Wood Block Experiment

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Objective

The objective of the “Wood Block Experiment” is to illustrate simple comparative testing. Specifically, the one sample t-test and the paired t-test. The students are given a simple wooden block that is supposedly 1-inch cube (as stated on the packaging). They are asked to confirm or reject the manufactures claim that the blocks are 1-inch. In addition, the students are given two measuring instruments; a plain ruler and a supposedly more accurate caliper. The students are then asked to determine if the two measuring instruments measure differently.

Equipment - per group

  1. 10 1-inch wood craft blocks (50 for $5.50, Woodworks Ltd. www.craftparts.com )
  2. 1 metal 12-inch ruler ($2.99, Office Max)
  3. 1 dial caliper ($39.40, Production Tool)
Wood Block exp

Procedure

Break up into groups of 2 to 3 members per group. Confirm or reject the claim by the manufacture that the Blocks are 1-inch. Compare what you think is the most accurate measuring device with the least accurate measuring device and determine if they measure differently. In both experiments, take note of how you perform your experiment and what equipment/supplies you used. Also, note any procedures you followed to reduce error and any relevant assumptions you made. Include anything that may shed light on why you ran your experiment the way that you did.

Analysis and Discussion

Describe and run the appropriate analysis to reject or fail to reject your null hypothesis and explain why you chose the particular analysis technique. Clearly identify all the important parameters. Include Minitab output including any graphs you believe will help convey your results. Interpret the results in an insightful manor. State your conclusions in laymen’s words.