A balanced experiment requires that

A. an equal number of persons or test units receives each treatment.

B. the number of treatments equals the number of samples.

C. at least one sample equal size is 30.

D. at least two treatment groups be used.

87.12-83.42 what is the difference

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Elisas mom teaches at a preschool. there is 1 teacher for every 12 students at the preschool. there are 276 students at the preschool. elisa is setting up equivalent ratios to find the number of teachers at the preschool.

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In a group of 21 students, 8 students take Art courses, 7 students take Music courses. Two students take both courses. A student is chosen randomly from this group. What is the probability that the student takes either Art or Music courses? 57

5% of what number is 63?

Find the sum of the "n" terms of the series: Sn=1²+3²+5² + ... + (2n-1) ²