Problem 4E

Six measurements were made of the concentration (in percent) of ash in a certain variety of spinach. The sample mean was 19.35 and the sample standard deviation was 0.577. Assume that the concentrations are normally distributed.

a. Find a 90% prediction interval for a single measurement.

b. Find a tolerance interval for the pH that includes 99% of the measurements with 95% confidence.

Psych Statistics – Book Notes Chapter 1 Statistics consists of a set of procedures for organizing, describing, and interpreting quantitative information and for drawing conclusions/making inferences about what is generally true for an entire group. Scientific Use Almost all numerical information, or data, in the social/behavioral sciences contain variability. o Variability refers to the fact that the scores/measurement values obtained in a study differ from one another, even when all subjects are assessed under the same circumstances. 1) Individual Differences The units (usually people) are rarely identical to one