A random sample of nine telephone calls in an office provided the following information. Call Number Duration (In Minutes) Type of Call 1 3 local 2 8 long distance 3 4 local 4 3 local 5 5 long distance 6 6 local 7 3 local 8 5 local 9 8 local
a. Determine the point estimate for the average duration of all calls.
b. What is the point estimate for the standard deviation of the population?
c. Determine the standard error of the mean.
d. What is the point estimate for the proportion of all calls that were long distance?
e. Determine the standard error of proportion.
a. 5
b. 2
c. 0.67
d. 0.222
e. 0.138
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If the covariance between two investments of a portfolio is zero, the variance of the portfolio will be equal to the sum of the variances of the investments
Indicate whether the statement is true or false