Mathematics, 22.06.2019 23:50 xojade

# The stimulant ritalin has been shown to increase attention span and improve academic performance in children with adhd (evans et al., 2001). to demonstrate the effectiveness of the drug, a researcher selects a sample of n = 20 children diagnosed with the disorder and measures each child's attention span before and after taking the drug. the data show an average increase of attention span of mr = 4.8 minutes with a variance of52 125 for the sample of difference scores. a. is this result sufficient to conclude that ritalin significantly improves attention span? use a one- tailed test with α .05. compute the 80% confidence interval for the mean change in attention span for the population.

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Mathematics, 21.06.2019 12:30

Are carpet coast $15 per square metre. the total delivery charge is $21 peter buys n squared metres of carpet what is the expression which represents the total cost in $

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Mathematics, 21.06.2019 12:40

Points d and e are midpoints of the sides of triangle abc. the perimeter of the triangle is 48 units. what is the value of t? ο ο ο ο 7t +

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Mathematics, 21.06.2019 16:00

()1. how do you find range? 2.the following set of data is to be organized into a histogram. if there are to be five intervals on the graph, what should the length of each interval be? 30, 34, 23, 21, 27, 25, 29, 29, 25, 23, 32, 31

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Mathematics, 21.06.2019 17:00

Answer all of the parts of the question! for the last part there are two choices which are the (same/different) make sure to tell me which one!

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The stimulant ritalin has been shown to increase attention span and improve academic performance in...

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