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Statistische bewerkingen
41
Opmerking: bij één variabele en één variabele gewogen zijn er geen items voor
y
.
Voor een voorbeeld waarin het menu Stats wordt gebruikt, raadpleegt u tabel 3.1
en 3.2. In dit voorbeeld is RPN de actieve bewerkingsmodus.
De verkopen van de laatste vijf maanden worden aangegeven door de
onderstaande waardeparen, waarbij
x
het nummer van de maand aangeeft
en
y
de verkoopwaarden. Voer deze in in het menu Data. Met behulp van het
menu Stats voor
Predictions
voorspelt u de verkoop voor maand zeven. Wat
is de hellingsgraad en y-intercept van de lineaire regressielijn? Wat is de
som van alle y-waarden?
Tabel 3.1 Maanden en verkoopcijfers
Maand Verkoopcijfers
1 150
2 165
3 160
4 175
5 170
41


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