statistics problem 5

—–Original copy is attached—

1.The Always Run battery company advertises that its battery lasts longer than batteries made by other companies.We randomly select five batteries from the latest production run of this company and five batteries from three other battery companies.We test the life of each of the batteries in a standard flashlight.The number of minutes that each battery lasted in presented below.

Always Run	Company A	Company B	Company C
98	94	90	92
92	90	93	86
98	88	92	87
97	88	87	93
94	92	89	92

Are there differences in the lives of the batteries from the 4 companies?

2.The A-Z pharmaceutical company has developed a new anti-anxiety drug (anxiolytic) Feelssogood.To test its effectiveness on anxiety versus 4 other common anxiolytics (Valium, Xanax, Buspar, and Lorazepam), 20 rats were randomly assigned to one of the five drug conditions and placed in an elevated plus maze.The maze has two “open arms” and two “closed arms.”Since rats are nocturnal animals, and generally avoid lighted areas, it is thought that anxiety-reducing drugs reduce the fear of exploring the “open arms.”The amount of time spent in the open arms per 15 minute test session after administration of each of the drugs is presented below.

Drug
Feelssogood	Valium	Xanax	Buspar	Lorazepam
2	4	7	5	4
3	7	7	4	5
6	9	12	7	9
2	3	6	2	3

Are the drugs different in their effectiveness in reducing anxiety at the .05 level?

 

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