Type of Graph
Options for Graphical Data Displays
Variable
Purpose
Displayed
Categorical
Variable(s)
Shows what part of
the whole each
group forms
Categorical
Variable(s)
Allows the reader to
quickly compare
counts or percents
1 Quantitative
Variable
Show
Unit1and2TestReview
Itemstogobackover:
a. Reviewwhatadding(orsubtracting)anamounttothedatadoestothemean,median,
standarddeviation,IQR,andrange.
take the data: 1 1 2 3 3 add 5 to the data and you get: 6 6 7 8 8
Themeanandmedianhavebothincreaseby5,howeverth
FINDING BEST FIT LINES
(TI-83/84)
STAT
Let L1 = x, L2 = y
ENTER
STAT PLOT
(2ND Y=)
Scatterplot L1 and L2
ENTER
STAT
Choose scatterplot graph; x and y lists
CALC
ZOOM
8: LinReg (a + bx)
9
ENTER
To store equation in calculator
L1, L2
L1, L2,
ENTER
VARS
Y-VA
Name: _
Non-linear Regression
AP Statistics
For the following problems, sketch a scatterplot & residual plot. If necessary, transform the data and
re-plot. Find an appropriate regression equation that can be use to make predictions.
1) We attempt to find
A.P. Statistics - Sampling and Experimentation terms
Sampling Techniques - can be done with surveys and observational studies
1) Simple Random Sampling (SRS) - every unit or group of units has an equal chance of being chosen
Example: In a Home Depot, ther
2015 AP6 STATISTICS FREE-RESPONSE QUESTIONS
Formulas
(1) Descriptive Statistics
X'
T = E '
FE
_ a a
131— _2
it“s—X)
b0=_T‘—b]Y
I .r.—F 32—?
r: E l J
n—I .s_ 5
A. y
s
bl=r_J_
s 2015 AP3 STATISTICS FREE-RESPONSE QUESTIONS
(II) Prohabi lity
PM u B)
AP Stats
Coefficient of Determination
Name_KEY_
1. Nine students were tested to determine the effect of test anxiety on test scores.
The data is shown below.
Test Anxiety Score (x)
Exam Score (y)
23
43
14
59
14
48
0
77
17
50
20
52
20
46
15
51
21
51
a. Fin
AP Statistics — Summaryr of Conﬁdence Intervals and Hypothesis Tests
“ calculaturuutiuns
Procedure
Conﬁdence
Interval for mean
p when 0' is
known
Hypothesis Test
for mean p. when
or is known
(Ho: p - pa}
C] for mean it
when o is
unknown
fir" 'l,_
UH
with
Bivarant Data
Scatterplots
Describe a scatterplot means:
Strength: strong/ moderate/weak
Form: linear/nonlinear
Direction: Positive/Negative
Extrapolation
Is
BAD
Be able to read and interpret a computer printout
Yhat= 1.08921 +0.188999(days)
Residual plot
USING AN LSRL AS A LINEAR MODEL
(Sec 3.3)
1.
The table below shows the average daily energy requirements for male children and adolescents:
Age (Years)
Energy Needed (Calories)
1
1100
2
1300
5
1800
8
2200
11
2500
14
2800
17
3000
a)
Graph the data and stat
10.1 — Conﬁdence Interval Basics
Conﬁdence Inter-vol A. level C confidence interval is of the form estimate a: margin ofermr
The conﬁdence level C gives us the probability that the interval will capture the true mean of the
population. So when we use a 95
AP Stats
Coefficient of Determination
Name_
1. Nine students were tested to determine the effect of test anxiety on test scores.
The data is shown below.
Test Anxiety Score (x)
Exam Score (y)
23
43
14
59
14
48
0
77
17
50
20
52
20
46
15
51
21
51
a. Find th