One indicator of physical fitness is a resting pulse rate. Ten men volunteered to test an exercise device advertised on television by using it three times a week for 20 minutes and ten other similar men did not exercise. Their resting pulse rates (beats per minute) were measured after 6 weeks. Results are summarized below. Researchers want to know if there is evidence that exercise can reduce resting pulse rates.
exercise group mean = 82.40
non-exercise group mean = 85.20
standard error for the difference in the two sample means = 6
1. With the difference in population means defined as "exercise mean minus non-exercise mean" which of the following presents the correct test statistic?
O (82.4 - 85.2) / 6
O (85.2 - 82.4) / 6
O (82.4 - 85.2) / √ (6)
O (85.2 - 82.4) / √ (6)

Consider the following geometry problems in 3-space enter t or f depending on whether the statement is true or false. (you must enter t or f -- true and false will not work.) f equation editorequation editor 1. a plane and a line either intersect or are parallel t equation editorequation editor 2. two planes parallel to a third plane are parallel f equation editorequation editor 3. two lines either intersect or are parallel f equation editorequation editor 4. two planes orthogonal to a third plane are parallel f equation editorequation editor 5. two planes orthogonal to a line are parallel f equation editorequation editor 6. two planes either intersect or are parallel f equation editorequation editor 7. two lines orthogonal to a third line are parallel t equation editorequation editor 8. two lines parallel to a third line are parallel t equation editorequation editor 9. two planes parallel to a line are parallel f equation editorequation editor 10. two lines parallel to a plane are parallel f equation editorequation editor 11. two lines orthogonal to a plane are parallel