Question

A teacher interested in determining the effect of a new computer program on learning to read conducted a study. One hundred students were randomly assigned to one of two groups. The first group used the computer program while the second group did not. Both groups were tested to determine how much their reading levels improved. The results for the two groups were compared. What kind of study is this?

Answer 1

This is an experiment since there are two groups. One group is the treatment group where the experiment is done on (in this case where they use the new computer program). The other gorup is the control group who takes the placebo.

Ideally the test subjects would NOT know if they are using the old program or new program. The test subjects are "blind" to which program it is. If both subjects and researchers don't know what test is what, then it's considered a `double blind study`

Answer 2

This is an experiment because a treatment was applied to a group.
This is an experiment because students were able to choose which group to join.
This is a survey because students were randomly assigned to groups.
This is a survey because a treatment was applied to both groups.


those are the only options

Answer 3

Which do you think it is based on my first post above?

Answer 4

a?

Answer 5

yes

Answer 6

btw, the students are randomly assigned to a group. So they won't be able to choose which group they want

Answer 7

A study of a new medication found that patients who took the medicine have reduced blood pressure, compared to those who did not take the medicine. The research team concluded that the medicine caused the reduction in blood pressure. Which study design did they most likely use?

They most likely used an experiment with patients randomly assigned to take the medicine or not take the medicine.
They most likely used an experiment with patients randomly assigned to groups based on their blood pressure.
They most likely used a survey asking patients if they took the medicine and how their blood pressure was affected.
They most likely used a survey asking patients if they took the medicine and if they felt the medication helped their blood pressure.

would this be d?

Answer 8

this is very similar to the last problem

Answer 9

a?

Answer 10

yes another experiment with random assignments to either take the medicine or the placebo (patients will not know which is which)

Answer 11

so a is correct?

Answer 12

yes

Answer 13

Two ad agencies want to understand issues that are important to students. Agency A will interview 50 students whose names are randomly chosen from school enrollment data. Agency B will interview 50 randomly selected people from those who respond to a social media posting. Which method will produce a fair sample of the student population and why?

Agency A, because students are convenient and easy to interview
Agency A, because names randomly selected from school data will be student names
Agency B, because people who respond to social media postings have strong opinions
Agency B, because people who respond to social media postings are usually students


A?

Answer 14

hint: random is always best

Answer 15

oh so b?

Answer 16

yes agency A did it better because it's more representative

Answer 17

last one for this section, is my answer correct?

Answer 18

@jim_thompson5910