Chapter 8, Problem 21P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of

a. Compute the power of the test if the researcher uses a sample of *n* = 16 individuals.

b. Compute the power of the test if the researcher uses a sample of *n* = 25 individuals.

a.

To determine

The power of the test if the researcher uses a sample of
n = 16 .

Explanation

**Given info:**

Population mean before treatment is 80, Population mean after treatment is 92, standard deviation is 20, alpha level is 0.05 and sample size is 16.

**Calculation:**

As alpha level is given so before treatment z-score value is calculated as 1.96 using *z* table. Standard error (

Now *X* value before treatment is calculated as:

**b.**

To determine

The power of the test if the researcher uses a sample of
n = 25 .

Sect-8.1 P-1LCSect-8.1 P-2LCSect-8.1 P-3LCSect-8.1 P-1LCASect-8.1 P-2LCASect-8.1 P-3LCASect-8.2 P-1LCSect-8.2 P-2LCSect-8.2 P-3LCSect-8.2 P-4LC

Sect-8.2 P-5LCSect-8.3 P-1LCSect-8.3 P-2LCSect-8.3 P-3LCSect-8.3 P-4LCSect-8.3 P-5LCSect-8.4 P-1LCSect-8.4 P-2LCSect-8.4 P-3LCSect-8.5 P-1LCSect-8.5 P-2LCSect-8.5 P-3LCSect-8.6 P-1LCSect-8.6 P-2LCSect-8.6 P-3LCSect-8.6 P-4LCCh-8 P-1PCh-8 P-2PCh-8 P-3PCh-8 P-4PCh-8 P-5PCh-8 P-6PCh-8 P-7PCh-8 P-8PCh-8 P-9PCh-8 P-10PCh-8 P-11PCh-8 P-12PCh-8 P-13PCh-8 P-14PCh-8 P-15PCh-8 P-16PCh-8 P-17PCh-8 P-18PCh-8 P-19PCh-8 P-20PCh-8 P-21PCh-8 P-1RECh-8 P-2RECh-8 P-3RE

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