# Samples and surveys

When we collect data it's important to know what type of data we're collecting and how to collect it properly.

## Problem 1: Qualitative and quantitative data

A survey was given that included data on each student's field of interest, age in years, number of languages spoken, and handedness.
DavidBeccaPaige...
Field of interestcomputer sciencejournalismchemistry...
Age (years)131514...
Languages spoken211...
Handedrightleftright...
question a
Is "field of interest" qualitative or quantitative?
Velg ett svar:
Velg ett svar:

Question b
Is "age (years)" qualitative or quantitative?
Velg ett svar:
Velg ett svar:

Question C
Is "languages spoken" qualitative or quantitative?
Velg ett svar:
Velg ett svar:

Question D
Is "handed" qualitative or quantitative?
Velg ett svar:
Velg ett svar:

## Problem 2: Representative samples

question a
Jillian wants to know what percent of students at her school watch sports on TV. Which strategy for sampling will be more likely to produce a representative sample?
Velg ett svar:
Velg ett svar:

question b
Theo wants to know what percent of students at his school have a computer. Which strategy for sampling will be more likely to produce a representative sample?
Velg ett svar:
Velg ett svar:

## Problem 3: Sampling methods

Willy wants to find what percent of students at his school drink the milk after they finish their cereal. He is considering the following sampling methods:
question a
He selects every tenth person who enters the school. What type of sampling is this?
Velg ett svar:
Velg ett svar:

question b
He randomly selects 10 students from each grade level (freshman, sophomore, junior, senior). What type of sampling is this?
Velg ett svar:
Velg ett svar:

question c
He randomly selects 50 student names from a hat. What type of sampling is this?
Velg ett svar:
Velg ett svar:

question d
He randomly selects 3 classrooms and surveys every student in those classrooms. What type of sampling is this?
Velg ett svar:
Velg ett svar:

## Problem 4: Biased wording in survey questions

Willy wants to find what percent of students drink the milk after they finish their cereal. Which survey question below is the most unbiased?
Velg ett svar:
Velg ett svar: