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what is the difference between an independent variable and dependent variable?
An independent variable is manipulated to observe its effect on a dependent variable, which is measured in response to changes in the independent variable.
Increasing confidence level increases ________-
margin of error
decreasing confidence level decreases ______
margin of error
two tailed critical values from the standard of norm table are:
2.576 for a = 0.01
1.96 for a = 0.05
1.645 for a = 0.10
confidence intervals to calculate
99% = 2.576
95% = 1.96
90% = 1.645
an F stat must always be _____
positive