need12
Jul 20, 2010, 11:09 AM
how to know whether to perform one tailed test or two tailed test ?
in this example:
the average weekly earnings of a worker were $424. To know if wages, on average, have gone up since that time. To test this, you sample 64 production workers, and determine that their average salary is $432.69, with a sample standard deviation of $33.90. Use a 0.05 level of significance .carry out test .
is it t test or z test ? How would we know
is this one tailed or two tailed test
I guess its one tailed test .is that correct?(as it is seeking some increase )
please help me out thanks in advance
in this example:
the average weekly earnings of a worker were $424. To know if wages, on average, have gone up since that time. To test this, you sample 64 production workers, and determine that their average salary is $432.69, with a sample standard deviation of $33.90. Use a 0.05 level of significance .carry out test .
is it t test or z test ? How would we know
is this one tailed or two tailed test
I guess its one tailed test .is that correct?(as it is seeking some increase )
please help me out thanks in advance