MATH 225N WEEK 1 EVIDENCE, CLAIMS, AND TYPES LATEST ALL QUESTIONS AND CORRECT ANSWERS(VERIFIED ANSWERS)

1. A study is planned to research the effects of drinking coffee on hours of sleep. Would an experimental or observational study design be more appropriate? Select the correct answer below: An observational study should be used because it is not possible to control whether or not a person drinks coffee. An observational study should be used because it is not possible to control the number of hours of sleep a person has. An experimental study should be used where the consumption of coffee is the experimental factor. An experimental study should be used where the number of hours of sleep is the experimental factor. 2. A researcher is interested in the effects of watching videos just before bed on the quality of sleep. Which of the following claims would be appropriate for this situation? Select only one answer choice. Select the correct answer below: Watching videos just before bed reduces quality of sleep. More than 60% of people watch videos just before going to bed. Watching 1 hour of video just before going to bed reduces the number of minutes of REM sleep by more than 10%. Watching 1 hour of video just before going to bed reduces the quality of sleep. 3. In a psychological study aimed at testing a medicine for reducing stress levels, the researcher grouped the participants into 2groups and gave the stress-reduction pill to one group and a placebo pill to another group. In the description of the above situation, determine the experimental group. Select the correct answer below: The group that received the stress-reduction pill is the experimental group. The group that received the placebo pill is the experimental group. Both the groups are experimental groups. Neither group is an experimental group.