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The stimulant Ritalin has been shown to increase attention span and improve academic performance in children with ADHD (Evans, Pelham, Smith, et al., 2001). To demonstrate the effectiveness of the drug, a researcher selects a sample of n = 25 children diagnosed with the disorder and measure each child's attention span before and after taking the drug. The data show an average increase of attention span of M_D = 6.8 minutes with a standard deviation of s = 5.5.
a. Is this result sufficient to conclude that Ritalin has a significant effect on attention span? Use a two-tailed test with ∝ = .01.
b. Compute r^2 and estimate Cohen's d to measure the effect size of the drug.
Estimate the probability that the machine will overflow an 8 oz cup.
Assume the population standard deviation is 1.2 hours. The standard error of the mean is:
Students are the University of New Harmony received 10, 000 course grades last semester. The table below breaks down these grades by which school of the university taught the course.
Compute the skewness for your data set using Pearson's
Suppose that population has normal distribution. Determine a 95 percent confidence interval for population standard deviation sigma.
A certain random experiment can result in one of four different possible outcomes, which we'll call A, B, C and D.
At the 5% level of significance, can we infer that branch A has a significantly higher proportion of satisfied customers than branch B?
In the Distance problems, the kids are given a Rate (speed) that a vehicle is going, as well as a Time that the vehicle travels, and asked to calculate the Distance travelled. In the Rate problems they are asked to compute Rate from the other two ..
Compute the effect size with gender as the grouping variable and ADDSC as the dependent variable.
The New York Times reported (L.J> Flynn, Tax Surfing, The New York Times, March 25, 2002, p. C10) that the mean time to download the home page for the internal Revenue Service (IRS) , was 0.8 second. Suppose that the download time was normally di..
Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times?
Describe the standard normal distribution. Explain why it can be used to find probabilities for all normal distributions.
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