Statistics Test 1

Parameter

(population) numerical value summarizes data for population

statistic

(sample) numerical value summarizes data for sample

Identify the population: The number of hours a group of 6 children in Mrs. Smith's kindergarten class sleeps in a day.

All children in Mrs. Smith's kindergarten class

How many people weigh in the range from 120 to 170 inclusive?

Count all weights from 120-170

Find the class width for this histogram.

Count between test scores. EX: 75.5-80.5 Class width: 5

A sports writer studies the batting average, walk to strikeout ratio, and home runs hit for a certain baseball player for three weeks for an article

Example of Case Study

Include each member of the entire population.

Example of Census

Heights of trees are an example of which type of data?

Example of Continuous

In order to save time, a biologist hand-selects the last ten people to leave to be studied in depth.

Example of Convenience Sampling

The average price of a car at the new car dealership in town is $28,700

Example of Descriptive Statistic

IQ scores, reported in whole numbers, of research scientists are an example of which type of data?

Example of Discrete

A recent poll of 3343 luxury car owners in West Virginia showed that the average price of a luxury car in the U.S. is $⁢33,800.

Example of Inferential Statistic

Boiling points (in degrees Celsius) for various substances

Example of Interval

A police chief compares fifteen newspaper articles about crime prevention.

Example of Meta-Analysis

Colors of cats owned by a sample of households

Example of Nominal

Educational level as reported in the census (Elementary school, High school graduate, Some college, etc.)

Example of Ordinal

The types of cars of all the coaches in the NFL.

Example of Population

51% of all babies born at the local hospital last year were boys.

Example of Population Parameter

Hair colors are an example of which type of data?

Example of Qualitative

Yards a running back rushes for during a football game are an example of which type of data?

Example of Quantitative

The total dollar value of all items in a safe

Example of Ratio

The heights of 14 out of the 31 cucumber plants at Mr. Lonardo's greenhouse

Example of Sample

A recent poll of 1771 corporate executives showed that the average price of their cars is $39,400

Example of Sample Statistic

A survey of 459 people in the U.S. revealed that 62% of those surveyed eat while they drive.

Example of Sample Statistic

An experiment in which only the subject does not realize whether they have been placed in the experimental or control group is

Example of Single Blind

A school administrator chooses twenty people at random from each math class.

Example of Stratified Sampling

First, the population is subdivided by city. Then a quality assurance analyst uses a random number generator to select twenty-five members from each city to study.

Example of Stratified Sampling

After a political strategist has enumerated a sampling frame, he picks a random starting point and chooses every fiftieth member.

Example of Systematic Sampling

These are both what type of sampling? A random number generator is used to choose fifteen regions. Then a college student collects data from each person in these regions. A statistics student interviews each member from each of the ten randomly chosen voting districts in a county.

Examples of Cluster Sampling

IRB

Institutional Review Board

When conducting legal experiments on animals, a researcher needs to obtain consent from the:

Institutional Review Board

Identify the population being studied and the sample chosen: The heights of 4 out of the 35 okra plants at Mr. Lonardo's greenhouse.

Population: The 35 okra plants at Mr. Lonardo's greenhouse Sample: The 4 okra plants at Mr. Lonardo's greenhouse

systematic sampling

Selecting every nth member of the population

Data on graph is higher on the right

Skewed to the left

Data on graph is higher on the left

Skewed to the right

To find class width:

Take 1st number of frequency in the second row and subtract from 1st number in the row above it. EX: 12-20 21-29 Subtract 21-12. Class width= 9

Identify the Sample: The number of hours a group of 12 children in Mrs. Smith's kindergarten class sleep in a day.

The 12 Children in Mrs. Smith's kindergarten class

Straight line on a graph

Uniform

sample

a subset of the population

Histogram

bar graph that displays frequency of quantitive data

quota sample

choosing specific amount for each subgroup

relative frequency

class frequency / sum of all frequencies

descriptive

collect/describe

statistics

collecting, describing, and interpretive data

discrete

countable

longitudinal study

data collected of series of time

representative sample

data collected, looks like population Ex: age, race, gender

nominal

describes names where order can not be assigned ex: Eye color

simple random sample

every sample has an equal chance of being selected

stem and leaf plot

graph of quantitative data split into 2 parts

meta-analysis

inside a study there is a summary of previous studies

inferential

interpret

cluster sample

into clusters (groups) each cluster is rep. then ordinary select clusters

Qualitative

labels/describes

case study

multiple variables that effect a single event

Pareto Chart

nominal data only. bar graph in descending order

Quantative

numbers

stratified sample

numbers divided into 2 or more subgroups, then random final each subgroup

ordinal

ordered position/rank ex: classification

random sample

population at random. whole population

response variable

responds to treatment

Convienience Sample

selecting out of connivence

cross-sectional study

single point in time for data collected

Variable

some characteristic of interest from population or sample

double blind

subjects and researchers don't know what group they are in

single blind

subjects do not know which treatment they are receiving

Reflective on a graph

symmetrical

Population

the entire collection of data to be analyzed (big)

Frequency

the number of times something happens

continuous

uncountable ex: time

piechart

used for qualitative data, shows parts of a whole

bargraph

uses bars to represent amount of data in a category