Directions: Answer the following:
1. Assume that the cholesterol levels in a certain population have mean u = 150 and standard deviation 0 = 12. The cholesterol levels for a random sample of n = 40 individuals are measured and the sample mean x is determined. What is the computed value at a = 0.01 if x = 147? 2. The maximum heart rate of a person at the age of 20 is 200 beats per minute. Conduct a survey with your neighbors whose age is between 15- 20. Collect a data of 10 samples, then compute its value for a = 0.01?
Answers
Given : the cholesterol levels in a certain population have mean = 150 and standard deviation = 12.
The cholesterol levels for a random sample of n = 40 individuals are measured and the sample mean x is determined.
To Find : the computed value at a = 0.01 if x = 147
Solution:
standard deviation = 12.
sample of n = 40
SE = Standard Error = SD/√n = 12/√40 = 1.897
a = 0.01 => 99 % confidence interval hence z = ± 2.575
147 ± 4.8857
computed value
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