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Ivan
3 years ago
7

If x + 3 = 9 then x = A: 3 B: 9 C: 12 D: 27 E: none of the above

Mathematics
2 answers:
Yuki888 [10]3 years ago
7 0

Answer:

E

Step-by-step explanation:

do 9-3 and it's gonna be 6

Scorpion4ik [409]3 years ago
3 0

Answer:

E: non of the above

Step-by-step explanation:

you subtract 3 from 9 and your answer is 6 so x=6

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p_v =P(t_{74}    

If we compare the p value and a significance level for example \alpha=0.1 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, so we can conclude that the true mean it's not significantly less than 20 min.

Step-by-step explanation:

Data given and notation    

\bar X=18.81 represent the average lateral recumbency for the sample    

s=8.4 represent the sample standard deviation    

n=75 sample size    

\mu_o =20 represent the value that we want to test    

\alpha represent the significance level for the hypothesis test.    

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

State the null and alternative hypotheses.    

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Alternative hypothesis :\mu < 20  

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The statistic for this case 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".    

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

t=\frac{18.81-20}{\frac{8.4}{\sqrt{75}}}=-1.227

The degrees of freedom are given by:

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Give the appropriate conclusion for the test  

Since is a one side left tailed test the p value would be:    

p_v =P(t_{74}    

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