【正文】
? Infinite number of cases a continuous distribution ? Area under curve has a probability density = ? Mean of zero, standard deviation of 1 Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Population Distribution ?? x ?????Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Standard Error of the Mean nSx??Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Xcl SZ? E R R O RS A M P L I N G S M A L LCopyright 169。 2022 by Harcourt, Inc. All rights reserved. nSZXcl???Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Sample Size Formula 2???????EzsnCopyright 169。 2022 by Harcourt, Inc. All rights reserved. Sample Size Formula example 2Ezsn ???????? ?? ? 2???????2???????? ?? 202?Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Sample Size for a Proportion 22EpqZn ?Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Standard Error of the Proportion nppornpqps)1( ??Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Sample Size Formula example 2Ezsn ???????? ?? ? 2???????2??????? ? ?? 808?Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Random Sampling Error and Sample Size are Related Copyright 169。 2022 by Harcourt, Inc. All rights reserved. EX ???Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Sampling Distribution XS XX?Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Copyright 169。 2022 by Harcourt, Inc. All rights reserved. A Standardized Normal Curve 0 1 1 2 2 z Copyright 169。 2022 by Harcourt, Inc. All rights reserved. % % % % % Normal Distribution % Copyright 169。 2022 by Harcourt, Inc. All rights reserved. ? The variance is given in squared units ? The standard deviation is the square