b- Is he number in y=a.sin(bx+c)+d
period is the time it takes to make the entire pattern one time.
Thursday, January 7, 2010
Wednesday, January 6, 2010
Periodic Functions
To get the squiggly line, sin, cos, or tan(x)
Periodic function- One which repeats regularly over the same number of independant variable units (Domain), predictably.
In your calculator, when setting sin(x) always use zoom 7.
y=a. sin(bx+c)+d
Sinusoidal function - squiggly wave
"a"- value - controls the AMPLITUDE of the function. When measuring AMPLITUDE -
(max-min)/2
"b" value - controls the PERIOD of the function - b=(2pi)/period OR period= (2pi)/b
"c" value - controls the PHASE SHIFT or HORIZONTAL SHIFT - Left and right only
phase shift = -c/b
"d" value - controls the VERTICAL SHIFT - Up and down only
Periodic function- One which repeats regularly over the same number of independant variable units (Domain), predictably.
In your calculator, when setting sin(x) always use zoom 7.
y=a. sin(bx+c)+d
Sinusoidal function - squiggly wave
"a"- value - controls the AMPLITUDE of the function. When measuring AMPLITUDE -
(max-min)/2
"b" value - controls the PERIOD of the function - b=(2pi)/period OR period= (2pi)/b
"c" value - controls the PHASE SHIFT or HORIZONTAL SHIFT - Left and right only
phase shift = -c/b
"d" value - controls the VERTICAL SHIFT - Up and down only
Friday, December 11, 2009
Z-scores
Z-score formula:
Z= (x-xbar)
---------
ox
" the z score measures the distance plus or minus from the mean in units of std deviation"
x- what you got
xbar- what they got
ox- std deviation
if number is negative its BAD, positive, GOOD!
TO CLR LIST 2nd + 4 ENTER
Z= (x-xbar)
---------
ox
" the z score measures the distance plus or minus from the mean in units of std deviation"
x- what you got
xbar- what they got
ox- std deviation
if number is negative its BAD, positive, GOOD!
TO CLR LIST 2nd + 4 ENTER
Thursday, December 10, 2009
Characteristics of normal distribution:
Characteristics of normal distribution:
Theoretical (aproximation)
Symmetry about mean
Follows this rule:
68-95-99.7
mean-median-mode
2nd vars gets you to Normal cdf (low value, high value, x, ox)
How do you find out how many fish longer than 40 cm?
Normal cdf(40, E99)
E=2nd --> ,
Theoretical (aproximation)
Symmetry about mean
Follows this rule:
68-95-99.7
mean-median-mode
2nd vars gets you to Normal cdf (low value, high value, x, ox)
How do you find out how many fish longer than 40 cm?
Normal cdf(40, E99)
E=2nd --> ,
Tuesday, December 8, 2009
Boundaries, grouped data
Once you have your grouped data, enter it into your calculator in your lists and then
STAT--> CALC--> 1-var stats--> L2, L2
STAT--> CALC--> 1-var stats--> L2, L2
Monday, December 7, 2009
Thursday, October 8, 2009
Schedule of payments
Today we are using excel to make a schedule of payments. In don want to blog too much because i have to listen it is going by pretty fast and i need to pay attention. Untill we meet again!
To add a payment function - Formulas->insert function->PMT
To add a payment function - Formulas->insert function->PMT
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