which situation is an example of an observational study?
a. placing different groups of...
![subject](/tpl/images/cats/mat.png)
Mathematics, 13.01.2020 03:31 tmantooth7018
which situation is an example of an observational study?
a. placing different groups of people in different colored rooms and recording their mood
b. finding the number of red jellybeans placed in an average jar of jellybeans by counting
c. dividing a class into thirds, giving each third a different amount of time to read, and then testing comprehension
d. having customers fill out a questionnaire about their favorite brand of toothpaste
![ansver](/tpl/images/cats/User.png)
Answers: 2
Another question on Mathematics
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 17:40
The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?
Answers: 2
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 19:40
What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1
Answers: 2
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 20:00
0if x and y vary inversely and y=6 as x=7, what is the constant of variation?
Answers: 1
You know the right answer?
Questions
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 29.03.2021 23:10
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 29.03.2021 23:10
![question](/tpl/images/cats/mat.png)
Mathematics, 29.03.2021 23:10
![question](/tpl/images/cats/en.png)
English, 29.03.2021 23:10
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
History, 29.03.2021 23:10
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/biologiya.png)
Biology, 29.03.2021 23:10
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 29.03.2021 23:10
![question](/tpl/images/cats/mat.png)
Mathematics, 29.03.2021 23:10
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mkx.png)
Arts, 29.03.2021 23:10
![question](/tpl/images/cats/istoriya.png)
History, 29.03.2021 23:10