A5 - Weihan Ni A20252394 MBA 507 Decision Making Assignment...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
A20252394 MBA 507 Decision Making Assignment 1 11.14 a) It’s not a random sample, but perhaps representative; less than 10% all days; more than 10 successes and failures; the 95% confidence interval : ±z*=0.56±1.96=0.56±0.062=(0.498,0.622) b) No, 0.50 is in the interval. If the market is not random, the confidence interval would not include 0.50. c) The significance level is α=0.05; it is a two-tail test based on a 95% confidence interval. 11.22 a) Let p be proportion of bills being paid by medicare. H 0 :p=0.31 H A :p0.31 b) Assume that the sample is representative of the population. 8368<10%, np=8368*0.31>10, nq=8368*0.69>10 c) SD()== = 0.00506, z= = = 1.98, P-value= 2*0.02385=0.048 d) The null hypothesis H 0 is rejeacted at . There is evidence of that p has increased. e) No, the difference is too small, not practical significant. We need look into more data. 11.28 p is the proportion of the damaged goods. H 0 :p=0.02 H A :p>0.02 np=60*0.02=1.2<10 The normal model is not appropriate for this sample distribution. Better not to proceed with a hypothesis test.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/07/2011 for the course ECON 101 taught by Professor Johnson during the Spring '11 term at Sciences Po.

Page1 / 4

A5 - Weihan Ni A20252394 MBA 507 Decision Making Assignment...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online