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A sample consisting of four pieces of luggage was selected from amoung those checked at an airline counter, yeilding the following data on x=weight (in pounds): x 1 33.5, x2 27.3, x3 36.7, x4 30.5 Suppose that one more piece is selected; denote its weight by x5. Find a value of x5 such that X = smaple median.
A University employment office wants to compare the time taken by graduates with 3 different majors to find their first jobs after graduation.
Is there a difference in the number of points students earned on their educational statistics pretests and posttests?
A large population of metal rods have an average diameter of .943 inches with a standard deviation of .001 inches. The engineering specification for the rods requires that they be between .941 and .944 inches.
You are thinking of employing a t-procedure to test hypotheses about the mean of a population using a significance level of 0.05.
Find the margin of error in estimating the population mean: confidence level = 94%; sample size=86; sample mean = 113.5; and standard deviation = 12.7.
How large a sample must one take to be 90% confident that the estimate is within 0.05 of the true proportion of women over 55 who are widows?
Construct the payoff table for this decision situation. Compute the expected value of each alternative amount of milk that could be stocked, and select the best decision.
The probability distribution of a random variable X is shown below, where X represents the amount of money (in $1,000s) gained or lost in a particular game of Blackjack.
The amount of money spent by a customer is uniformly distributed over (0,100). Find the mean and variance of the amount of money that the store takes on a given day.
Compare the actual results to those expected from the Poisson probabilities. Explain, how you do the comparison. Does the Poisson distribution serve as a good device for predicting the actual results?
Find the value of k. Find the cdf of X. Find the mean and the variance of X.
Random sample of 100 people yielded following data on number of tissues utilized in a cold: x-bar = 38, s = 20. By using sample information provided, compute the value of test statistic for the relevant hypothesis test.
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