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WorksheetsIED 1.1.2 Iterate and Redesign
Total questions: 10
Worksheet time: 5mins
A team designed a beanbag launcher. Their goal was: “Launch the beanbag exactly 5 ft, consistently.” Which statement best describes this goal?
A vague design requirement
A measurable design criterion
A user constraint
A design brief summary
A class compiled multiple teams’ launch distances into a single box plot. What is the main purpose of using this representation?
It shows exact values for each launch.
It visually compares center and spread across teams.
It ranks teams from best to worst.
It predicts future performance without needing statistics.
A device has a single launch much farther than all other values. What is this type of value called?
Range error
Fence point
Outlier
Mean deviation
A launcher recorded beanbag distances (in inches): 58, 60, 62, 63, 120. What measure of center is LEAST affected by the extreme value?
Mean
Median
Mode
Range
A team wants to redesign their launcher to improve consistency. Which improvement best aligns with this goal?
Increase launching force to maximize distance
Reduce variability between launches
Redefine success as “any launch over 10 feet”
Perform fewer test launches
A designer predicts that their next launch will fall within the interquartile range (IQR). Why is this prediction reasonable?
The IQR contains the lowest and highest values.
The IQR includes 50% of the data centered around the median.
The IQR is the average of all values.
The IQR removes all normal data and keeps outliers.
A team claims their launcher is successful because their longest launch exceeded 10 ft. The success criterion, however, was “consistent travel of 5 ft.” What conclusion is correct?
The launcher is successful based on maximum distance.
The launcher fails because max distance is irrelevant to consistency.
The launcher succeeds because exceeding any target is acceptable.
The launcher succeeds because the mean launch distance increased.
After redesigning their device, a team’s range decreased while their median remained the same. What does this imply?
The launcher became worse.
Consistency improved without changing central performance.
Launch distances became more random.
The team introduced outliers.
A student claims: “We tested only once, but the result matched our target, so our design is successful.” Why is this incorrect?
Single-value tests are not allowed in PLTW.
Success must be based on predicted values, not test data.
Consistency requires multiple data points to validate performance.
The mean must equal the target for success.
Which step of the redesign process is demonstrated when a team tests multiple prototypes and adjusts components to better meet measurable criteria?
Problem definition
Iteration
Communication
Constraint analysis
