alesterp

2021-02-08

In the EAI sampling problem, the population mean is $ 71,500 and the population standard deviation is $5000. For $n=30,\text{}\text{there is a}\text{}0.4908\text{}\text{probability of obtaining a sample mean within}\text{}\pm \text{}\$\text{}600$ of the population mean.

a) What is the probability that$\overline{x}$ is within $ 600 of the population mean is a sample of size 60 is used (to 4 decimals)?

b) Answer part (a) for a sample of size 120 (to 4 decimals).

a) What is the probability that

b) Answer part (a) for a sample of size 120 (to 4 decimals).

Sadie Eaton

Skilled2021-02-09Added 104 answers

a) The probability that

The probability of z less than

The probability of z less than

The required probability value is,

Thus, the probability that x- is within $600 of the population mean if a sample of size 60 used is 0.6476.

b) The probability that x- is within $600 of the population mean if a sample of size 120 used is,

The probability of z less than

The probability of z less than

The required probability value is,

What is the area of the parallelogram with vertices A(-3, 0), B(-1, 5), C(7, 4), and D(5, -1)?

How to expand and simplify $2(3x+4)-3(4x-5)$?

Find an equation equivalent to ${x}^{2}-{y}^{2}=4$ in polar coordinates.

How to graph $r=5\mathrm{sin}\theta$?

How to find the length of a curve in calculus?

When two straight lines are parallel their slopes are equal.

A)True;

B)FalseIntegration of 1/sinx-sin2x dx

Converting percentage into a decimal. $8.5\%$

Arrange the following in the correct order of increasing density.

Air

Oil

Water

BrickWhat is the exact length of the spiraling polar curve $r=5{e}^{2\theta}$ from 0 to $2\pi$?

What is $\frac{\sqrt{7}}{\sqrt{11}}$ in simplest radical form?

What is the slope of the tangent line of $r=-2\mathrm{sin}\left(3\theta \right)-12\mathrm{cos}\left(\frac{\theta}{2}\right)$ at $\theta =\frac{-\pi}{3}$?

How many integers from 0 to 50, inclusive, have a remainder of 1 when divided by 3?

Use the summation formulas to rewrite the expression $\Sigma \frac{2i+1}{{n}^{2}}$ as i=1 to n without the summation notation and then use the result to find the sum for n=10, 100, 1000, and 10000.

How to calculate the right hand and left hand riemann sum using 4 sub intervals of f(x)= 3x on the interval [1,5]?