{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

chapter 8

# chapter 8 - Handout 10.Inferences in large samples Chapter...

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

1 Statistical inference -drawing conclusions about population parameters from an analysis of the sample data. Types of inference : 1. estimation of parameter(s) -obtain an estimate of the unknown true value along with a determination of its accuracy. a) estimate a single value for the unknown parameter-a point estimate b)determine an interval of plausible values for the unknown parameter- a confidence interval 2. testing of statistical hypotheses -to examine whether the sample data support or contradict the statement about the true value of the parameter. Handout 10.Inferences in large samples. Chapter 8 (8.1-8.3 ) Confidence interval for a population mean. Terminology Parameter : µ or p, the average or the proportion in the population. Estimator (point estimator) : The sample mean or the sample proportion (a general formula,statistic). Estimate (point estimate ) :a number determined from a sample that is used to estimate the corresponding population parameters. Sampling error -the difference between a value (a statistic) computed from a sample and the value of a parameter. Since we seldom know the value of a parameter ,we do not know exactly the size of the sampling error. Standard error S.E – the standard deviation of an estimator Point and Interval Estimates •A point estimate is a single number. confidence interval is based on one sample,but takes into consideration a variation from sample to sample, gives information about closeness to unknown population parameters- stated in terms of level of confidence ,but never 100% confidence.

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 4

chapter 8 - Handout 10.Inferences in large samples Chapter...

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

View Full Document
Ask a homework question - tutors are online