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# STA215 H5F - Introduction To Applied Statistics - Statistics Assignment Help

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###### STA215 H5F: Introduction To Applied Statistics- Statistics Assignment Help

A research neurologist wishes to test the e?ect of a new drug on response time. She randomly selects 100 rats, injects each rat with one unit of the drug, and then subjects each rat to a neurological stimulus. The response time (time to react to the stimulus) of each rat, in seconds, is recorded. It is known that mean response time for rats not injected with any drug (control group) is 1.2 seconds. The neurologist is interested in determining if the drug is e?ective. Use a signi?cance level of 5%. The data is attached in the ?le “DrugRat.csv”.

1) Open RStudio and read in the data from the csv ?le. Rename the variable to include your family/last name:
> yourfamilyname_RatResponseTime <- RatResponseTime

2) Make a histogram and a boxplot of the response times. Also obtain summary statistics. Hand In: Copy and paste the R commands, and their outputs.

3) Use the z.test function to conduct the hypothesis test that is appropriate to test the neurologist’s question of interest.
The z.test function is in the TeachingDemos package - download and install the package if you don’t already have it. The z.test function has the following format:
z.test(x, mu, sigma, alternative, conf.level)
where x = data values mu = hypothesized value of the population mean sd = population standard deviation (if known) or use sample standard deviation alternative = direction of the alternative hypothesis: either “two.sided”, “greater’, or “less” conf.level = con?dence coe?cient (expressed as a number between 0 and 1)
You should enter in the parameter values that are appropriate for the hypothesis test of interest.

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• Uploaded By : Koby Mahon
• Posted on : November 21st, 2018

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