![subject](/tpl/images/cats/mat.png)
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.
![ansver](/tpl/images/cats/User.png)
Answers: 1
Another question on Mathematics
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 18:40
The table shows the results of three plays in a football game. what is the net result of the three plays? football game 1st play 5 yards 2nd play -9 yards 3rd play 12 yards
Answers: 2
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 19:40
Atextile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mean thread elongation of 12 kilograms with a standard deviation of 0.5 kilograms. the company wishes to test the hypothesis upper h subscript 0 baseline colon mu equals 12 against upper h subscript 1 baseline colon mu less-than 12 using a random sample of n equals 4 specimens. calculate the p-value if the observed statistic is x overbar equals 11.8. round your final answer to five decimal places (e.g. 98.76543).
Answers: 3
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 21:00
Reagan lives five miles farther from school than vanessa lives. write an expression to describe how far reagan lives from school
Answers: 1
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 23:00
Jane’s favorite fruit punch consists of pear, pineapple, and plum juices in the ratio 5: 2: 3. how many cups of pear juice should she use to make 20 cups of punch?
Answers: 1
You know the right answer?
Select all designs which describe an observational study that is not a survey:
*200 voters are rand...
Questions
![question](/tpl/images/cats/mat.png)
Mathematics, 03.08.2019 20:00
![question](/tpl/images/cats/mat.png)
Mathematics, 03.08.2019 20:00
![question](/tpl/images/cats/mat.png)
Mathematics, 03.08.2019 20:00
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/en.png)
English, 03.08.2019 20:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 03.08.2019 20:00
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/health.png)
Health, 03.08.2019 20:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/es.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 03.08.2019 20:00
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/en.png)
English, 03.08.2019 20:00
![question](/tpl/images/cats/en.png)