Question: Andrew wanted to find the optimum conditions for his chickens to lay eggs. He divided his 20 chickens into 2 groups, X and Y, and recorded their daily care (amount of chicken feed and calcium) and egg production for 2 weeks. Did Andrew do a good job of controlling the variables in his experiment? Explain why or why not.
Reference answer: No. Andrew changed 2 variables at the same time (amount of chicken feed and the amount of calcium) so Andrew can not know which variables made a difference.

Student answer: No, Because he changed 2 variables, food and calcium.

Student answer: No, Because he needs to change one thing only so keep the food or calcium the same. Only change one thing.

Student answer: No, He did not do a good job because he changed more than one variable.

Student answer: No, He change more than one variable which make it not a controlled environment.

Student answer: No, He changed 2 factors.

Student answer: No, Andrew did not do a good job on controlling his variables because he did not take care of all of the fairly evenly for his variables. He had more than one variable.

Student answer: No, No, he did not only use one variable, he used 2.

Student answer: No, He did not because he gave different amounts of food and calcium, so it made a different for the chickens to lay eggs.

Student answer: No, He gave group y more food and calcium.

Student answer: Yes, because he had a lot of egg.

Student answer: No, He did not did a good because he did not gave the same amount of grams and the right calcium for the group.

Student answer: No, No because he did not control all variables accept for one, he changed all the variables accept for one.

Student answer: Yes, Because it was controlled because there were 10 chickens in each group.

Student answer: Yes, why because he maybe wanted to see the difference of the 2 chickens.

Student answer: No, I think he did not do a good job because he should not had the same daily care.

Student answer: No, No because he changed more than one variable.

Student answer: Yes, because he did a graph and did grams for calcium for group one and chicken feed for group.

Student answer: Yes, It was all organized and neat.

Student answer: Yes, Yes because he did a good graph.

Student answer: Yes, well he did quite feed them good.

Student answer: No, Because he did not feed the chickens the same grams.

Student answer: Yes, because he wrote everything down.

Student answer: Yes, Yes he recorded everything he did everyday.

Student answer: No, because he is only supposed to change only one thing in his experiment.

Student answer: Yes, Yes because he has all the stuff recorded right.

Student answer: Yes, because he only changed one variable.

Student answer: No, No he could have done it for a longer time of period.

Student answer: No, Well, he did do a good job controlling the variables, but he needs to control one chicken at a time to get better results.

Student answer: Yes, because he organized it so you can see what he did.

Student answer: No, No, because he can only control one variable at a time.

Student answer: No, He changed more than one variable.

Student answer: Yes, Yes because if he did the same with both of the eggs it would be the same.

Student answer: No, You should only have on different variable so you know why or why not the chickens laid more or less eggs.

Student answer: No, No, because it is too much food and too much food of anything is unhealthy.

Student answer: No, He changed 2 things we do not know if it worked or not.

Student answer: No, Because was not controlling the environment.

Student answer: No, because they might lay more egg than the others but maybe they just need a longer time with them.

Student answer: Yes, because the variable helps you see the conditions of the chicken and helps you see the difference.

Student answer: Yes because he did different things to one group than the other also it was over a long period of time.

Student answer: Yes, because there is the same amount of chickens but different amount of feed and calcium and how much eggs the chickens lay.

Student answer: Because he experimented that more feed equals more calcium and more calcium equally more eggs.

Student answer: Yes, yes: because he had the same amount of information for each group and he gave all the important information.

Student answer: Yes, Yes because it would be easier to observe them and maybe next time he knows what to do and how much food to feed them.

Student answer: No, Because he should have put for experiment what the right temperature was and how much light they got.

Student answer: No, He controlled 2 conditions at the same time so now he does not know which factor benefits the most.

Student answer: Yes, Yes because he graphed everything and sorted mostly everything.

Student answer: No, because he should of only had one condition that is different from the other not 2. That is so he knows what caused group y to lay more eggs than group x.

Student answer: No, Because he gave them different amounts of both chicken feed and calcium.

Student answer: Yes, Yes, because he kept it neat and it was easy to follow.

Student answer: No, because they are the same amount of chickens.

Student answer: Yes, he gathered all the information and kept track. The calcium added is even with the chicken food and they have the same range.

Student answer: Yes, because he fed them well and they laid a lot of eggs.

Student answer: No, different conditions.

Student answer: Yes, because all his chickens are still there and he laid eggs in the 100's, plus he took very good care of them, well!

Student answer: No, he tested 2 things at the same time he should only do one at a time.

Student answer: Yes, He recorded everything he did.

Student answer: Yes, yes, because he recorded everything and measured the amount it got.

Student answer: No, No, because he did not test enough variables. He only used 2 groups with very different amount of daily care.

Student answer: No, Andrew got the same amount of chickens. But, feed them different amounts of grams, to find out how many eggs the chickens would lay.

Student answer: Yes, because at the end he had 109 eggs in group x and he had 140 eggs in group y.

Student answer: No, Because he did not change any more than he needed too.

Student answer: Yes, because he found out they lay more with 1300 grams of feed and 30 grams of calcium.

Student answer: Yes, he did everything. Nothing was on it own.

Student answer: Yes, he took accurate data.

Student answer: Yes, because he can figure it out how much the foods or calcium will need.

Student answer: No, No, because in group x he did not supply enough food and calcium as he did for group y.

Student answer: Yes, Andrew did a good job he made sure the chickens had almost the same amount, it was also good because he had over a 100 eggs laid.

Student answer: Yes, He made the daily care different to see what their optimum condition.

Student answer: No, He needs to take more notes.

Student answer: Yes, Yes because, he did not add factors he did not need and he did not change his.

Student answer: Yes, Yes, because he did correct info and he had good variables.

Student answer: No, He did not do a good job of controlling the variables, because now you do not know what caused different results.

Student answer: No, He had too many variables.

Student answer: No, He should of recorded for each chicken separately.

Student answer: No, he should record data for each chicken.

Student answer: No, because he should have had a different number of tests with the grams section.

Student answer: Yes, because he made the chicken laid eggs after 2 weeks.

Student answer: Yes, because now he knows that more feed and more calcium for every 10 chickens produces more eggs.

Student answer: Yes, yes because he did not go off the charts in daily care.

Student answer: Yes, everything should have been the same besides one thing the thing he is testing.

Student answer: No, On the calcium for group section he should have made them even like 10 and 30 grams, or else he did excellent.

Student answer: Yes, yes because he did great in his experiment.

Student answer: Yes, because he used one variable.

Student answer: No, because you can get information of how much eggs they lay and the food for each group. Also the calcium for the chickens.

Student answer: Yes, because the only thing changed was the chicken feed.

Student answer: Yes, I think yes because it was well controlled and well organized. But he could have done better.

Student answer: Yes, Yes because he put the number of chicken it was low.

Student answer: No, because he did not control the variable.

Student answer: Yes, Yes because Andrew fed the chickens a good amount so the chickens laid there eggs.

Student answer: No, No, because the chickens got fed different amount and different amounts of calcium.

Student answer: No, Because he recorded more than one variable daily care and egg production.

Student answer: Yes, be the number of eggs laid by group y is a lot more than the eggs laid by group x.

Student answer: No, no because after listing the same amount of chickens it cost different amounts?

Student answer: Because he put too many chickens in one group and would not know which one laid eggs.

Student answer: No, No because he is not controlling anything but the numbers of chicken.

Student answer: No, because the should have put have look like every day.

Student answer: Yes, because he writes how much chickens, how much he fed the chickens, how much calcium they got, even how much eggs they laid.

Student answer: No, because he changed 2 things instead of one so he does not know which one works.

Student answer: No, Because there were 2 things that were different in the experiment. The food and the calcium. So he will not know which one of those affected it.

Student answer: No, Andrew should have given group x more calcium because 5 grams of calcium is not enough.