2.3 Organizing Quantitative Data
V) Grouping into classes
Single value grouping: group quantitative data in which each class (single-value class)
represents a single possible values.
Example1: The following data set gives us the number of TV sets in 15 ra
For the provided sample meanI sample size, and population standard deviation, complete parts (a) through (c) below. Assume that x is nonnally distributed.
Ine margln 01 error Is 2.31- .
cfw_Roundto hvodecirnal places as needed.)
d. For a random sample of size 2. what is the chance that the sample mean will equal the population mean?
The probability is 0.
[Round to three decimal places as needed.)
2. For a random sample of
y f . I . I
Mry is sampling often preferable to conducting a census for the purpose of obtaining information about e population?
Shoovse the correct answer below.
$- A. Sampling is less costly and can be clone more quickly than H census.
.1?" B. Sampling
According to a recent publication, the mean price of new mobile homes is $62,300. Assume a standard deviation of $7000. Let it denote the mean price of a sample
new mobile homes.
a. For samsz of size 50. nd the mean and standard deviation of )_(. Interpre
The data in the table represent the ages ofthe winners of an award for the past ve years. Use the data to answer questions (a) through to.
a. Determine the population mean age. p, at the ve winners.
('l'ype an integer or a decimal.)
b. Consider sample
ll in the blank.
The value of a statistic used to estimate a parameter is called atn] ef the parameter.
The value of a statistic used to estimate a parameter is called atn] paint estimate of the parameter.
20 October 2015
A question that the average person asks at least once in their life is how to change a flat tire?
This is a question that everyone who drives should know no matter the race, religion
Kate Chopins short stories usually are about women who are enslaved by gender roles
and double standards. In the stories we read The Storm, The Story of an Hour, and Desirees
Baby there are three women who are married Calixta, Louise, and Desiree. Out of
When estimating an unknewn parameter, what dees the margin eferrer indie-ate?
Cheese the eerreet answer belew.
":3 A. ll indieates the level at eendenee at an estimate fer the value ef the unknewn parameter.
'3'] B. it indieates the value ef the statistie
For the provided sample mean, sample size. and population standard deIlI'iationI complete parts [a] through (c) below. Assume that x is normally distributed.
b. Identify and interpret the margin of error.
The margin oferror is 2.94- .
CHAPTER 2: Organizing Data
Section 2.1 Variables and Data
Variables: characteristic that varies from one person or thing to another
Data: Value of a variable.
Qualitative variables: Non-numerically
CHAPTER I: The Nature of Statistics
Give some examples for statistics used in day-to-day-life?
statistic(s) - facts or data, either numerical or non-numerical, organized and summarized
so as to provide useful and accessible infor
5.1 Probability Basics
Probability for equally likely outcomes
Suppose an experiment has N possible outcomes, all equally likely. An event that can occur in
f ways has
Probability of an event = f
Where = , =
Chapter 3: Descriptive Measures
3.1 Measures of Center/measures of central tendency (indicates the center of the data set)
o The sum of the observations divided by the number of observations.
o Apply to quantitative data
Example 01: The
3.3 Chebyshevs Rule and the Empirical Rule
Empirical rule: For a symmetric (bell shaped) distribution
Example : Birth weights of females in the United States (full-term) have a bell-shaped distribution with
mean of 7.54 pounds and a st
3.2 Measures of variation (indicates the spread of the data set)
Two data sets can have the same mean, median, or mode and still differ in other respects.
To describe that difference quantitatively, we use a descriptive measure that indicates the amount o
5.4 Discrete Random variables and Probability distributions
(Related to variables and relative frequency distribution)
Random variables: A random variable is a quantitative variable whose values depend on chance.
Typically, we use capital letters towards
Although. in general, you unnot know 'la sampling distribulian uf'le sample mean axacy. by what dislribution can you often approximate it?
Choose the curred answer below.
a? a. A binomial dish-ibuiiun
'3: '3' C. APoisson dishibu
What is meant by saying that a statistical prooed ure is robust?
Choose the correct answer below.
it A. A statistilll procedure that works reasonably well even when one of its assumptions is violated is said to be robust.
"'21- B. A statistilll prooedure
Happiness and Truth
Brave New World is full of characters that do everything they can to avoid facing
the truth about their own situations.
The broad and conventional use of a drug called soma is probably the most
omnipresent example of their extreme effo
Quitting is a monstrous idea that is present in your mind from the start of anything you try.
Whether its something easy or hard, the idea of quitting is present in the back of your head from the
moment you start anything. For some people quitting is too