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xxTIMURxx [149]
3 years ago
14

When constructing a Confidence Interval for the population mean and both the sample standard deviation and the population standa

rd deviation are known, which of the following should be used?
(A) normal distribution using the sample standard deviation
(B) normal distribution using the population standard deviation
(C) student-t distribution using the population standard deviation
(D) student-t distributuion using the sample standard deviation
Mathematics
1 answer:
Bingel [31]3 years ago
6 0

Answer: idk

Step-by-step explanation:

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All solutions to the equation 3 cos (5t) + 3 = 2 in the interval from 0 to π will be 0.3821, 0.2462, and 0.8745. Then the correct option is A.

<h3>What is trigonometry?</h3>

The connection between the lengths and angles of a triangular shape is the subject of trigonometry.

The equation is given below.

3 cos (5t) + 3 = 2

By simplifying the equation, then we have

3 cos 5t = -1

   cos 5t = -1/3

Then the value of t will be

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Then the correct option is A.

More about the trigonometry link is given below.

brainly.com/question/22698523

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X is greater than y by 12 and Z is less than y by 8. If the ratio of x:z is 9:4. What is the ratio of value of Z?
kakasveta [241]

Answer:

B) 16 . . . . the value of Z

Step-by-step explanation:

The problem statement tells us that ...

... x = y +12

... z = y - 8

Then x - z = (y +12) -(y -8) = 20.

In ratio units, we have ...

... x:z = 9:4

The difference of these in ratio units is 9-4 = 5, so each ratio unit must stand for 20/5 = 4 units of X, Y, or Z. Hence ...

... Z = 4·4

... Z = 16

_____

<em>Check by finding the other values</em>

... X = 9·4 = 36

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3 years ago
Simplify -2[9 - (x + 7)]
tiny-mole [99]
Hey there! -2[9 - (x + 7)] \\ \\ \\( -2(9) + -2(-x) + -7) \\ \\ -2(9)  +-2(-x) + -2 (-7) \\ \\ \\ -2(9) = -18 \\-2(-x) = 2x \\ -2(-7) = 14 \\ \\ \\  -18 + 2x + 14 \\ \\ \\ \\ Combine \\ like\\ terms: -18 , 14 \\ \\ \\ -18 +14 = -4 \\ \\ \\ \\ Answer: 2x - 4 \\ \\ \\ \\ \\ \\ Good\\ luck \\ on \\ your \\ assignment \\ and \\ enjoy \\ your \\ day!

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