parametric data

Question 1

objectives

Answer 1

By the end of the lecture students will:
Define a t-test
Identify when it is appropriate to use three different types of t-tests
Calculate the value of tobt for an independent t-test
Look up critical values and use them to reject or accept a hypothesis.

Question 2

recap

Answer 2

non parametric nom and ord data
parametric ratio interval

Question 3

define Inferential Statistics

Answer 3

1) Procedures for drawing conclusions about a population based on data collected from a sample

2)Help us come to conclusions and make predictions based on the data (i.e., make inferences)
** Based on the sample group it might be able to be generalized to population**

Question 4

Parametric data

Answer 4

Used with
interval data
ratio data
Observations made from a population which are normally distributed
normal curve

Question 5

what is the independent t test

Answer 5

comparing means
control vs experimental means

Question 6

what are 4 criteria for t tests?

Answer 6

Only 2 mean scores being compared

Data must be interval or ratio scale

Data drawn from normally
distributed population

Samples are representative of the population

Question 7

what is degrees of freedom?

Answer 7

Degrees of freedom (df) is defined as:
the number of variables that are free to vary in size
n = # of variables

Question 8

what level of significance

Answer 8

The reference point that is selected for either accepting or rejecting the null hypothesis

Typical values for are
p0.1, p0.05, and 0.01.