1. \"Dr. Meyer wants to studythe effect of Kava root on insomnia. She recruits 150 people whoexperience long term insomnia (more than 4 months experiencinginsomnia) and divides them into two groups. One group of 75individuals takes 125 mg of kavalactones one hour before bedtime.The other group of 75 individuals takes a placebo every day. Forthe duration of the study, the two groups follow two commonguidelines: no added sugars or caffeine intake after 12pm and noscreen time an hour before bedtime. Dr. Meyer follows theindividuals during four weeks. She collects data on sleep patternswhich include the number of hours slept each night and a scale ofdifficulty to fall asleep scored 1 to 5 (1 = feel asleep rightaway; 5 = more than one hour awake in bed).\"

Answer Following:

What is the independent variable?

What is the dependent variable?

What is the experimental group?

Which is/are Dr. Meyer’s controlledvariable(s)?

2. \"“If Vitamin C supplementation shortens the length of thecommon cold, then adults taking 1g of Vitamin C a day will recoverfrom the common cold faster than adults who aren’t taking Vitamin Csupplementation.”

Is the following statement a prediction or atheory? How do you know?

Write a possible hypothesis for thisexperiment.