Great beginning of the year activity to determine your students prior graphing skills. I usually do use this activity to determine if students are able to label axes, put a title on a graph, etc.
Required materials: Stopwatch, Students, and Pencils.
To complete the activity, you can involve as many students as you would like. I typically took volunteers until I had about half of the class involved in the actual hand squeezing (the worksheet is editable, so you could add space for more students in the data table). Starting with two students, have the first student squeeze the hand of the second. As the teacher, you will need to have the beginning and ending student let you know when they feel the squeeze. Then, add on one more student, and repeat the timing (tell the first student to squeeze, and ask the last student to tell you when they feel it and stop the stop watch). Continue this procedure until you have included as many students as you would like to involve.
Then, students should graph the data on the graph paper grid provided and answer a few simple analysis questions.