3 years ago

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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An equilateral triangle has an altitude of 45. Find the length of a side of the triangle.

sukhopar [10]

Answer:

See attachment.

If altitude = 45 then

side = 2 * height (or altitude) / square root of 3

side = 2 * 45 / 1.7320508076

side = 90 / 1.7320508076

side = 51.9615242271

Step-by-step explanation:

6 0

4 years ago

HELP:Sarah, who is 19 feet away from Justin, has a ball in her hand. Sarah throws the ball away from Justin at a speed of 5 feet

Paha777 [63]

Answer:

Justin is 1 feet far away from Brandon

Step-by-step explanation:

As shown in the diagram, we let the distance between Justin and Brandon be x

$Speed = \frac{distance}{time}$

from the question

the total time taken by the ball to reach Brandson=4s

Also the total distance is travelled by the ball=19+x

while the average speed=5ft/s

By substitution we obtain

$5 = \frac{19 + x}{4}$

$\implies4 \times 5 = 19 + x$

$\implies20=19 + x$

$\implies20 - 19 = x$

x=1 feet

3 0

3 years ago

Assuming the pattern continues, what are the next three terms in the pattern: Z, x, V, t, ______?

Nookie1986 [14]

I believe the answer is 4) R, p, N. I hope this helps

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3 years ago

For each of the values of h given, when x is increased from 1 to 1+h, work out:

borishaifa [10]

This exercise should show you that as h approaches zero you get the value of the derivative of x^2 at x=1.

the change in x^2) / h
h=1___
h=.1____
h=0.1_____
h=.001___

change in x^2 = (1+h)^2 - 1^2 = (1+h)^2 - 1

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3 years ago

Use the list method to write "The perfect square integers between 1 and 80 inclusive".

xenn [34]

I don't know the list method you have learned.
The perfect square integers between 1 and 80 inclusive are ...

1
4
9
16
25
36
49
64

6 0

4 years ago

Read 2 more answers