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The following frequency distribution reports the electricity cost for a sample of 50 twobedroom apartments in Albuquerque, New Mexico during the month of May last year.
a. Estimate the mean cost.b. Estimate the standard deviation.c. Use the Empirical Rule to estimate the proportion of costs within two standard deviations of the mean. What are these limits?
What statement can you made by using the rule of three, about the proportion p, of all its computers which are defective?
At the end of the training program, the attitude of each trainee was measured on a 100-pt. scale (the lower the score, the poorer the attitude). How many treatments are in this experiment?
Averaging 204 pins with a standard deviation of 24.9, can one conclude at a level of significance of .01 that the new ball has improved his game?
What is the probability that the next customer will request extra unleaded gas and fill the tank (A union B)?
Find the distance between each pair of points. If necessary round answers to two decimal places. Find the midpoint of each line segment with the given endpoints.
N = 500 is to be selected from the population. What is the probability that the sample proportion, will be within ± 3 percentage points of the true p, i.e., Pr{0.42 ≤ ≤ 0.48}?
Determine the covariance matrix for values of this process at time t=1,2,3,4. Determine its inverse(numerically) and write formula for pdf of corresponding random vector.
While 290 out of 400 in Batavia preferred the same flavor. To test the hypothesis that there was no difference in preferences in the two towns, what is the alternate hypothesis?
The pooled variance of two samples is:
You find that a random sample of five microwave ovens has a mean repair cost of $75 and a standard deviation of $12.50. At α = 0.01, do you have enough evidence to support the repairer's claim?
A portfolio p of consisting 60% of stock X and 40% of stock Y, has a correlation ρpM = 0.62 with the market. What is the portfolio volatility? Statement on the diversification effect.
Following sample data shows the weekly closing price of ABC stock. Compute the sample mean and variance from this data set.
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