...TesT Lab Get ready for winter Light bulb fittings energy-saving light bulbs are available in a range of fittings – large screw (e27), small screw (e14), bayonet (b22) and two-pin GU10. For more details go to www.which.co.uk/bulbfeatures The best ways to stay warm, advice on keeping costs down and information on grants and discounts Grants and discounts energy-saving light bulb brands buying bulbs fRee InsuLaTIOn Get free or discounted loft and cavity-wall insulation from suppliers including British Gas, Eon, Npower and Sainsbury’s Energy. Most people are entitled to some help, with the over-70s, low-income households and those on certain benefits getting the best deals – but you need to act now as these offers are set to expire by the end of 2012. Some companies only offer deals to their customers, while others are open to all. For more information go to www.which.co.uk/insulate. OsRaM Tested 14 WInTeR fueL PayMenT Winter comforts Best Buys and advice to save money and keep your home warm O sc Re ty www.which.co.uk ili 28 Which? November 2012 800 LuMens and abOve 1 Ikea Sparsam 15W 301.494.53 £10 15 820 cFL 3 2.10 28 HHHH OsRaM Duluxstar 21W £3 21 650 cFL 3 1.84 0 HHHH HHHH 3 OsRaM Dulux Superstar 30W £11 30 2,000 cFL 4.19 49 £4 £6 20 1,200 cFL 20 1,160 cFL 2.73 2.79 68 60 HHHHH HHHH HHHH HHHH HHHH HHH LuMens and...
Words: 3192 - Pages: 13
...Verjetnost Sluˇajna spremenljivka c Spomnimo se ◮ Vzorˇni prostor S je mnoˇica vseh moˇnih izidov sluˇajnega c z z c poskusa. ◮ Dogodek je podmnoˇica vzorˇnega prostora sluˇajnega z c c poskusa. ◮ Verjetnost je preslikava, ki vsakemu dogodku E vzorˇnega c prostora S priredi neko ˇtevilo P(E ), tako da velja: s P(S) = 1, 0 ≤ P(E ) ≤ 1, P(E1 ∪ E2 ) = P(E1 ) + P(E2 ), ˇe E1 ∩ E2 = ∅. c Gregor Dolinar Uporabna statistika Verjetnost Rezultat sluˇajnega poskusa poskusimo opisati s ˇtevilom. c s Vsakemu moˇnemu izidu priredimo neko realno ˇtevilo. z s Primer Met kovanca. Moˇna izida sta: prednja stran, hrbtna stran. z ˇ prednja stran, izidu priredimo ˇtevilo 1, ˇe hrbtna stran, izidu Ce s c priredimo 0. Igra na sreˇo: ˇe prednja stran, 2 evra dobimo, ˇe hrbtna stran, 2 c c c evra izgubimo. ˇ Ce prednja stran, izidu priredimo ˇtevilo 2, ˇe hrbtna stran, izidu s c priredimo -2. Gregor Dolinar Uporabna statistika Verjetnost Definicija Sluˇajna spremenljivka je preslikava, ki vsakemu moˇnemu izidu c z priredi realno ˇtevilo (poleg tega poznamo tudi verjetnosti moˇnih s z izidov). Definicija ◮ Sluˇajna spremenljivka je diskretna, ˇe je njena zalogo c c vrednosti konˇna ali kveˇjemu ˇtevno neskonˇna. c c s c ◮ Sluˇajna spremenljivka je zvezna, ˇe je njena zalogo vrednosti c c enaka intervalu. Gregor Dolinar Uporabna statistika Verjetnost Diskretno sluˇajno spremenljivko...
Words: 2585 - Pages: 11