Fundamentals of Biostatistics
Fundamentals of Biostatistics
8th Edition
ISBN: 9781305268920
Author: Bernard Rosner
Publisher: Cengage Learning
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Chapter 5, Problem 1P

Because serum cholesterol is related to age and sex, some investigators prefer to express it in terms of z-scores. If X = raw serum cholesterol, then Z = X μ σ , where μ is the mean and σ is the standard deviation of serum cholesterol for a given age–gender group. Suppose Z is regarded as a standard normal random variable.

What is Pr(Z < 0.5)?

Expert Solution & Answer
Check Mark
To determine

Find probability P(Z<0.5).

Answer to Problem 1P

Probability, P(Z<0.5), is 0.6915.

Explanation of Solution

Step-by step procedure to obtain the probability value using software is given below:

  • Open an EXCEL sheet.
  • In cell A1, enter “=NORM.S.DIST(0.5,1)”.
  • Click Enter.

The output obtained is shown below:

Fundamentals of Biostatistics, Chapter 5, Problem 1P

Thus, the probability, P(Z<0.5),is 0.6915.

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Chapter 5 Solutions

Fundamentals of Biostatistics

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