800.989.5150

print friendly   Averages, One Sample  |  Averages, Two Samples  |  Percentages, One Sample  |  Percentages, Two Samples One Sample Test Using Average Values One-Tail Test (Hypothesis that Average is greater than some test value or Average is less than some test value, but not both) Two-Tail Test (Hypothesis that Average is not equal to some test value) Enter the average value for the sample and a value to compare it to. Also enter the sample size and standard deviation for the sample or a rough estimates of them. For reference, a 5-pt. scale may typically have a standard deviation of 0.8 to 1.2 and a 10-pt scale may have a standard deviation between 3.0 and 4.0 for most items. The larger the standard deviation, the larger the sampling error. Test Value:  (Value to compare the sample average to) Sample Average:  (Value measured from sample or expected from sample) Sample Size:  (Size of sample or desired number of respondents) Standard Deviation for Sample:    Alpha Error Level or Confidence Level:  1% 2% 2.5% 3% 4% 5% 7.5% 10% 15% 20% (Probability of incorrectly rejecting the null hypothesis that there is no difference in the average values). An Alpha of 5% corresponds to a 95% Confidence Interval.

© 1995-2009 DSS Research. All Rights Reserved.   Request Info  |  Privacy Policy