Quantative maths. HELP!!!
Posted: 16/04-2010 22:46
Hei folkens, jeg studerer i london, har eksamen paa tirsdag i quantative maths , kunne noen forklare meg sampling theory? Skjonner ikke baaret. Gjerne forklar : mean, standard deviation ogsaa, siden jeg har skjont at disse ordene kommer igjen og igjen under temaet.
Gaa gjerne utifra denne oppgaven naar du forklarer (kom paa eksamen i 2009)
f.eks her er en oppgave jeg prover aa lose:
A random sample of 400 customers of a mail order clothing company showed a mean value for orders of £43, with standard deviation of £9.45
a) Use the sample data to calculate a 99%error when the sample mean is used as a point estimate for the mean value of all orders recievded by the company, and give the 99% confident interval. Explain the meaning of "level confidence".
Setter stor pris paa hjelp. x
Gaa gjerne utifra denne oppgaven naar du forklarer (kom paa eksamen i 2009)
f.eks her er en oppgave jeg prover aa lose:
A random sample of 400 customers of a mail order clothing company showed a mean value for orders of £43, with standard deviation of £9.45
a) Use the sample data to calculate a 99%error when the sample mean is used as a point estimate for the mean value of all orders recievded by the company, and give the 99% confident interval. Explain the meaning of "level confidence".
Setter stor pris paa hjelp. x