Inferential Statistics

Suppose the IQ in a population is normally distributed with a mean of μ = 100 and standard deviation of σ = 15. A scientist wants to know if a new medication affects IQ levels, so she recruits 20 patients to use it for one month and records their IQ levels at the end of the month.

• 1 sample z-test for Mean

• 1 sample t-test for Mean

• 1 sample z-test for Proportion

• 1 sample t-test for Proportion

Suppose we want to know whether or not the mean weight between two different species of turtles is equal.

• Chi-Square Test

• Matched/Paired Sample Test

• 2-sample Independent Test for Mean

• Regression

As a crop researcher, you want to test the effect of three different fertilizer mixtures on crop yield.

• Chi-Square Test

• Matched/Paired Sample Test

• 1-way ANOVA

• Regression

Between a Population and Sample: which size is bigger ?

• Population

• Sample

• Both can be the same

• Not enough information

___________ ___________ is the branch of statistics that involves using a sample to draw conclusion about a population.

(a)  

_____________________ statistics consists of generalizing from samples to populations, performing estimations and hypothesis tests, determining relationships among variables, and making predictions.

• mathematical

• descriptive

• inferential

• population

What is the branch of statistics that involves drawing conclusions about a population based on information contained in a sample taken from that population?

• descriptive statistics

• inferential statistics

• sports statistics

• health statistics

It is a statistical procedure that is used to draw inferences or information about the properties or characteristics by a large group of people, places or things on the basis of the information obtained from a small portion of a large group.

It is concerned with making decisions about a large body of data in the population of interest by using a smaller portion or sample of that population.

(a)  

Techniques used to make conclusions about a large group based on an observation of a small part of the group.

• Statistics

• Descriptive Statistics

• Inferential Methods

• Population parameter

What is the lowest recommended confidence interval one should use to predict the population mean?

• 90%

• 95%

• 50%

• any percentage is fine