Final answer:
Laney's speech demonstrated 'informal language' through her phrases indicating uncertainty and a casual tone, which is generally not suited for formal speech settings.
Step-by-step explanation:
In delivering her speech where Laney often stated, "I'm not sure about this" and "I'm no expert" before or after her main points, she demonstrated what can be considered informal language. When a speaker uses non-technical, casual phrases that suggest uncertainty or a lack of authority on a subject, this typically signifies an informal style.
Such a tone might not always be appropriate for formal speech settings that generally require a higher degree of confidence and command of the subject matter. Laney's usage of these phrases suggests a degree of informal conversation that you might find in everyday speech rather than a structured and authoritative presentation.
Hence, her language falls into the category of informal language, which contrasts with the formal register you might expect in a setting where technical language and professional tone are recommended.