The net weights (in grams) of a sample of bottles filled by a machine manufactured by Edne, and the net weights of a sample filled by a similar machine manufactured by Orno, Inc., are: 
Testing the claim at the 0.05 level that the mean weight of the bottles filled by the Orno machine is greater than the mean weight of the bottles filled by the Edne machine, what is the critical value oft? Assume equal standard deviations for both samples.
Definitions:
Variables
Elements, features, or factors that can be changed and measured in scientific research to determine their effects on the outcomes of the research.
Reliable Test
A test that consistently produces the same results over time when given in the same conditions.
Validity
The extent to which a test or instrument measures what it is supposed to measure.
Internal Consistency
The degree to which items in a psychological test measure the same construct, indicating the reliability of the test.
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