Elementary Statistics

It is the science of collecting, organising, analysing and interpreting data in order to make decisions.

• Data

• Statistics

• Variable

• Population

What is data?

• Information coming from observations, counts, measurements or responses.

• The science of collecting, organising, analysing, and interpreting data in order to make decisions.

• A numerical description of a population characteristic.

• A numerical description of a sample characteristic.

What is Quantitative Data?

• Consist of attributes, labels, or nonnumerical entries.

• Consist of numerical measurements or counts.

• Consist of a subset of the population.

What is Qualitative Data?

• Consist of attributes, labels, or nonnumerical entries.

• Consist of numerical measurements or counts.

• Consist of a subset of the population.

• Model: qualitative data,

  Base Price: quantitative data.

• Model: quantitative data,

  Base Price: qualitative data.

• Both Model and Base Price are qualitative data.

• Both Model and Base Price are quantitative data.

According to a random telephone survey of 200 adults, 75% of all working adults in the U.S. are satisfied with their current job. What is the population in this survey?

• 200 adults
• adults in the U.S.
• 75% of adults

Zoie completes a report by asking 70 students across campus. She found that 48% of CTMS students do not wash their hands after using the bathroom. What is the sample size?

• 48
• 100
• 70
• CTMS students

• A
• B
• C
• D

A school randomly chose ten English teachers and asked them which type of juice their students would prefer. Which reason best shows why this sample is not a good sample in this case?

• The sample didn't include students.
• The sample is too small.
• The sample can only be accurate if each teacher is included in the sample

Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?

• thirty students who are often tardy
• thirty students who are rarely tardy
• thirty of her friends
• thirty randomly selected students from her school