Refer to Exercise 34. Describe the pooled t test fortesting H0: m1 2 m2 5 D0 when both population distributionsare normal with s1 5 s2. Then use this test procedureto test the hypotheses suggested in Exercise 33
Population is the entire collection of items of interest Parameter is a numerical value associated with population Census is a measurement obtained by every unit in a population Sample is a small part of the population meant to show patterns of the whole population Simple Random Sample (SRS) everyone has en equal chance of being selected for a sample Self Selected Sample (volunteer sample) you chose to participate Statistic is a piece of data from a study of a quantity of numerical data Sampling error is an error that comes from a random fluctuation Non-sampling error is when data is collected, recorded or analyzed incorrectly Types of variable 1. Qualitative or categorical (non numerical data) a. Nominal- 2 or more categories with no intrinsic ordering to the
