1. For a simple random sample of 50 employees with poppulation standard deviatio
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Question
1. For a simple random sample of 50 employees with poppulation standard deviation of 20 & the average salary of $50,000. (A) What is the probability for those who make more than $55,000? (B) What is the probaility for those who make in between $48,000 & $53,000?
2. A population of 250 has the mean of 25 with standard deviation of 10. For a sample size of 50, what is the standard error of the sample mean?
3. Out of 500 employees of Steve Company, 190 of them participate in carpool. What is the population proportion?
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Explanation / Answer
Q2.
Mean ( u ) =25
Standard error ( se )= 10/ Sqrt(n) = 1.4142
Number ( n ) = 50
Q3.
No. them participate in carpool(x)=190
Sample Size(n)=500
Sample proportion = x/n =0.38
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