How many ways are there of choosing 4objects, without replacement, from 16 distinct objects, if the order of the choices matters?
the order of the choices does not matter?

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is . reset next