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const2013 [10]
2 years ago
9

A random sample of 20 items is selected (from a population with an unknown population standard deviation). When computing a conf

idence interval for the population mean, what number of degrees of freedom should be used to determine the appropriate t-value?
Mathematics
1 answer:
Ede4ka [16]2 years ago
7 0

Answer:

degree of freedom is 19

Step-by-step explanation:

Given data

sample = 20

to find out

degree of freedom

solution

we know degree of freedom formula

that is

degree of freedom =  sample -1

we have given sample 20

so

degree of freedom = 20 -1

so degree of freedom is 19

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SVEN [57.7K]

Answer:

6x³ - 8x + 9

Step-by-step explanation:

Step 1: Write out expression

2x + 7 + 6x³ - 1 + 3 - 6x - 4x

Step 2: Combine like terms (x)

6x³ - 8x + 7 - 1 + 3

Step 3: Combine like terms (constants)

6x³ - 8x + 9

5 0
3 years ago
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Answer:

B)  1/4

Step-by-step explanation:

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Amiraneli [1.4K]

Given:

The given equation is

2x^3-3x^2+18x-27=0

To find:

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Solution:

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2x^3-3x^2+18x-27=0

It can be written as

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x=\dfrac{3}{2} and x=\pm\sqrt{-9}

We know that x=\pm\sqrt{-9} is an imaginary number because there is a negative sign under the square root.

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Answer:

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