A researcher conducts an independent-measures study to examine how the brain chemical serotonin is related to aggression.  One sample of rats serves as a control group and receives a placebo that does not affect normal levels of serotonin.  A second sample of rats, low serotonin group, receives a drug that lowers brain levels of serotonin.  Then, the researcher tests the animals by recording the number of aggressive responses each of the rats display.  See the data below. Is there a significant difference between the control group and the low serotonin group regarding the number of aggressive responses?                                                Control         Low Serotonin                                                    n = 10                 n = 15                                                M = 14               M = 19                                                SS = 180.5         SS = 130 Perform a hypothesis test using independent-measures t-test. Use a two-tailed test with α = .05, and answer the following questions. You will be using a independent-measures t-test because  Select all the correct answers You are using data from a single sample You know the population mean, but not the population standard deviation You know the population standard deviation, but not the population mean You do not know the population mean and population standard deviation you can use either independent-measures or repeated-measures t test You are comparing the means of two different samples

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
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Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 10CYU
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A researcher conducts an independent-measures study to examine how the brain chemical serotonin is related to aggression.  One sample of rats serves as a control group and receives a placebo that does not affect normal levels of serotonin.  A second sample of rats, low serotonin group, receives a drug that lowers brain levels of serotonin.  Then, the researcher tests the animals by recording the number of aggressive responses each of the rats display.  See the data below. Is there a significant difference between the control group and the low serotonin group regarding the number of aggressive responses?

                                               Control         Low Serotonin  

                                                 n = 10                 n = 15

                                               M = 14               M = 19

                                               SS = 180.5         SS = 130

Perform a hypothesis test using independent-measures t-test. Use a two-tailed test with α = .05, and answer the following questions.

You will be using a independent-measures t-test because 

Select all the correct answers

You are using data from a single sample
You know the population mean, but not the population standard deviation
You know the population standard deviation, but not the population mean
You do not know the population mean and population standard deviation
you can use either independent-measures or repeated-measures t test
You are comparing the means of two different samples
 


 
 
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