Statistical calculations, Mean – HP 33s User Manual
Page 148
11–4
Statistical
Operations
Statistical Calculations
Once you have entered your data, you can use the functions in the statistics menus.
Statistics Menus
Menu
Key
Description
L.R.
|
The linear–regression menu: linear
estimation {
º
ˆ
} {
¸
ˆ
} and curve–fitting {T} {P}
{E}. See ''Linear Regression'' later in this
chapter.
x
,
y
|
The mean menu: {
º
} {
¸
} {
·
º
}. See
"Mean" below.
s,
σ
|
The standard–deviation menu: {Uº} {U¸}
{
σº} {σ¸}. See "Sample Standard
Deviation" and "Population Standard
Deviation" later in this chapter.
SUMS
|
The summation menu: {Q} {;º} {;¸} {;º
}
{;¸
} {;º¸}. See "Summation Statistics"
later in this chapter.
Mean
Mean is the arithmetic average of a group of numbers.
Press
|
{
º
} for the mean of the x–values.
Press
|
{
¸
} for the mean of the y–values.
Press
|
{
·
º
} for the weighted mean of the x–values using the
y
–values as weights or frequencies. The weights can be integers or
non–integers.
Example:
Mean (One Variable).
Production supervisor May Kitt wants to determine the average time that a certain
process takes. She randomly picks six people, observes each one as he or she
carries out the process, and records the time required (in minutes):