stats-test 1
The ___ ___ is found by subtracting the first quartile from the third
Interquartile Range (IQR)
The size of the population is
N
A histogram is skewed to the left if its ____ tail is longer that its ____ tail
left; right
The ___ ___ ___ is the smallest value that can appear in that class
lower class limit
The ___ is calculated by summing all data values and dividing by how many there are
mean/average
The ___ is a number that splits the data set in half
median
The ___ is the value in the data set that appears the most frequently
mode
The size of the sample is
n
The type of sample expected to have the least bias is the
simple random
The types of sampling discussed in the class included: 4
simple random, convenience, stratified, cluster
For most data sets that are skewed to the left, the mean is ___ than the median
smaller
The ___ ___ ___ is the largest value that can appear in that class
upper class limit
The standard deviation is the square root of the
variance
Generally, the most biased sampling technique is
voluntary response
The cutoff points for determining outliers are called
Boundaries
The ___ ___ is the difference between consecutive lower class limits
Class width
Colors of cars on the highway. 2 answers
Qualitative nominal
Length of a birdsong. 2 answers
Quantitate continuous
Size of the leaves on a tree.
Quantitative continuous
Number of pencils in your backpack.
Quantitative discrete
In a data set, the proportion of items that are in a particular category is called the
Relative frequency
The symbol for the sample standard deviation is
S
When the right half of a histogram is a mirror image of the left half, the histogram is
Symmetric
Why are double-blind studies used?
To ensure there is no bias. Only used by medical. So you can't alter any results.
Over- or under-sampling a portion of the population results in
bias
The median is resistant because it is not affected by ___ ___
extreme values/outliers
The symbol that stands for a summation is
fancy E. sigma
In a data set, the number of items that are in a particular category is called the
frequency
For most data sets that are skewed to the right, the mean is ____ that the median
greater
Provide an example of a continuous variable
height or weight (anything that can have a decimal)
The symbol for the population standard deviation is
o with line extending from the right side
A value that is considerably larger or smaller that most of the values in a data set is called an
outlier
Population have ____ and Samples have ______
parameters; statistics
The numbers on a sports team's player's shirt are an example of a _______ variable
qualitative
Variable that classify elements by category or characteristic are referred to as
qualitative
Daughter, mother, grandmother, great-grandmother.... is an example of ______ variable
qualitative ordinal
Variables that count elements are referred to as
quantitative
The number of full-grown leaves on a tree is an example of a ______ variable
quantitative discrete
____ divide the data set into four parts
quartiles
The symbol for the sample mean
x̅
The symbol for the population mean is
μ
