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Question: 1. Write sentences that distinguish between a statistically significant difference and an important difference.
2. Problem revealed that there was no significant loss in the memory of rats that had 20 percent of their cortex removed. Calculate the effect size index and write an interpretation that incorporates both the effect size index and the t test
Problem: Karl Lashley (1890-1958) studied how the brain stores memories. In one experiment, rats learned a simple maze. Afterward, they were anesthetized and for half the rats, 20 percent of the cortex of the brain was removed. For the other half, no brain tissue was removed (a sham operation). The rats recovered and learned a maze. The number of errors was recorded. Name the independent variable, its levels, and the dependent variable. Analyze the data in the table and write a conclusion about the effect of a 20 percent loss of cortex on retention of memory for a simple maze.
Percent of context removed
0 20
∑X 208 252
∑X2 1706 2212
N 40 40
fine motor skills were measured in a sample of kindergarteners before and after 6 months of occupational therapy.
A safety engineer is concerned that the four motors might not be powerful enough to properly operate the crane. Stating any additional assumptions you are using, does the engineer's concern appear to be justified?
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Find a website related to your major that summarizes data and uses graphs, and share it with the class - Netiquette Guidelines listed in Getting Started module
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Let {N1(t),t ≥ 0} and {N2(t),t ≥ 0} be two independent Poisson processes, with rates λ1 and λ2, respectively. We defineN(t) = N1(t) - N2(t). (a) Explain why the stochastic process {N(t) t ≥ 0} is not a Poisson process.
A program was developed to improve nutrition among low-income residents in New York City. This program was evaluated by comparing NYC residents who were randomly assigned to the intervention group vs. residents assigned to the control group. The..
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