What is 
for a 99% confidence interval of the population mean based on a sample of 25 observations?
Definitions:
IM
Short for Instant Messaging, a method of sending real-time messages over the internet between two or more people.
User Authentication
A security process that verifies the identity of a user before granting access to a system or application.
Data Usage Costs
The expenses associated with the consumption of internet data by activities such as browsing, streaming, and downloading.
Response Times
The duration it takes for a company or individual to reply to inquiries, requests, or feedback.
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