Answer:
c)
Step-by-step explanation:
The definition of an observational study is: one where researchers observe the effect of a risk factor or an intervention but they do not try to change who is exposed to the factor.
In this particular example, the researchers administered a questionnaire to 391 twelve-year-old and concluded that the body mass index of the adolescents who had a supply of sugary snacks in their bedroom was significantly higher than that of the adolescents who did not have a supply of sugary snacks in their bedroom.
This is not an observational study because the researchers actually administered a questionnaire and analyzed the results. To be an observational study the individuals would have been observed without any intervention (the questionnaire could have had an effect on the adolescents changing their habits)
Answer:
Give me the dollar first
Step-by-step explanation:
#2. There are 10 tally marks for recess, and 7 for gym. Add 10 and 7 to get 17 friends.
#3. Corey sorts out his flowers. How many flowers did Corey sort?
#4. He has 16 friends. We are going to subtract the total amount of friends from responded friends. There are 6 friends coming, and 3 who are not, which is a total of 9. Subtract 9 from 16 to get 7. You can write this as 16-9=7
Answer: look at the ss :)
Step-by-step explanation:
Answer:
Step-by-step explanation:
