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1. Consider a gambler who on each bet either wins 1 with probability 18/38 or loses 1 with probability 20/38. (These are the probabilities if the bet is that a roulette wheel will land on a speci?ed color.) The gambler will quit either when he or she is winning a total of 5 or after 100 plays. What is the probability he or she plays exactly 15 times?
2. Show that
(a) E[XY|Y = y]= yE[X|Y = y]
(b) E[g(X, Y)|Y = y]= E[g(X, y)|Y = y]
(c) E[XY]= E[YE[X|Y]]
Assume that the weights of coconuts are normally distributed with a mean weight of 17.6 pounds and a standard deviation of 1.2 pounds.
question 1 as part of his review for a chemistry test a student randomly selects without replacement 40 out of 102
Draw a back-to-back stem-and-leaf plot, with drug users on the right and discuss similarities and differences between the two data sets. There should be three things you look at when comparing these - location, variation, and general shape.
for a random sample of 50 measurements on the breaking strength of cotton threads the mean breaking strength was found
Make a worksheet in Excel for your calculations. (b) Make a histogram of the data. Would you be justified in using a parametric t test that assumes normality? Explain.
Discuss the characteristics of a good research hypothesis. What distinguishes a null hypothesis from a research hypothesis? How would you explain the difference between non-directional research and directional research hypothesis?
short term versus long runshort-term aberrations do not affect the long run. to illustrate suppose that you flip a coin
Market researchers would like to know if customers prefer a well-known brand over a generic brand of soft drink. They give a large sample of people the two drinks to taste in a random order and ask them which one tastes better.
using a source of international statistics oecd imf or their respective central banks statistical database compare the
A foreman for a firm admits that on 10% of his shifts he forgets to shut off the machine. This causes the machine to overheat and the probability that a defective mold will be produced during the early morning run increases from 2% to 20%.
Give a possible description why serum cholesterol values for older males are lower than for younger males and reverse is true for females.
Roll a die and record the count of spots on the up face: P(1) = 0, P(2) = 1/6, P(3) = 1/3, P(4) = 1/3, P(5) = 1/6, P(6) = 0.
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