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A person estimates that his commute to work will most likely take 50 minutes. However, it could talk as long as 1 hour and 35 minutes worst case, or as little as 35 minutes best case. What is the approximate standard deviation based on the above estimates? a.70 minutes b.60 minutes c.15 minutes d.10 minutes
Which of the following may be considered a variable
A typical incoming telephone call to your catalog sales force results in a mean order of $ 28.63 with a standard deviation of $ 13.91. You may assume that orders are received independently of one another.
Is the random variable discrete or continuous?
Determine whether this data already provides an expected relative error introduced by the simulation of below 5%. If not, compute how many new simulations you should run in order to reduce the expected relative error introduced by the simulation b..
Let X1....X10 be a random sample from a population with mean 50 and standard deviation 4. Let X be the sample mean. Find the expected value and standard deviation of X. Do you know the probability distribution of X ? Clearly state any neces..
Perform a hypothesis test to address the questions
Produce boxplots to compare the selection times for each participant. Comment on what they reveal. Also identify (by initial) which participant took the longest and which took the shortest time to make their decisions.
What is the conditional probability that a student likes gospel music if we know that he or she likes country music?
Mall security estimates that the average daily per-store theft is no more than $250, but wants to determine the accuracy of this statistic. The company researcher takes a sample of 64 clerks and finds that =$252 and s = $10.
What is the critical value for the test statistic?
How many standard deviations away from the mean is her age?
What is the correlation between pre-test scores and post-test scores? Assuming the obvious directional hypothesis (i.e., that those who score highly at pre-test tend to score highly at post-test), is the correlation statistically significant?
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