Texas Instruments TI Programmable 57 User Manual

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LINEAR
REGRESSION
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Runninc It
Test
Scores
vs.
Performance:
An
Example
Let's
say
you're
a
businessman
and
your
sales
manager
is
spending
a
considerably
sum
on
a
test
for
prospective
sales
employees.
You'd
like
to
see
if
this
test
is
actually
telling
you
anything
about
how
well
the
employee
will
function
in
the
field.
Does
a
higher
test
score
mean
superior
sales
performance?
How
strong
a
correlation
is
there
between
these
two
factors
in
your
business?
If
there
is
a
good
correlation,
you'd
like
to
know
the
slope
and
the
intercept
of
the
straight
line,
so
you
can
use
these
values
for
future
predictions.
Also,
you'd
like
to
know
specifically
what
a
test
score
of
9
predicts
in
sales
performance;
and
what
value
test
score
would
indicate
a
sales
performance
of
75.
Let's
say
you
have
samples
of
the
test
scores
for
10
employees,
along
with
records
on
sales
performance
expressed
as
the
percentage
of
the
time
that
each
employee
exceeded
his
or
her
weekly
sales
goals
last
year.
The
data
is
tabulated
below:
Employee Sales
Employee
Employee
Test
Score
(x)
Performance
(y)
Jerry
Ross
13
30
Joe
8
30
Ralph
10
40
Mary
15
60
Gary
20
50
Dean
4
20
Carole
16
60
Ted
18
50
Alecia
6
20
Follow
the
steps
below
in
entering
the
data,
and
analyzing
it
to
make
a
prediction:

Texas Instruments TI Programmable 57 Specifications

General

Brand	Texas Instruments
Model	TI Programmable 57
Category	Calculator
Language	English