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disa [49]
3 years ago
10

N/6 = 15/4 N=____? Help please

Mathematics
2 answers:
Galina-37 [17]3 years ago
7 0

Answer:

N = 22.5

Step-by-step explanation:

N/6 = 15/4

Using cross products

4N = 6*15

4N = 90

Divide each side by 4

4N /4 = 90/4

N = 45/2

N = 22.5

Law Incorporation [45]3 years ago
3 0

Answer: N=22.5

Step-by-step explanation:

N/6=15/4

N*4=15*6

4N=90

4N/4=90/4

N=22.5

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Step-by-step explanation:

Data given and notation

\bar X=3.4 represent the sample mean  

\sigma=0.4 represent the population deviation for the sample

n=50 sample size  

\mu_o =3.3 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)  

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Null hypothesis:\mu \leq 3.3  

Alternative hypothesis:\mu > 3.3  

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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".  

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

z=\frac{3.4-3.3}{\frac{0.4}{\sqrt{50}}}=1.768  

P value

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

p_v =P(z>1.768)=0.039  

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