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2 years ago

Can someone help me please (brainiest and 50 points)

Mathematics

2 answers:

Bas_tet [7]2 years ago

7 0

Step-by-step explanation:

12 ft sq.

4 ft

12-4( doors)=8

goblinko [34]2 years ago

6 0

Answer:1. 12 ft sq.

2. 4 ft

3. 12 - 4(doors) = 8

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Write down the factors of 55. Is 55 a prime or composite number? Explain how you know.

horsena [70]

Answer:

Composite.

Step-by-step explanation:

because Prime numbers can only be recived when mulipltiy the number and itself, like 3.

55 can be mulipled by 1 AND 11 to get 55

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3 years ago

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3 years ago

Pls help i need this asap

Zielflug [23.3K]

Answer:

Let x = # of commercials

y = # of movies

<u>System of Equations:</u>

x + y = 90

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Step-by-step explanation:

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1 year ago

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2 years ago

1) If the alpha level is changed from α = .05 to α = .01, what happens to boundaries for the critical region?

Alexxandr [17]

Answer:

1) a. Move farther into the tails

2) a. Decreases

Step-by-step explanation:

Hello!

Let's say for example that you are making a confidence interval for the mean, using the Z-distribution:

X[bar] ± $Z_{1-\alpha /2}$ * $\frac{Sigma}{\sqrt{n} }$

Leaving all other terms constant, this are the Z-values for three different confidence levels:

90% $Z_{0.95}= 1.648$

95% $Z_{0.975}= 1.965$

99% $Z_{0.995}= 2.586$

Semiamplitude of the interval is

d= $Z_{1-\alpha /2}$ * $\frac{Sigma}{\sqrt{n} }$

Then if you increase the confidence level, the value of Z increases and so does the semiamplitude and amplitude of the interval:

↑d= ↑ $Z_{1-\alpha /2}$ * $\frac{Sigma}{\sqrt{n} }$

They have a direct relationship.

So if you change α: 0.05 to α: 0.01, then the confidence level 1-α increases from 0.95 to 0.99, and the boundaries move farther into the tails.

The significance level of a hypothesis test is the probability of committing a Type I error.

If you decrease the level from 5% to 1%, then logically, the probability decreases.

I hope this helps!

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3 years ago