Chapter 7 - Data Analysis and Evaluation

Question 1

What is Data?

Answer 1

Data is a collection of facts or raw information. Data can be displayed in many forms such as graphs.

Question 2

What are the 3 most common graphs?

Answer 2

Column graphs, sector graphs, and divided bar graphs.

Question 3

What is a frequency table?

Answer 3

It is an efficient way to organise and count a large set of data values.

Question 4

What is frequency?

Answer 4

The amount of times a value appears in a set of data.

Question 5

What is the two types of data?

Answer 5

Categorical and numerical.

Question 6

What is the difference between categorical and numerical data?

Answer 6

categorical can be grouped into categories like what is and isn’t seafood, whereas numerical can be counted or measured such as height or the amount of things.

Question 7

What type of data divides into two more types?

Answer 7

Numerical, and it divides into discrete and continuous.

Question 8

What is discrete data?

Answer 8

Is things that are counted or measured and can only take on separate distinct values, there can be NO DECIMALS

Question 9

What is continuous data?

Answer 9

Continuous data can be measured on a smooth scale without any gaps (no decimals) and can take on a full range of values

Question 10

What is the mean for a set of data?

Answer 10

The average value.

Question 11

What is the mean formula?

Answer 11

sum of values
———————— = x
number of values

Question 12

What is the mode for a set of data?

Answer 12

The most common value in a set of data.

Question 13

What is the median for a set of data?

Answer 13

The middle number, or the average of the two middle numbers.

Question 14

What is the range for a set of data?

Answer 14

The biggest value - the lowest value.

Question 15

What does the top row of a frequency table consist of?

Answer 15

Score, Frequency, Fx (Frequency x Score)

Question 16

What is a dot plot?

Answer 16

A graph that uses dots to show the frequency of each data value. They show gaps, clusters, and outliers.

Question 17

What is a stem and leaf plot?

Answer 17

It is like a sideways column graph. They show modes, clusters or outlies and how they spread out.

Question 18

Numerical Data can be graphed on what two thing?

Answer 18

A frequency histogram (bar graph) and a frequency polygon (line graph).

Question 19

What is a sample?

Answer 19

-surveys a representative group
-simple and inexpensive
-can be done quick

Question 20

What is a census?

Answer 20

-surveys all people or items
-gives exact information about the population.
-complex and expensive
-takes a lot of time

Question 21

What is the difference between a random sampling and a biased sampling?

Answer 21

Random, a sampling that is randomly selected, Biased, a sampling that is purposely selected based off different ideas.

Question 22

What is the criteria for a good survey question?

Answer 22

-uses plain English
-not too open-ended
-no bias
-protects privacy
-provides choices