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3 years ago

Why is random sampling preferred over other methods of sampling?

Mathematics

1 answer:

Anna [14]3 years ago

5 0

Answer:

Step-by-step explanation:

It's a random sample, so anyone could be sampled. Everyone has the same rate of being sampled, therefore the results are fair and equal.

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The expression 0.08x+(x−200) models the final price of a computer with an instant rebate in a state that charges a sales tax. Th

Flura [38]

Thank you For Posting This Question And Here Is How To Find The Answer:

X is the Original Cost

8% is the Tax Rate

0.08x is the Amount You Pay In Tax

So the Answer is B!

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3 years ago

In 2011, the industries with the most complaints to the Better Business Bureau were banks, cable and satellite television compan

ale4655 [162]

Answer:

Step-by-step explanation:

Hello!

The variable of study is

X: number of complaints per industry (Categorized: Bank, Cable, Car, Cell, Collection

Considering this is a categorical variable, and the hypothesis is that all categories have the same probability, you have to apply a Chi-Square Goodness to Fit test.

Observed frequencies per category

1) Bank: 26

2) Cable: 44

3) Car: 42

4) Cell: 60

5) Collection: 28

Total= 200

Statistical hypotheses:

H₀: P₁=P₂=P₃=P₄=P₅=1/5

H₁: At least one of the proposed proportions is different.

α: 0.01

$X^2= sum \frac{(O_i-E_i)^2}{E_i} ~~X^2_{k-1}$

For this test the formula for the expected frequencies is:

$E_i= n * P_i$

So the expected values for each category is:

$E_1= n * P_1= 200*1/5= 40$

$E_2= n * P_2= 200*1/5= 40$

$E_3= n * P_3= 200*1/5= 40$

$E_4= n * P_4= 200*1/5= 40$

$E_5= n * P_5= 200*1/5= 40$

$X^2_{H_0}= \frac{(26-40)^2}{40} +\frac{(44-40)^2}{40} +\frac{(42-40)^2}{40} +\frac{(60-40)^2}{40} +\frac{(28-40)^2}{40} = 11.5$

This test is one tailed and so is its p-value, under a Chi-square with 4 degrees of freedom p-value: 0.021484.

The p-value is less than the significance level so the decision is to reject the null hypothesis.

c. The industry with most complaints is the cellular phone providers

I hope this helps!

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4 years ago

What’s the equation for the graph shown below

Mumz [18]

Y=2x
Your slope is 2/1=2 and it goes through the origin so y-intercept is zero.

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3 years ago

Read 2 more answers

Every ten years, the bureau of the census counts the number of people living in the united states. in 1790, the population of th

DanielleElmas [232]

If you are trying to see how much the population is in 1800, it is 9.24 million. You add the population from 1790 and the amount it has grown for 1800.

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4 years ago

Find the general solution to y" – 8 y' + 15 y=0.

Katyanochek1 [597]

Answer:

y" - 8y' + 15y = 0

2nd order Homogeneous DE.

Solving Quadratically

k² - 8k + 15 = 0

k= 5 or k= 3.

Two real and Unequal roots.

y= Ae^5x + Be^3x.

4 0

3 years ago

Why is random sampling preferred over other methods of sampling?

Why is random sampling preferred over other methods of sampling?