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Aim

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Pretest

Simulation

Assignment

References

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Mean and Covariance

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1. Calculate the mean of the following data. 0.9501, 0.2311, 0.6068, 0.4860, 0.8913, 0.7621, 0.4565, 0.0185, 0.8214, 0.4447

a: 0.5669 Explanation

Explanation

b: 0.6669 Explanation

Explanation

c: 0.4669 Explanation

Explanation

d: 0.5649 Explanation

Explanation

2. What is the variance of the above data?

a: 0.8930 Explanation

Explanation

b: 0.0983 Explanation

Explanation

c: 0.0893 Explanation

Explanation

d: 0.7813 Explanation

Explanation

3. Calculate the mean of the X

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a: [4.10 2.08 0.604] Explanation

Explanation

b: [4.10 0.604 2.08] Explanation

Explanation

c: [2.08 0.604 4.10] Explanation

Explanation

d: [20.5 10.4 3.02] Explanation

Explanation

4. Which best describes how the data in Scatter Diagram #2 differ from the data in following Scatter Diagram

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a: The mean of y2 is smaller than the mean of y1 Explanation

Explanation

b: The range of x2 is smaller than the range of x1 Explanation

Explanation

c: The variance of y2 is smaller than the variance of y1 Explanation

Explanation

d: The variables y2 and x2 have a stronger horizontal relationship than y1 and x1 Explanation

Explanation

e: Don't know Explanation

Explanation

5. Suppose that within a very large corporation salaries are positively skewed with a mean of 40,000 dollars and a standard deviation of 20,000 dollars. Which statement is true for a sample of workers?

a: At least 68.3 percent of workers have a salary between 20,000 dollars and 60,000 dollars Explanation

Explanation

b: At least 75.0 percent of workers have a salary between 20,000 dollars and 60,000 dollars Explanation

Explanation

c: At least 88.9 percent of workers have a salary below 100,000 dollars Explanation

Explanation

d: At least 95.4 percent of workers have a salary below 100,000 dollars Explanation

Explanation

e: Don't know Explanation

Explanation

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