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A university conducts a study about the extension of library working hours. From a random
sample of 300 freshmen, 180 of them indicated that they would use the library more if the
hours were extended. In an independent random sample of 200 sophomores, 125 of them
responded that they would use the library more if the hours were extended. Estimate the
difference in proportion of freshmen and sophomores responding affirmatively to this study.
Use %95 confidence level. Is the difference statistically significant? Why?​

Evaluate the expression for the given value of the variable. ∣-4b-8∣+∣-1-b^2 ∣+2b^3 ; b=-2

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

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