8.3 t Test for a Mean - Grant HS Math Dept
8.3 t Test for a Mean
Friday, January 25, 13
Bluman, Chapter 8
1 1
8.3 t Test for a Mean
The t test is a statistical test for the mean of a population and is used when the population is normally or approximately normally distributed, is unknown.
The formula for the t test is
The degrees of freedom are d.f. = n ? 1.
Note: When the degrees of freedom are above 30, some textbooks will tell you to use the nearest table value; however, in this textbook, you should round down to the nearest table value. This is a conservative approach.
Friday, January 25, 13
Bluman, Chapter 8
1 1
Chapter 8 Hypothesis Testing
Section 8-3
Example 8-8 Page #428
Friday, January 25, 13
Bluman, Chapter 8
2 2
Example 8-8: Table F
Find the critical t value for = 0.05 with d.f. = 16 for a righttailed t test.
Find the 0.05 column in the top row and 16 in the left-hand column. The critical t value is +1.746.
Friday, January 25, 13
Bluman, Chapter 8
3 3
Example 8-8: Table F
Find the critical t value for = 0.05 with d.f. = 16 for a righttailed t test.
Find the 0.05 column in the top row and 16 in the left-hand column. The critical t value is +1.746.
Friday, January 25, 13
Bluman, Chapter 8
3 3
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