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alexandr1967 [171]
3 years ago
11

What is 25% of 8 i really need the answer

Mathematics
2 answers:
Debora [2.8K]3 years ago
8 0

Answer:

2

Step-by-step explanation:

Anarel [89]3 years ago
3 0

Answer:

2

Step-by-step explanation:

8/4 = 2

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Big babies: The National Health Statistics Reports described a study in which a sample of 354 one-year-old baby boys were weighe
Vedmedyk [2.9K]

Answer:

Yes. The data provide enough evidence to support the claim that the mean weight of one-year-old boys is greater than 25 pounds.

P-value=P(t>2.84)=0.0024

Step-by-step explanation:

Hypothesis test on the population mean.

The claim is that the mean weight of one-year-old boys is greater than 25 pounds.

Then, the null and alternative hypothesis are:

H_0: \mu=25\\\\H_a:\mu>25

The significance level is α=0.05.

The sample size is n=354. The sample mean is 25.8 pounds and the sample standard deviation is 5.3 pounds. As the population standard deviation is estimated from the sample standard deviation, we will use a t-statistic.

The degrees of freedom are:

df=n-1=354-1=353

The t-statistic is:

t=\dfrac{\bar x-\mu}{s/\sqrt{n}}=\dfrac{25.8-25}{5.3/\sqrt{354}}=\dfrac{0.8}{0.2817}=2.84

For a right tailed test and 353 degrees of freedom, the P-value is:

P-value=P(t>2.84)=0.0024

As the P-value is smaller than the significance level, the effect is significant and the null hypothesis is rejected.

There is enough evidence to support the claim that the mean weight of one-year-old boys is greater than 25 pounds.

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2 years ago
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nata0808 [166]

Answer:

Step-by-step explanation:

x=100 (vertically opposite angle)

6 0
3 years ago
Find a solution to y″+9y=6sin(3t).
QveST [7]
 <span>y" + 9y = 0 
m^2 + 9 = 0 
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yH = C1 cos 3t + C2 sin 3t 

yP = C3 t sin 3t + C4 t cos 3t
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Please help me! Thank you in advance!
Vladimir79 [104]

Answer: 16

Step-by-step explanation:

The diameter of the circle is the length of the square as well meaning the area of the square is 4 x 4 = 16

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2 years ago
Choose the correct equation type for each system.
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first one

Step-by-step explanation:

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