Purchase Solution

# Understanding and Calculating Probability Distribution

Not what you're looking for?

A researcher is studying IQ levels. From past experience she knows the population mean IQ for adults is 110 and the standard deviation is 15.

a) If samples of 30 IQs are selected and the sample mean is calculated for each sample, what can be said about the sampling distribution of the sample means, and why?

b) If she takes a sample of 30 adults and measures their IQs , what is the probability that the sample mean will be within 10 points of the possible mean.

c) What is the probability that the sample mean will actually be less than the population mean by more than 5 points?

##### Solution Preview

a) The sampling distribution of the sample means will follow a Normal Distribution across the samples as the underlying parent distribution ...

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.