A study was conducted on the price of inkjet printers and how many pages per minute it could produce. See the data below.
When asked to predict y, use x=2.5 PPM.
A group of students took a reading test. The 18 students were ranked by GPA and then split off into the two groups of the study. One group had a prep session run by the teacher. The other group did not. The teacher assumed that the prepped group would do better. Did they?
A store wanted to compare two different display styles in their store. They randomly selected different days to try the different displays to see how many jars of peanut butter they sold. With the florescent display, 60 of 523 customers purchased. With the traditional display, 39 of 488 customers purchased a jar. Is there a significant difference between the displays?
A small pharmaceutical company designed a study to demonstrate that their new medication is more effective than their leading competitor at reducing reflux. The study involved a set of genetically identical twins -- one twin was randomly selected to take the new medication while the other received the existing brand. All of the tablets taken by participants looked identical. Neither the patients nor the doctors administering the medication to the patients knew specifically which brand the patient received in order to reduce any bias. At the end, the results were analysed to see if the new tablet caused the shortest amount of time for patients' stomachs to return to normal after a meal.