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Consider a random variable X for which Pr( X> 0) = 1. It is said that X has a lognormal distribution if the random variable log X has a normal distribution. Suppose that X has a lognormal distribution and that £(log X) = P and Var (log X) = 02. Determine the p.d.1. of X.
Two independent samples of a random variable X are taken. - Determine the expected value and variance of the sample mean.
The Rovers have a 0.55 probability of winning a game with the Sailors, and the Sailors have a 0.45 probability of winning a game with the Rovers. Find the probability that only six games are needed for Rovers to win the series. How many games shou..
A scientist believes that a population mean is exceeding to 250. He decides to take a random sample of 100 measurements. The sample comes out to be 259 and Standard Deviation is 40. The value of α= 0.05. Construct a null and alternative hypothesis
please compute the range sample variance and sample standard deviation phone bill using these numberssix randomly
In each part, identify whether the sample is a stratified random sample or a cluster sample.- A class of 200 students is seated in 10 rows of 20 students per row. Three students are randomly selected from every row.
The mean age of adult learners in a chosen class of 31 students is 33.8 years. The standard deviation is equal to 7 years.
Using the six-step critical value approach, at the 0.05 level of significance, is there evidence that the population mean delivery time has been reduced below the previous population mean value of 25 minutes?
What is correlation? How is correlation used to understand the relationship between two variables? What is the difference between positive and negative (inverse) correlation?
the results of a recent poll on the preference of voters regarding the presidential candidates are shown below. voters
Why would you expect this confidence interval to be substantially longer than the confidence interval based on a one-step Mestimator?
Construct and interpret a 90% confidence interval for the mean angle of deformity in the population of all such patients.
for a certain musician his favorite brand of guitar picks is far more likely to chip accidentally and become useless
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