SOLUTION: Please help me in answering this question. In a standard normal distribution, what is the probability of randomly selecting a value between -2.555 and -0.745? Round to four decimal

Question 401245: Please help me in answering this question. In a standard normal distribution, what is the probability of randomly selecting a value between -2.555 and -0.745? Round to four decimal places.
Also 16. Determine the appropriate approach to conduct a hypothesis test for this claim: Fewer than 5% of patients experience negative treatment effects. Sample data: Of 500 randomly selected patients, 2.2% experience negative treatment effects.
A) Use the normal distribution.
B) Use the Student t distribution.
C) Use the chi-square distribution.
D) Use nonparametric or bootstrapping methods.
Thank you
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Please help me in answering this question. In a standard normal distribution, what is the probability of randomly selecting a value between -2.555 and -0.745? Round to four decimal places.
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P(-2.555 < z < 0.745) = 0.7599
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Also 16. Determine the appropriate approach to conduct a hypothesis test for this claim: Fewer than 5% of patients experience negative treatment effects. Sample data: Of 500 randomly selected patients, 2.2% experience negative treatment effects.
A) Use the normal distribution.
B) Use the Student t distribution.
C) Use the chi-square distribution.
D) Use nonparametric or bootstrapping methods.
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The test is a test of proportions.
Use the normal distribution or Z-Test.
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Cheers,
Stan H.

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