I. $(30\%)$ Do We Need to Measure Everything? Working with Samples

Description: Project teams plan data collection and review sample results for Precision Delivery Inc.

Purpose:

Identify data collection requirements.

Identify potential sampling bias or measurement problems.

Apply the basic principles of sampling.

Time Required: $40-60$ minutes

Exercise: $30-40$ minutes

Debrief: $10-20$ minutes

Materials Required:

Precision Delivery Inc. Case Study.

Project Proposal Description.

Data Collection Planning Sheet.

PDI Sampling Data.

Precision Delivery Inc. Case Study

Precision Delivery Inc. $($PDI$)$ is a package pickup and delivery service for homes and small businesses.

PDI specializes in packages of $50$ pounds or less and has a full$-$price rebate policy for any pickup or

delivery made outside the customer$-$designated $15-$minute window. PDI advertising proudly states,

"Pickup and delivery at your convenience, not ours."

PDI has facilities at $2$ locations, Downtown and Suburbia, each servicing customers within a $15-$mile

radius with pickup and deliveries made by truck or bicycle. Customers designate a $15-$minute window

for their packages to be picked up or delivered. PDI charges customers $$5$ per package plus $$1$ per

pound $(50-$pound maximum$).$

PDI Sales Operators receive pickup and delivery requests by phone from customers. Dispatchers issue

instructions to Field Operators for pickups and deliveries. To ensure prompt service, Dispatchers plan

for $30$ minutes of travel time, one way, for each pickup or delivery and target arrival time for the

start of the $15-$minute window. Under current procedures, travel time over $45$ minutes will result in a