Keeley is interested in buying a futon sofa for her studio a…

Keeley is interested in buying a futon sofa for her studio apartment. She looks online to see what style and color would look good in her apartment, but she can’t actually sit on the futon to determine if it is comfortable enough to also serve as a bed. What type of modification is Keeley able to evaluate? What type of modification is she unable to evaluate?

A new antibiotic has just been developed, and scientists wan…

A new antibiotic has just been developed, and scientists want to determine whether it is more effective than the current drug being used. They develop a study and divide 20 participants equally into Group A (the new antibiotic) and Group B (the current drug). They measure the average bacterial colony count (in thousands) after treatment with the different antibiotics. The average colony count for Group A is 5.4 thousand unit (standard deviation, s = 0.4) and the average colony count for Group B is 6.4 thousand unit (standard deviation, s = 0.5). Given the information provided, which statistical test would be used to analyze these data?