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The time at which a bus arrives at a station is uniform over an interval (a, b) with mean 2:00 PM. and standard deviation IE minutes. Determine the values of a and b.
u.s. bureau of the census data reveal the largest town in the state of oh has a population of one million families. the
a researcher was interested in determining the effect of an experimental drug on the lifespan of laboratory rats.
The file called Welco contains a random sample of logs of various diameters and the potential value of the finished products that could be developed.
usually statisticians use an alpha level of either 0.01 or 0.05 or 0.10. describe what a statistician is trying to
The heights of adults in one town have a mean of 66.3 inches and a standard deviation of 3.3 inches. What can you conclude from Chebychev's theorem about the percentage of adults in the town whose heights are between 59.7 and 72.9 inches..
At the 0.05 level of significance, is there evidence that the average purchase is different from 10 liters? At the 0.05 level of significance, is there evidence that less than 20% of the motorists purchase super unleaded gasoline?
1 two events cannot be both independent and mutually exclusive. t or f2 the probability that event a and event b will
Suppose that 30% of the population has black hair. In a randomly-selected group of six people, how probable is it that
Two independent samples of sizes n1 = 50 and n2 = 50 are randomly selected from two populations to test the difference between the population means. The sampling distribution of the sample mean difference, is:
A sample of size 36 results in a sample mean of 7.1. The value of the test statistic is ____
Find the ace. A new electronics store holds a contest to attract shoppers. Once an hour someone in the store is chosen at random to play the Music Game.
Q. An owner of a chain of stores would like to predict weekly sales based on the number of customers who made a purchase. A random sample of 10 stores were selected. The weekly sales are in thousands of dollars.
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