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Vesnalui [34]
3 years ago
5

-4n+3>23 A. -5 B. 5 C. -9 D. -20 E. 20

Mathematics
1 answer:
Pani-rosa [81]3 years ago
6 0
It will be 20 after u subtract
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In Vindales wig shop 1/4 of the wigs are blonde and 1/4 of wigs are brunette. What fraction of the wigs are either blonde or bru
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A true/false test has 40 questions. Suppose a passing grade is 30 or more correct answers. Test the claim that a student knows m
Angelina_Jolie [31]

Answer:

z≈3.16

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Step-by-step explanation:

As a result of step 2, we can assume normal distribution for the null hypothesis

<em>step 3:</em>

z statistic is computed as follows:

z=\frac{X-M}{\frac{\sqrt{p*(1-p)} }{\sqrt{N} } } where

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  • p is the probability of correct answer (0.5)
  • N is the total number of questions in the test (40)

z=\frac{0.75-0.50}{\frac{\sqrt{0.5*(0.5)} }{\sqrt{40} } } ≈ 3.16

And corresponding p value for the z-statistic is p≈0.001.

Since p<0.05, we reject the null hypothesis and conclude that the student knows more than half of the answers and is not just guessing in 0.05 significance level.

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Step-by-step explanation:

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