Find a sufficient statistic for variance
How do you find a sufficient statistic for variance from one observation obtained from normal distribution of mean 0?
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Let X be random variable having exponential distribution with mean 1. Employ the method of cumulative distribution function (CDF) to find out the probability density function of random variable Y=2e-X. Determine the distribution of Y (that is, give
Based upon past experience, it is supposed that the number of flaws per foot in rolls of grade 2 paper follows poisson distribution with mean of 1 flaw per 10 feet of paper (.1 flaw per foot).
What are the mean and standard deviation of the number of on-time arrivals? Let n=6 The standard deviation of the number of on-time arrivals is?
The increase or decrease in the price of a stock between the beginning and the end of a trading day is supposed to be equally likely random event. Determine the probability that the stock will show an increase in its closing price on five consecut
Each year, ratings are compiled regarding the performance of new cars during the first 90 days of use. Assume that the cars have been categorized according to whether car needs warranty related repair (yes or no) and country in which the company m
The increase or decrease in price of stock between the beginning and end of trading day is supposed to be equally likely random event. Determine the probability that the stock will show an raise in its closing price on five consecutive days?
A refrigerator manugacturer claims that mean life of its refrigerators is greater than 13 years. You are asked to perform a hypothesis test to test the claim.
In a certain company the following information is available upon salary of male and female employees:
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