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. a. You will be using a independent-measures t-test because (list all reasons) b. The null hypothesis in words is c. The alternative hypothesis in symbols is

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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Author:Carter
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Chapter10: Statistics
Section10.6: Summarizing Categorical Data
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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.

a. You will be using a independent-measures t-test because (list all reasons)

b. The null hypothesis in words is
c. The alternative hypothesis in symbols is
 
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