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Improving the workplace experience of apprentices
Last registered on October 16, 2019

Pre-Trial

Trial Information
General Information
Title
Improving the workplace experience of apprentices
RCT ID
AEARCTR-0004607
Initial registration date
October 15, 2019
Last updated
October 16, 2019 10:21 AM EDT
Location(s)

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Primary Investigator
Affiliation
Department of the Prime Minister and Cabinet (Australia)
Other Primary Investigator(s)
PI Affiliation
Department of the Prime Minister and Cabinet (Australia)
Additional Trial Information
Status
On going
Start date
2019-09-11
End date
2020-09-30
Secondary IDs
Abstract
This study aims to assess the impacts of behaviourally informed messages on awareness and understanding of workplace laws among employers and recently commenced apprentices. This is expected to lead to better workplace experience for apprentices, which is in turn expected lead to increased retention rates.
A cluster randomised controlled trial will be used to assess the impacts of paired messages to apprentices and their employers on apprentices’ workplace experience and retention rates.

External Link(s)
Registration Citation
Citation
Greenwell, Harry and Su Mon Kyaw-Myint. 2019. "Improving the workplace experience of apprentices." AEA RCT Registry. October 16. https://doi.org/10.1257/rct.4607-1.0.
Sponsors & Partners

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Experimental Details
Interventions
Intervention(s)
A series of paired messages sent by email and SMS to apprentices and their employers in the trial.
Intervention Start Date
2019-09-18
Intervention End Date
2020-04-30
Primary Outcomes
Primary Outcomes (end points)
Apprentice retention
Primary Outcomes (explanation)
This is a binary measure (whether or not the apprentice is still in their training contract with their employer at the end of the follow-up period).
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
Two arm cluster randomised controlled trial, clustered at the business level.
Experimental Design Details
Not available
Randomization Method
Randomisation done on computer
Randomization Unit
Business level
Was the treatment clustered?
Yes
Experiment Characteristics
Sample size: planned number of clusters
Approximately 1,000 (depending on number of businesses enrolled)

Sample size: planned number of observations
3,000
Sample size (or number of clusters) by treatment arms
1,500 observations in the control and 1,500 observations in the treatment group, 500 cluster per arm
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
For the retention outcome measure, we estimate that we would need 2,998 apprentices to detect a standardised effect of 0.1 (one-sided test), 80% power, alpha of 0.05, cluster size of 3 and intra-cluster correlation coefficient (ICC) of 0.2. The standardised effect of 0.1 is equivalent to retention rate increasing from 66% to 71%.
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Bellberry Limited
IRB Approval Date
2019-08-23
IRB Approval Number
2018-12-1061-A-2
Analysis Plan

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