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  3. solve problem #1 by hand using the 7-step method.

Solve problem #1 by hand using the 7-step method. To receive full credit, show all hand...

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Statistics

Solve problem #1 by hand using the 7-step method. Toreceive full credit, show all hand calculations.

1. Rats who grow up in an uncrowded environment (1 ratper cage) live a mean number of 38 months.
A psychologist wants to know the effect of crowding on lifeexpectancy of rats. A group of 31 rats
are raised in crowded conditions (3 rats per cage) and their age atthe time of their natural death is recorded.

The data are: 43 39 38 37 36 39 35 36 40 40 41 36 3839 41 39
           41 40 37 35 38 38 39 37 43 39 37 38 40 39 32

a) Use the 7 step method at = .05 to test thepsychologist's prediction.

Answer & Explanation Solved by verified expert
3.6 Ratings (265 Votes)
Step 1 Null hypothesis states that the mean life of rats whogrow up in croweded conditions is 38 monthsHo Step 2 Alternative hypothesis states taht the mean life of ratsis not 38 monthsHa Step 3 Level of significance 005Step 4 Sample datasample mean sum of all terms no of    See Answer
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