Sample size, Variance, Standard deviation & Cleaning data

Here is this week’s Class Exercise Woksheet 2: Class Exercise Worksheet 2_ Sample size, Variance, Standard deviation & Cleaning data.docx. Use this worksheet to answer respond to the questions for this weekHere again is the hypothetical data set we worked on last week. 2021 Hypothetical Study Data Sheet for Class work.docx

  1. Look closely at the data in the table. Are there any values that seem to be outliers? How do you know an outlier if you see one?

For this week:

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Assume from the literature one might expect a 20% reduction in Covid hospitalization if Vit D levels are greater than 30. Mean rates of hospitalization at the time of the study were 35 % for Covid positive patients (remember this is before vaccines)

  1. From the statements above identify the 2 groups for which we are trying to compare means and list the groups here:
  1. Here is the link to an online power calculator:

Compare 2 Means 2-Sample, 1-Sided | Power and Sample Size Calculators | HyLown (Links to an external site.)…

From the data given above and posted estimate or calculate the mean of the 2 groups for the variable of interest. To determine the sample size needed to demonstrate a statistically significant difference in hospitalizations and covid 19 positivity rates, enter the means in the calculator. Leave othe default entries. You will need to make up a standard deviation for each of the 2 groups. Report your finding.

  1. Now repeat the process but this time use smaller or larger SD values. Describe what happens to sample size requirements when the SD changes.


  1. Write a sentence or 2 about the relationship of variance to sample size.

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