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The table below represents a relationship between 2 variables Q and R connected by the equation Q=aR+b, where a and b are constant. On the grid provided draw the line of best fit for the data. Use your graph to find the value of b.
Mathematics
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Answer
b
Huu hapa ni mwongozo wa kutatua swali hili:
a) Kuchora mstari wa best fit:
- Chora shoka mbili kwenye gridi uliyopewa: shoka ya mlalo (x-axis) kwa na shoka ya wima (y-axis) kwa .
- Weka mizani inayofaa kwa kila shoka. Kwa mfano, kwa , unaweza kutumia mizani kutoka 0 hadi 0.7. Kwa , unaweza kutumia mizani kutoka 0 hadi 7.
- Panga pointi zote zilizotolewa kwenye jedwali kwenye gridi yako:
- Chora mstari ulionyooka unaopita karibu na pointi zote iwezekanavyo. Hakikisha kuna idadi sawa ya pointi juu na chini ya mstari. Panua mstari huu hadi ukate shoka ya .
b) Kutafuta thamani ya kutoka kwenye grafu:
- Mlinganyo uliotolewa ni . Katika mlinganyo huu, inawakilisha Q-intercept (y-intercept), ambayo ni thamani ya wakati .
- Kutoka kwenye grafu uliyochora katika sehemu (a), soma thamani ya ambapo mstari wako wa best fit unakata shoka ya (yaani, ambapo ).
- Kutokana na data iliyotolewa, mstari wa best fit unapaswa kukata shoka ya karibu na 1.96.
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