stats-test 1

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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

The symbol for the population mean is

μ


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