VOCABULARY
The study of how to collect, organize, summarize, and analyze information in order to draw conclusions or answer questions.
What is Statistics?
A women's favorite TV programs.
Is this variable Qualitative or Quantitative? Classify the quantitative variables as discrete or continuous.
What is an example of a Qualitative variable?
Draw a histogram with a bimodal distribution.
By definition: A histogram in which the two classes with the largest frequencies are separated by at least one class. The top two frequencies of these classes may have slightly different values.
Median is middle data value after ordering data
For even number of data
Median is the sum of middle two values divided by 2.
If
event A is owning a cell phone
then what is Ac [A complement]?
Ac not owning a cell phone
Data values that are very different from other measurements in the data set.
What is an outlier?
Salaries of CEOs of all companies in New York City.
Is the data collected from a population or a sample?
What is an example of data collected from a population?
How do you find the class width for a histogram?
(Largest data value-smallest data value)\(desired number of classes)
Formula for the standard deviation for a sample.
I will decide.
P(A and B)=0
Data are from only some of the individuals of interest.
What is sample data?
Temperature in CEO's private office.
Is this measurement level: nominal, ordinal, interval, or ratio?
What is an example of INTERVAL measurement level?
What is the formula for relative frequency?
f/n if we have a sample or
f/N if our data is from a population
How do you find Q1 (First Quartile ), Q2(Second Quartile), Q3 (Third Quartile)?
The median is Q2 .
The first quartile Q1 is then the median of the lower half of the data; that is, it is the median of the data falling below the Q2 position(and not including Q2).
The third quartile Q3 is the median of the upper half of the data; that is, it is the median of the data falling above the Q2 position (and not including Q2).
THIS IS FOR AN ODD NUMBER OF DATA.
You are given the information that P(A)=0.30 and P(B)=0.40.
Do you have enough information to compute P(A or B)?
no, you need to know the value of P(A and B).
This occurs when a subject receives no treatment but (incorrectly) believes he or she is in fact receiving treatment and responds favorably.
Sec 1.3 Intro to experimental Design
What is placebo effect?
Names of new products.
What is the level of measurement: nominal, ordinal, interval or ratio?
What is an example of nominal measurement level?
Waiting Time (hrs) Frequency
0 to 6 5
7 to 13 27
14 to 20 30
21 to 27 20
28 to 34 8
The lower boundary of the second class is 6.5,7, 7.5?
6.5
The following data give the number of items purchased by each 14 customers who shopped on a certain day at a supermarket.
18 14 22 7 9 13 19
25 13 4 16 22 6 10
Calculate the mean and standard deviation.
Mean ~ 14.14
SD ~6.5
Consider a collection of 6 balls that are identical except in color. There are 3 green balls, 2 blue balls, and 1 red ball. Compute the probability of drawing 2 green balls and 1 blue ball from a collection if the balls are not replaced.
P( green on 1st draw, green on 2nd draw and blue on 3rd draw)=1/10=0.10
value obtained by adding up all the data and dividing by the number of data.
what is the mean?
To conduct a preelection opinion poll on a proposed amendment to the state constitution, a random sample of 10 telephone prefixes ( first three digits of the phone) was selected, and all households from the phone prefixes selected was called.
Categorize the type of sampling: simple random, stratified, systematic, cluster or convenience.
What is an example of CLUSTER sampling?
Waiting Time (hrs) Frequency
0 to 6 5
7 to 13 27
14 to 20 30
21 to 27 20
28 to 34 8
The relative frequency of the second class is .22,.41,.30?
.30
Formula for weighted average.
weighted average= sum of xw divided by sum w
A certain state's auto license plates have three letter of the alphabet followed by a three digit number.
How many different license plates are possible if all three-letter sequences are permitted and any number from 000 to 999 is allowed?
26*26*26*10*10*10=17,576,000