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storchak [24]
3 years ago
6

Add the two expressions. −6m+10 and 9m−9 Enter your answer in the box.

Mathematics
1 answer:
mixer [17]3 years ago
8 0
3m+1 I’m pretty sure
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In a recent year the fuel economy of all passenger vehicles was 19.8 mpg. A trade organization sampled 50 passenger vehicles for
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Answers and Step-by-step explanation:

Hypotheses are:

H o=19.8

H 1 ≠19.8

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s=2.45, X bar=20.1, n=50

So test statistics will be

t=20.1-19.8/(2.45/\sqrt{50} =0.87

Degree of freedom : d f = n - 1 = 50 - 1 =49

Test is two tailed so critical value of the test is -1.30 and 1.30.

Rejection region:

if t < -1.30 and t > 1.30, reject H o

Since test statistics lie in the rejection region so we fail to reject the null hypothesis.

(b)

The observed significance of the test is

P value =0.3885

(c)

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