Reject Ho. At an alpha level of 5% and a p-value of less than 1%, we have sufficient evidence to conclude that the mean speed in mph for all cars driving through this construction zone is greater than 25 mph. Poisoning by the pesticide DDT causes convulsions in humans and other mammals. Researchers seek to understand how the convulsions are caused. In a randomized comparative experiment, they compared 6 white rats poisoned with DDT with a control group of 6 un-poisoned rats. Electrical measurements of nerve activity are the main clue to the nature of DDT poisoning. When a nerve is stimulated, its electrical response shows a sharp spike followed by a much smaller second spike. The researchers measured the height of the second spike as a percent of the first spike when a nerve in a rat’s leg was stimulated. For the poisoned rats, the results were 12.207 16.869 25.050 22.429 8.456 20.579 The control group data were: 11.074 9.686 12.064 9.351 8.182 6.642 Do data provide convincing evidence that DDT affects the mean relative height of the second spike’s electrical response? Ho: (poisoned) = (control) Ha: (poisoned) (control)
Reject Ho. At an alpha level of 5% and a p-value of less than 1%, we have sufficient evidence to conclude that the mean speed in mph for all cars driving through this construction zone is greater than 25 mph. Poisoning by the pesticide DDT causes convulsions in humans and other mammals. Researchers seek to understand how the convulsions are caused. In a randomized comparative experiment, they compared 6 white rats poisoned with DDT with a control group of 6 un-poisoned rats. Electrical measurements of nerve activity are the main clue to the nature of DDT poisoning. When a nerve is stimulated, its electrical response shows a sharp spike followed by a much smaller second spike. The researchers measured the height of the second spike as a percent of the first spike when a nerve in a rat’s leg was stimulated. For the poisoned rats, the results were 12.207 16.869 25.050 22.429 8.456 20.579 The control group data were: 11.074 9.686 12.064 9.351 8.182 6.642 Do data provide convincing evidence that DDT affects the mean relative height of the second spike’s electrical response? Ho: (poisoned) = (control) Ha: (poisoned) (control)
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