-0.9=0.1$ and $\alpha/2 =0.05$ . And the critical value would be given by: