STR 1 Pair SW/HW on Hypothesis Testing and Statistical Tests

Answer the following questions on a sheet of pad paper. Refer to the section on Hypothesis Testing and Statistical Tests in your STR manual or to any appropriate reference.

  1. What is a statistical hypothesis?
  2. Differentiate between a null and an alternative hypothesis.
  3. What is a test statistic?
  4. Differentiate between a one-tailed and a two-tailed test.
  5. Differentiate between a Type I error and a Type II error. Which is more acceptable in scientific research? Why? (Hint: Suppose the research is on the effectiveness of a certain leaf extract against pancreatic cancer. Would making a Type I or a Type II error do more harm?)
  6. What is meant by setting the level of significance at 0.05?
  7. Fill in the table showing the differences between the following statistical tests —
Statistical Test How many groups are being compared? What type of variables or measurements are taken? (nominal/ interval/ratio/ordinal) Brief description or example of situations in which the given test may be applied
t-test for independent samples

 

 

 

t-test for correlated samples

 

 

 

analysis of variance (ANOVA )

 

 

 

chi square

 

 

 

Friedman’s test

 

 

 

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s