How to spot this family

• Power outage durations：You're given a list of raw data (10–25 values) · a) asks for the average / mean · b) asks for the sample standard deviation · c) asks for a confidence interval for the true mean at some confidence level · d) the width is written as $2\times C\times\frac{s}{\sqrt{n}}$, and asks what $C$ is and what it's called
• Cold start ignition time：Given a run of raw data (10–25 values) · a) asks for the average / mean · b) asks for the sample variance · c) asks for a confidence interval for the true mean at some confidence level · d) width written as $2\times Q\times\frac{s}{\sqrt{n}}$; asks what $Q$ is and what it's called
• Weld gap：Given a run of raw data (10–25 values) · a) asks for the average / mean · b) asks for the sample variance · c) asks for a confidence interval for the true mean at some confidence level · d) width written as $2\times D\times\frac{s}{\sqrt{n}}$; asks what $D$ is and what it's called
• Water pH：You are given a string of raw data (10 to 25 numbers) · a) asks for the average / mean · b) asks for the sample standard deviation · c) asks for a confidence interval for the true mean at some confidence level · d) The width is written as $2\times L\times\frac{s}{\sqrt{n}}$, asking what $L$ is and what it is called