If a researcher reports a one-sample t-test with df = 24, how many individuals participated in this study

In a randomized block ANOVA, identify the statistic that is used as a measure of variationa. among the sample means for the treatments.b. among the sample means for the blocks.c. within the samples for the treatments with the variation due to blocks removed.

An analysis of variances produces dftotal = 16 and dfwithin = 14. For this analysis, how many treatment conditions are being compared?​

An analysis of variance produces SSb = 40 and MSb = 20.  In this analysis, how many treatment conditions are being compared?

Show the impact of sample size on power?

Acne is a common skin disease that affects most adolescents and can continue into adulthood. A study compared the effectiveness of three acne treatments and a placebo, all in gel form, applied twice daily for 12 weeks. The study's 517 teenage volunteers were randomly assigned to one of the four treatments. Success was assessed as clear or almost clear skin at the end of the 12 week period. The results of the study can be seen in the table below. Using the appropriate statistical test, determine if there is significant evidence that the four treatments perform differently. If so, how do they compare.

If SSBetween = 225.31 and there are four groups in the study with 10 cases per group, MSBetween = :

30.5% of cases fall below what z- score?

Suppose a researcher pbserves a population of 12 people and computes SS=204. What is the variance? What is the standard deviation?

Even if a treatment has no effect, it is still possible to obtain an extreme sample mean that is very different from the population mean. Which outcome is likely if this happens?