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1. The statistician Piggy has to wait an amount of time T0 at the post office on an occasion when she is in a great hurry. In order to investigate whether or not chance makes her wait particularly long when she is in a hurry, she checks how many visits she makes to the post office until she has to wait longer than the first time. Formally, let T1, T2, . . . be the successive waiting times and N be the number of times until some Tk > T0, that is, {N = k} = {Tj ≤ T0, 1 ≤ j k, Tk > T0}. What is the distribution of N under the assumption that {Tn, n ≥ 0} are i.i.d. continuous random variables? What can be said about E N ?
2. Let X1, X2, . . . , Xn be independent, continuous random variables with common distribution function F(x), and consider the order statistic (X(1), X(2), . . . , X(n)). Compute E(F (X(n)) - F (X(1))).
A consumer survey indicates that the average household spends m=$155 on groceries each week. The distribution of spending amounts is normal with a standard deviation of o=$25. Based on this distribution
4 prizes of $350, & 1 prize of $1000. Assume that 15,000 lottery tickets are issued and sold for $1.00. What is the lottery's expected profit per ticket?
1. you are trying to determine the average age of students at cuyamaca college. the average age of 50 randomly selected
Use a graphical technique to compare the ages, household incomes, and education of the five groups of car buyers. (Do not use Box plots or Stem-and-Leaf Display).
Blockbuster is testing a new policy of waiving all late fees on DVD rentals using a sample of 10 randomly chosen customers.
Find values for the mean and variance of X. Using a distribution approximation, calculate the probability that there are more than 10 faulty disks in a box of 500 disks.
On a particular day during the most recent golf tournament, the organizer placed the whole (pin) in 0 back left corner of the green. 64 golfers played the hole with the new placement on that day. Find out the probability of the sample average numb..
a business person looking at data wonders does the average price for medium fuel in the united states differ
a group of researchers studied the effect of global environmental change on grazing lands. their article reported the
The records of a casualty insurance company show that, in the past, its clients have had a mean of 1.8 auto accidents per day with a variance of 0.0016.
A certain component is critical to the operation of medical device and must be replaced immediately upon failure. If the mean lifetime of this type of component is 100 hours and its standard deviation is 30 hours, how many of these components must..
For this same sample of n = 45, find out the width of confidence interval around population mean? Illustrate all work.
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