A researcher was interested in the impact of exercise on mental health. He recruited two groups of participants: 30 who engaged in an hour or more of aerobic exercise daily and 30 who did not engage in any aerobic exercise. He administered a valid mental health inventory to all and found lower scores (i. E., lower mental health) in the sedentary group. He concluded that exercise had a positive effect on mental health. How does this design either support or fail to support this conclusion? Be specific.

Which of the following methods could be considered a "best practice" in terms of informing respondents how their answers to an on-line survey about personal information will be protected? respondents are informed that investigators will try to keep their participation confidential; however, confidentiality cannot be assured. respondents are informed that a research assistant will transfer all the research data to a password-protected computer that is not connected to the internet, via a usb flashdrive. the computer is located in a research team member's office. the investigator uses the informed consent process to explain her institution's method for guaranteeing absolute confidentiality of research data. the investigator uses the informed consent process to explain how respondent data will be transmitted from the website to his encrypted database without ever recording respondents' ip addresses, but explains that on the internet confidentiality cannot be absolutely guaranteed. the investigator uses the informed consent process to explain how respondent data will be transmitted from the website to his encrypted database without ever recording respondents' ip addresses, but explains that on the internet confidentiality cannot be absolutely guaranteed