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puteri [66]
3 years ago
9

Find the area of the figure. A) 114 cm2 B) 350 cm2 C) 418 cm2 Eliminate D) 447 cm2

Mathematics
1 answer:
ANEK [815]3 years ago
5 0

Answer:

418cm2

Step-by-step explanation:

Separate the figure into a square and a triangle. Find the area of each and add.

s2 = area of square

192 = 361 cm

bh = area of triangle

(6)(19) = 57 cm2

361 + 57 = 418 cm2

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It is advertised that the average braking distance for a small car traveling at 65 miles per hour equals 120 feet. A transportat
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Answer:

State the null and alternative hypotheses.  

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Part 2

Calculate the statistic

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

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

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Step-by-step explanation:

Data given and notation  

\bar X=114 represent the sample mean  

\sigma=22 represent the population standard deviation

n=36 sample size  

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\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)  

Part 1

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the mean is equal to 120 or not, the system of hypothesis would be:  

Null hypothesis:\mu = 120  

Alternative hypothesis:\mu \neq 120  

If we analyze the size for the sample is > 30 and we  know the population deviation so is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:  

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}  (1)  

z-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".  

Part 2

Calculate the statistic

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

z=\frac{114-120}{\frac{22}{\sqrt{36}}}=-1.636    

P-value

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

p_v =2*P(z  

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