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2 years ago

3. What is the crucial factor for a sample selection to be random?

1 answer:

8 0

Members possibly involved must have an equal chance of being used, come from an equivalent background, be individually assigned through a random process, and all complete the study.

You might be interested in

Which of the following phrases can be used to represent -11?

Reptile [31]

Answer:

eleven below zero

Step-by-step explanation:

opposite of -11 =11 so that doesn't work

positive eleven=11 so that doesn't work

eleven greater than zero=11 so that doesn't work

eleven below zer0= -11 so it works

3 0

3 years ago

Read 2 more answers

Select the correct answer

Tcecarenko [31]

Answer:

C. 150

Step-by-step explanation:

It's right on Plato.

4 0

2 years ago

Three Nissans, two Fords, and four Chevrolets can be rented for $106 per day. At the same rates two Nissans, four Fords, and thr

Sindrei [870]

Answer:

The rental rate for the Fords is of $12 per day.

Step-by-step explanation:

This question is solved using a system of equations.

I am going to say that:

x is the cost of a Nissan.

y is the cost of a Ford.

z is the cost of a Chevrolet.

Three Nissans, two Fords, and four Chevrolets can be rented for $106 per day.

This means that:

$3x + 2y + 4z = 106$

Two Nissans, four Fords, and three Chevrolets cost $107 per day

This means that:

$2x + 4y + 3z = 107$

Four Nissans, three Fords, and two Chevrolets cost $102 per day.

This means that:

$4x + 3y + 2z = 102$

From the first equation:

$4z = 106 - 3x - 2y$

$2z = 53 - 1.5x - y$

$z = 26.5 - 0.75x - 0.5y$

Replacing into the third equation:

$4x + 3y + 53 - 1.5x - y = 102$

$2.5x + 2y = 49$

From the second equation:

$2x + 4y + 3z = 107$

$2x = 107 - 4y - 3z$

$x = 53.5 - 2y - 1.5z$

$x = 53.5 - 2y - 1.5(26.5 - 0.75x - 0.5y)$

$x - 1.125x = 53.5 - 2y - 39.75 + 0.75y$

$-0.125x = 13.75 - 1.25y$

$0.125x = 1.25y - 13.75$

$x = \frac{1.25y - 13.75}{0.125}$

$x = 10y - 110$

Find the rental rate for the Fords.

We have to find y, so:

$2.5x + 2y = 49$

$2.5(10y - 110) + 2y = 49$

$25y - 275 + 2y = 49$

$27y = 324$

$y = \frac{324}{27}$

$y = 12$

The rental rate for the Fords is of $12 per day.

3 0

3 years ago

4. What is the unit rate for a pound of seed? Circle the correct answer choice.

Vladimir79 [104]

<h3>Answer: B) $1.75</h3>

===================================================

Explanation:

To get the unit cost, we divide the total cost over the number of pounds.

We can do this for any row

row one: ($17.50)/(10) = $1.75
row two: ($35.00)/(20) = $1.75
row three: ($52.50)/(30) = $1.75
row four: ($70.00)/(40) = $1.75

You don't need to show all four row calculations. You can simply pick one row.

This tells us that each pound costs $1.75

Put another way: the price is $1.75 per pound

3 0

2 years ago

What is h(-4) for h(x) =(x-2)^2 +3x

PSYCHO15rus [73]

$(- 4 - 2)^{2} + 3( - 4) \\ = ( - 6)^{2} + ( - 12) \\ = 36 - 12 \\ = 24$
The answer is 24

7 0

3 years ago