three researchers Alex Bob and Chuck independently select ra

three researchers, Alex, Bob, and Chuck, independently select random samples from the same population. Alex has the largest sample, Bob the next largest sample, and Chuck has the smallest sample. Each researcher constructs a 95% confidence interval for from his data. The half-widths of the three intervals are 0.015, 0.031, and 0.062. Match each half-width with its researcher.

half-width 0.015 _____

half-width 0.031 _____

half-width 0.062 ______

Solution

half-width 0.015 = Alex \'s sample

half-width 0.031 = Bob\'s sample

half-width 0.062 = Chuck\'s sample

( because , smaller samples cause wider confidence intervals!