Three high schools participated in a study to evaluate the effectiveness of a new computerbased mathematics currk'ulum. in each school, four 24-student sections of freshman algebra were available f9r the study. the two types of instruction (standard c'urriculum, computerbased curriculum) were randomly assigned to the four sections in each of the three schools. at the end of the term, a standard mathematics achievement test was given to each of the 24 students in each section. a. is this study experimental, observational, or mixed experimental and observational? why? b. identify all factors, factor levels, and factor-level combinations. c. what type of study design is being implemented here? d. what is the basic unit of study?

a. -0.3 > -0.33

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

asdsad

step-by-step explanation:

47.28 or 47.2857143

step-by-step explanation:

you just divide 331 by 7 and you get that answer. ( i think so tho)