Stockton Students: Are they
Satisfied With Their Residency?
Are Stockton Students Satisfied with their
83 Stockton students were randomly surveyed and asked
the following questions:
Are you a male or female?
What year are you?
Types of random variables
fixed number of values for a variable (often whole
Infinite number of values in an interval
Data Distribution Discrete Data
Data Distribution Continuous Data
Estimation is the process of finding a parameter of
a population based on the statistics of a sample.
Sample is never a perfect representation of a
population. (Remember sampling error.)
Statistics may vary from sample to sample.
A way to use statistics to evaluate claims about a
A hypothesis is a supposition about a parameter
of a population.
Hypothesis may or may not be true.
Null hypothesis H0 no difference between the
Chapter 7 Quiz Review
are known, then use Z
are unknown, then use
10. N = (p)(q)( E
N = (0.5)(0.5)(
N = (0.5)(0.5)( 0.0055
90% confidence interval & n = 25
p = 54
H 1 : p < 54
If you dont know the population standard deviation
Freshmen and Seniors study the same amount of hours
Freshmen study less than Seniors
H 0: F
Chapter 4-1 Exercises
1. A chance process that leads to well-defined results called outcomes
2. The set of all possible outcomes of a probability experiment
3. Outcome is the result of a single trial of a probability experiment. An e
The chance of an event occurring
Games of chance
Based on inferential statistics
Probability Experiment chance process that
leads to well defined results (outcomes)
Science of conducting studies to collect, organize,
summarize, analyze, draw conclusions from,
Data values collected for variables from sample subjects
Organization of raw data into table form us
\ (2 maa Mam WW5 are Mel/wind if (lg/M)
(2.54 disc/dc Mud/came 42 cfw_my; numb/0f ght W
Values 0/ an cfw_Mn/26 WW fm/ua W am it muddy
(mfmuoos fancier)? Vanni/:5 WWW/1:3 5m WW
(an /): mmsued War 772% (Of/11W.
1 #Of (OMMMs a radio amrm [
K We of WW jivdtes f0 (ec 0.94% f SUM/"0729
Wm M (1/sz [wt/151m; f/m (lam
, - variabk 1:4 (/quch or diff/Me WWnaSX/e _
Jim/w [Ia/065. f
_ whim W mam W2 of if 35 *0 deft/mike Hg
(em/fianmf 07 M51) #155wa (9% key/MM.
.,A V/xz/Iodimxsr/cfw_mmbmsm k mm Wm
Variable characteristic that can assume different
Variables used for probability are random
Value of a random variable is determined by
Variables are discrete or continuous.
Discrete can have s
Statistics is the science of
conducting studies to collect,
organize, Summarize, analyze, and
draw conclusions from data.
Averages central tendencies
Science of conducting studies to collect, organize, summarize,
analyze, draw conclusions from, and present data.
Types of Statistics
Descriptive collect, summarize, organize, present
Inferential generalize from samples to
populations, test hypo
z Z /2 n
For the 90% confidence interval, = 10%, and the outliers are 5%
Example: 1, 2, 3, 4, 5, 6
= 2 + -1 + 4 + 6 + 1002 + x
x t /2
Df = 6
N = 10, x = 9.8, s = 0.96, with 95% confidence inter