Each person in a simple random sample of 1,200 received a survey, and 325 people returned their survey. How could nonresponse
cause the results of the survey to be biased?
A. Those who did not respond reduced the sample size, and small samples have more bias than large samples.
B. Those who did not respond may differ in some important way from those who did respond.
C. Those who did not respond caused a violation of the assumption of independence.
D. Those who did not respond are indistinguishable from those who did not receive the survey.
E. Those who did not respond represent a stratum, changing the random sample into a stratified random sample.

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High school seniors with strong academic records apply to the nation’s most selective colleges in greater numbers each year. because the number of slots remains relatively stable, some colleges reject more early applicants. suppose that for a recent admissions class, an ivy league college received 2851 applications for early admission. of this group, it admitted 1033 students early, rejected 854 outright, and deferred 964 to the regular admission pool for further consideration. in the past, this school has admitted 18% of the deferred early admission applicants during the regular admission process. counting the students admitted early and the students admitted during the regular admission process, the total class size was 2375. let e, r, and d represent the events that a student who applies for early admission is admitted early, rejected outright, or deferred to the regular admissions pool.suppose a student applies for early admission. what is the probability that the student will be admitted for early admission or be deferred and later admitted during the regular admission process?

What is the surface area of the sphere?