Keisha wants to find the average height of students in the \( 12^{\text {average height. }} \) grade at East High School. So she will use a sample of students in the 12 grade to find the Answer the questions below. \( \begin{array}{l}\text { (a) Which unit(s) could be used for the unit of measurement? Check all that apply. } \\ \square \text { minutes } \square \text { feet } \\ \text { (b) Which of the procedures below would be the best way to find the average height? } \\ \text { Randomly pick } 50 \text { students from the } 12^{\text {th }} \text { grade and measure their heights. } \\ \text { Randomly pick } 5 \text { students from the } 12^{\text {th }} \text { grade and have them state their own heights. } \\ \text { Ask for } 50 \text { volunteers from the } 12^{\text {th }} \text { grade to state their own heights. } \\ \text { Measure the heights of } 5 \text { volunteers from the } 12^{\text {th }} \text { grade. }\end{array} \)
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Feet is the best unit of measurement for height since it perfectly captures the size we're measuring. Minutes don't quite match; we wouldn't want to compare how tall someone is to how long something takes! The best way to find the average height of the students would be to randomly pick 50 students from the 12th grade and measure their heights. This method reduces bias and gives a more accurate representation of the entire grade compared to relying on self-reported heights or a small group of volunteers. So, go for randomness and the more, the merrier!
