Children in two elementary school classrooms were given two versions of the same test, but with the order of questions arranged from easier to more difficult in version a and in reverse order in version b. randomly selected students from each class were given version a and the rest version b. the results are shown in the table. n latex: \overline{x} x ¯ s version a 31 83 4.6 version b 32 78 4.3(a) a 90% confidence interval for the difference in the means of the populations(b) at the 1% significance level, will you conclude that the a version of the test is easier than the b version (even though the questions are the same)? 2. a study to compare the mean level of ldl cholesterol in male and female students who do not exercise regularly gave the data shown in the table. we may assume that the populations of ldl level are normally distributed. nlatex: \overline{x}x¯ smale3510931female609626a 90% confidence interval for the difference in mean ldl cholesterol level between mean and women is13 ± 8.313 ±11.613 ± 9.813 ± 10.513 ± 7.6

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

i think it might be a but you might want a second opinion

nope.   happens to me as well.

-aparri

i would you but i don't under stand the qustion

step-by-step explanation: