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finlep [7]
3 years ago
15

Can someone please help me with thiss!?

Mathematics
1 answer:
DIA [1.3K]3 years ago
5 0

I would first find the volume of the hole and multiply that by 2 because there's 2 holes.

v = lwh

v = (5)(8)(5)

v = 200

200 \times 2 = 400

//

I would then find the volume of the entire cinder block.

v = lwh

v = (16)(8)(8)

v = 1024

//

I would then substract.

1024 - 400 = 624

The volume of the cinder blocks is 624 inches³

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Suppose you read online that children first count to 10 successfully when they are 32 months old, on average. You perform a hypo
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Answer:

p_v =2*P(t_{(35)}  

Step-by-step explanation:

Assuming this info from R

hist(gifted$count)

##    Min. 1st Qu.  Median    Mean 3rd Qu.    Max.  

##   21.00   28.00   31.00   30.69   34.25   39.00

## Sd

## [1] 4.314887

Data given and notation  

\bar X=30.69 represent the mean  

s=4.3149 represent the sample standard deviation

n=36 sample size  

\mu_o =32 represent the value that we want to test

\alpha represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the mean is different than 32, the system of hypothesis would be:  

Null hypothesis:\mu = 32  

Alternative hypothesis:\mu \neq 32  

If we analyze the size for the sample is > 30 but we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:  

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}  (1)  

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic

We can replace in formula (1) the info given like this:  

t=\frac{30.69-32}{\frac{4.3149}{\sqrt{36}}}=-1.822    

P-value

The first step is calculate the degrees of freedom, on this case:  

df=n-1=36-1=35  

Since is a two sided test the p value would be:  

p_v =2*P(t_{(35)}  

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Answer:

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Step-by-step explanation:

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OR
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