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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.
Evaluate the difference in the mean ratings and find the standard deviation of the difference in the ratings, what is the chance both children are boys?
Calculate a 3-month moving average forecast for months 4 through 9 also Compare the two forecasts by utilizing MAD. Which forecast appears to be more accurate.
what is the chance the average contents of the cans will be less than advertised and what will be the standard deviation of the number of men who help at home, based on the first survey
Events A and B are mutually exclusive events defined on common sample space. If P (A) 0.5 and P (A or B) = 0.70, determine P (B).
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location. Research question: At α = . 05, does vehicle type vary by mall location?
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
Would it be reasonable to conclude that the population mean is 63 pounds?
To find out the test statistics utilizing chi square method. A professional bowler has been having trouble 'hitting the pocket' in order to get strikes.
Here are fifty observations on the weight of tea bags. Calculate the Standard Deviation and Variance.
Develop a mathematical programming model and solve. Discuss your results [total profits, total costs, etc].
Mean and standard deviation are 584.6 and 34.28
Forecast the number of deliveries utilizing exponential smoothing constant for different values also compare it. A hospital records the number of floral deliveries its patients receive every day.
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