3 years ago

Pag si X! si X na don't alam alam Y its your X breaks on you What does this mean

Mathematics

2 answers:

Elena-2011 [213]3 years ago

8 0

Answer:

???

Step-by-step explanation:

Elena-2011 [213]3 years ago

8 0

I wouldn’t know lol

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A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is σ = 15. a. Compute the

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Answer:

a) (76.21,83.79)

b) (77.32,82.68)

c) Interval decreases

Step-by-step explanation:

We are given the following information in the question:

Sample size, n = 60

Sample mean = 80

Sample standard Deviation, s = 15

a) 95% Confidence interval:

$\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}$

Putting the values, we get,

$z_{critical}\text{ at}~\alpha_{0.05} = 1.96$

$80 \pm 1.96(\dfrac{15}{\sqrt{60}} ) = 80 \pm 3.79 = (76.21,83.79)$

b) Sample size, n = 120

95% Confidence interval:

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3 years ago

Which expression is equivalent to

dimulka [17.4K]

Answer:

Step-by-step explanation:

x^2 - 7x + 12 + (x - 3)^2 Add (x - 3)^2 after it has been expanded.

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2x^2 -7x - 6x + 21

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Which is exactly what D says.

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