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Exponential Lifetimes.
A lifetime X (in years) of a particular device is modeled by an exponential distribution With unknown rate parameter 9. The lifetimes of X1 : 5, X2 : 6, and X3 : 4 are observed. Assume that an expert familiar with this type of devices suggested that 9 has exponential distribution with mean 3. (a) For the prior suggested by the expert, ?nd the posterior. (b) What are the mean and variance of the posterior.
Construct a cross-tabulation describing the cities, using grade on financial management and grade on information technology as the categorization variables.
What are the differences between the Federal deficit and Federal Debt?
a city ballot includes a local initiative that would legalize gambling. the issue is hotly contested and two groups
The company offers a warranty. The warranty costs $8 per tire returned. If the company sets the warranty miles at 67000, how much on average per tire will the warranty cost?
The Wall Street Journal reported that long term Treasury bonds had a mean return of 24.03% in 2008. Assume that the returns for the long term Treasury bonds were distributed as a normal random variable, with a mean of 24.03 and a standard deviatio..
the mean price to buy two of the medicines was 267.00 in 2006. a random sample of discount prices gives the following
How many five-card hands chosen from a standard deck of playing cards consist of five cards in a row.
A sample of 20 is taken, resulting in a mean of 16.45 and standard deviation of 3.59. Assume that x is normally distributed and used alpha of 0.5 to test hypotheses.
Two cards are drawn at random and without replaement froma deck of 52 cards. Show rigorously that the probablility that the second card is a Jack is 4/52.
Use the Wilcoxon rank-sum test to determine whether there is any evidence to suggest a difference in the concentration of naphthalene in the sediment.
if y has a normal distribution with a mean of 32 and a standard deviation of 12 and you take samples of size 9 the
Then test to see whether it considerably varies from 0 [use alpha = 5%]. Don't forget to identify the null and alternative hypotheses.
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