1. Unit 2 Review
Math 075

2. Census Simple random sample Voluntary Convenience
You want to find out how students at COC feel about Hilary Clinton. How can you do this using the following sampling strategies?
Census
Simple random sample
Voluntary
Convenience
Have students do a think-pair-share

3. Good or Bad?
For this experiment, we decided to gather 20 prison inmates that were recently released and claimed that they wanted to reinstate themselves within society. We wanted to measure the way in which they would excel in society or not if they were given a job immediately after being released, or if were made to find a job on their own. Out of the 20 inmates, we gave 10 of them a stable job working for the city, and the other 10 were forced to find a job on their own. Our goal was to measure how many of the 20 inmates fell back into their violent or crime filled pasts or became productive citizens, and whether or whether not being given a job straight out of prison affected the final result.

4. GOOD Experimental units:
The 20 inmates that were manipulated into two separate groups
Explanatory variable:
The jobs that were given to 10 inmates compared to the other 10 who had to find their own job
Response variable:
If the inmates fell back into their violent or crime filled pasts, or if they excelled in society
Treatment:
The 10 inmates receiving a job working for the city, and those who were given nothing

5. Sample or Population
The teachers at Pavilion High school polled 200 students about the new dress code policy.

6. Experimental or Observational?
A Parks Department employee wants to know if latex paint is more durable than non-latex paint. She has 50 park benches painted with latex paint and has 50 park benches painted with non-latex paint.

7. Experimental or Observational?
A researcher asks college students how many hours of sleep they get on an average night and examines whether the number of hours of sleep affects students’ grades.

8. Good Or Bad?
 In 2011, a group of researchers experimented with a new antidepressant drug that would cure people of their depression. One group of 300 people took the drug for about a year. In 2012, a second group of 250 people were given a placebo pill and was told that they were given an antidepressant pill and it had to be taken for at least 6 months. 56 percent of the first group was cured of the depression and the second group only 30 percent were “cured” of their depression.

9. Bad…. Treatment: antidepressant drug
Experimental units: 300 and 250 people
Response Variable: the first group 56%  cured
Explanatory variable: none.  

10. Good or Bad?
In this experiment we attempt to measure the average productivity ranging between physical activities and household chores within one month between two average middle-class families. Family A has access to household electronics while family B is restricted from household electronics. How much more productive are family households without electronic distractions.

11. Good Explanatory Variable:
Whether or not the two family households have access to electronics
Response Variable:
How productive the two households were by the end of the month
We controlled the confounding variables by assuring the two families were both average middle-class families.