The choice between a z-test and a t-test for a population mean depends primarily on:

1 answer:

6 0

Z-test should be used when the parent standard deviation is known and the sample size is greater than or equal to 30 (to satisfy the Central Limit Theorem). A T-test should be used when these two rules do not apply.

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Evaluate the expression for x = 8, y = 4: x + 10/y+5

Nesterboy [21]

Answer:

Solution,

X=8

y=4

Now,

 $\frac{x + 10}{y + 5} \\ = \frac{8 + 10}{4 + 5} \\ = \frac{18}{9} \\ = 2$ 

hope this helps...

Good luck on your assignment..

5 0

3 years ago

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Five-sevenths of a number is -35. what is the number?

White raven [17]

So lets write this equation out. Let x be that number we are trying to find.

So five-sevenths is a fraction that is written like this

5/7

when you see the word "of" that means multiplication

so we can write the full equation.

(5/7)x = -35

now we can solve

Multiply both sides by 7

5x = -245

now divide by 5
and we get

x = -49

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3 years ago

Sighting from a helicopter:A helicopter hovered at an altitude that is 1000 feet above a mountain peak of altitude 5210 feet A s

ICE Princess25 [194]

We can conclude that the the two peaks are 816.11 feet apart, and the altitude of the taller peak is 5475.17 feet.

Please check the detailed explanation in the images attached, and let me know what you think. :)

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3 years ago

Please please help asap right answers only

yan [13]

Answer:

top right

Step-by-step explanation:

you need at least 40 dollars and that equation is a+15 is greater than or equal to 40, which is true in this circumstance.

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3 years ago

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If 4 quarts of organic grapes cost $20 how many quarts can you purchase for one dollar

Eva8 [605]

Answer:

4/5 of a quart

Step-by-step explanation:

Set this up as a proportion. First of all we know that 4 quarts of organic grapes cost $20, so 4x = 20. Divide and you get that x = 5 meaning 1 quart equals 5 dollars. Now if we scale this down a bit and divide by 5, we end up with 4/5 of a quart = 1$.

Hope this helped (:

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3 years ago