Mathematics, 20.09.2020 16:01 greend0719
Select all designs which describe an observational study that is not a survey:
*200 voters are randomly selected and asked how they will vote in an upcoming election.
* 60 pieces of lumber are randomly selected. Half of those are randomly assigned to be treated with a new dealer. 3 months later the level of rotting in the pieces is recorded.
* 100 pregnant women are randomly selected. For 8 weeks. the level of iron in their blood and their vital signs are recorded.
*400 incoming 6th grade students are randomly selected. Researchers record their results on a reading test at the beginning and end of the school year and compare the level of improvement seen in students at elementary schools to students at middle schools.
*300 people apply to test a new mattress. 100 of these customers are selected randomly to receive the new mattress and the others are given an older version. After 6 months they are asked to rate their satisfaction with the mattress.
Answers: 1
Mathematics, 21.06.2019 19:00
The quadratic function h(t)=-16.1t^2+150 choose the graph representation
Answers: 1
Mathematics, 21.06.2019 21:00
Simplify. 4+3/7x-2-2/7x a. 2-5/7x b. 6-1/7x c. 2+1/7x d. 6+5/7x
Answers: 1
Mathematics, 22.06.2019 00:00
Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!
Answers: 1
Select all designs which describe an observational study that is not a survey:
*200 voters are rand...
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