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Using the notation of this section, let U be the number of observed values of X in the smallest d items of the combined sample of m + n items.
Argue that
Pr (U = u) = ( )(d:u)/( m ;"). u = 0, 1, . . . , m.
The statistic U could be used to test the equality of the (lOOp)th percentiles, where (m + n)p = d, of the distributions of X and Y.
Construct a 95% confidence interval for the true average amount of time customers spent in the restaurant. With a .95 probability, how large of a sample would have to be taken to provide a margin of error of 2.5 minutes or less?
Find the probability that out of our batch of 100, with the sampling technique listed above, that (i) both toothbrushes are defective, (ii) that one of the two is defective.
Hypothesis Testing
Use MegaStat's output for simple linear regression to determine the regression equation
A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?
If the population standard deviation is σ = 20 is the 6 point effect large enough to be statistically significant? Use the two - tailed test with α = .05
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Calculate the difference scores and find MD for the following data from a repeated-measures study. The data below are from an independent-measures experiment comparing three different treatment conditions.
two hundred single sport athletes were cross-classified according to gender as
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