in two common species of flowers, a and b, the proportions of flowers that are blue are pa and pb , respectively. suppose that independent random samples of 50 species-a flowers and 100 species-b flowers are selected. let pˆa be the sample proportion of blue species-a flowers and pˆb be the sample proportion of blue species-b flowers. what is the mean of the sampling distribution of pˆa−pˆb ?

How long must a student wait for feedback on how they did on the accuplacer? a. 1 day b. 1 week c. 1 month d. immediate feedback (no wait)

In her article "why should i vote? " stephanie goggin crafts a well-organized and coherent argument. she states that every person of voting age who is registered should vote. she also argues that if you are not registered to vote, you should be. in conclusion, goggin's argument is laid out in a thoughtful and thorough way that is convincing to readers. which element is missing from this evaluation?

Abag contains even and odd numbered balls in the ratio of 3: 7, respectively. for each of the following, what is the probability of drawing an even-numbered ball? the total number of balls is 240 and 30 of the odd-numbered balls are renumbered by multiplying the numbers by 4.