In two common species of flowers, A and B, the proportions of flowers that are blue are and , respectively. Suppose that independent random samples of 50 species-A flowers and 100 species-B flowers are selected. Let be the sample proportion of blue species-A flowers and be the sample proportion of blue species-B flowers. What is the mean of the sampling distribution of ? A) Pa- Pb B) Pa/50 - Pb/100 C) Pa^ - PB^ D) Pa(1-pa)/50 + Pb(1-pb)/100 E) √Pa(1-pa)/50 + Pb(1-pb)/100

Which statement describes absolute and apparent brightness? absolute brightness and apparent brightness are identical ways to describe the brightness of a star. absolute brightness and apparent brightness change with the distance from the star to the observer. absolute brightness depends on the distance from the star to the observer, whereas apparent brightness is always the same. absolute brightness is the actual amount of light produced by the star, whereas apparent brightness changes with distance from the observer.

2with a manual transmission, the speed of thevehicle determines

1  2  3  4  5  6  7  8  9  10  below is a chart representing portions of résumés from three applicants.                                      excerpts from résumés of three job applicants  job expertise    applicant 1  developed effective techniques for keeping order in the classroom    applicant 2  effectively designed a program for new employees    applicant 3  took many courses in child psychology and human development      which  best  explains the applicants’ careers?