An experiment was conducted to help determine if giving caffeine to rats affecte

Question

An experiment was conducted to help determine if giving caffeine to rats affected their sleep. The three treatments were a control, a low caffeine dose of 1 mg/ml of blood, a medium dose of 3 mg/ml of blood, and a higher caffeine dose of 5 mg/ml of blood. Twelve rats were assigned at random to the four treatments, three to each treatment, and the minutes of sleep measured over a 24-hour period was recorded. The data follow.

The Mean Square(MS) for error is

11976

538.75

4

It can not be determined

Treatment Minutes of sleep

Explanation / Answer

Ans:

SSE=SST-SSTR

MSE=SSE/dfd=4309.978/8=538.75

ANOVA Table:

Hence,538.75 is the correct answer.

Treatments Sleep times Mean std dev. 1 450 413 418 427 20.075 2 466 422 435 441 22.605 3 421 453 419 431 19.079 4 364 330 389 361 29.614

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