Suppose we know the correlation between iq and age in years is 0.12. if we change the units on age to months, the new correlation will be

0.12

Step-by-step explanation:

Statistical correlations are obtained by using standardized values of observation. Therefore, unit changes don't interfere in the correlation value.

Based on that reasoning, by changing age units from years to months, the IQ and age correlation remains the same, 0.12.

your answer would be 10x - 1

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.