Processes
Sampling
Data
mean, median, mode
measures of spread
100
What is the second step in the statistical investigation process?
Collecting data - deciding how data will be collected and from whom (census or sample)
100
Types of sampling
Simple random sampling
Stratified sampling
Cluster sampling
100
How many basketball players are on the team?
14
100
What are the three forms of central tendency?
Mean
median
mode
100
What is measure of spread?
Describes how spread out data values are.
200
Give me 3 types of numerical data.
Height
Test Scores
Mode of transport
200
What is bias?
Bias is when data is collected unfairly, causing results to favour certain outcomes.
200
The number of times a response occurs is its ____________.
Frequency
200
Give me the formula for finding the mean.
mean = sum of values/Number values
200
What are the 3 common measures of spread?
range
Interquartile range
standard deviation
300
What is a statistical investigation?
a series of steps used to collect, organise, analyse and interpret data.
300
Example of each type of sampling.
Simple: Teacher randomly selecting 20 kids from the school roll
Stratified: a school population is divided into year 10, 11 and 12.
Cluster: Researcher randomly selecting 3 maths classes and every student is surveyed.
300
Is there an outlier in the data? If so, what height is it?
1.5 Inches
300
Find the mean, and mode of this data.
mean = 3
mode = 6
300
What is the formula for IQR?
IQR=UQ-LQ
400
Give me 3 examples of categorical data.
Favourite Sport
Eye Colour
Mode of transport
400
What is random error?
Random error is variation in data that happens by chance and cannot be completely controlled.
400
Which are there more of: plants with heights greater than 3 inches, or less than 3 inches?
Less than three inches.
400
1. Here is a list of numbers
(a) Write down the mode
(b) Work out the median
(c) Work out the mean
Mode = 15
median = 15
mean = 16.6
400
Steps to find the IQR.
1) Arrange in order
2) find median
3) Find median of lower half (Q1)
4) Find the median of upper half (Q3).
500
What does a good research question include?
is clear, specific, unbiased and can be answered with data.
500
Is this random error or bias?
A student accidently records a measurement inccrrectly.
500
How many party guests are older than 38 years old?
4
500
2. Here is a list of numbers
(a) Write down the mode
(b) Work out the median
(c) Work out the mean
mode = 1.4
median = 1.6
mean= =1.61 (2.d.p)
500
Find the IQR of:
2, 4, 6, 8, 10, 12, 14, 16
8
(Q1 = 5, Q3 = 13)