Aresearcher wants to examine whether there is a difference in stress levels between single and married mothers of young children. what would an appropriate null hypothesis be for this study?

What happened in the 2000 election of al gore vs bush

The banking act of 1933, also known as the glass-steagall act, established the federal deposit insurance corporation (fdic), which a protected banks from failure by ensuring that the government would bail them out if necessary. b required american taxpayers to establish an account with a commercial bank. c protected depositors from financial losses when banks failed.

The authors of the paper "fudging the numbers: distributing chocolate influences student evaluations of an undergraduate course"† carried out a study to see if events unrelated to an undergraduate course could affect student evaluations. students enrolled in statistics courses taught by the same instructor participated in the study. all students attended the same lectures and one of six discussion sections that met once a week. at the end of the course, the researchers chose three of the discussion sections to be the "chocolate group." students in these three sections were offered chocolate prior to having them fill out course evaluations. students in the other three sections were not offered chocolate. the researchers concluded that "overall, students offered chocolate gave more positive evaluations than students not offered chocolate." indicate whether the study is an observational study or an experiment. give a brief explanation for your choice.