Class notes
Frequency Tables and Ogives
- Institution
- Mcdaniel College
Overview of frequency tables and ogives
[Show more]
Seller
Follow
Content preview
Tuesday, 9/3➢ To plan a statistical study:
→ Identify individuals/objects of interest
→ Specify variables and protocols for taking measurements/observations
→ Determine if you will use entire population or representative sample
→ Collect data
→ Use appropriate descriptive statistics methods and make decisions using inferential
statistics
→ Note any concerns/implications of study
➢ Census uses entire population, sample uses part of the population
➢ Block-group of people sharing common characteristics
➢ Randomized block experiment-blocks are created, then the treatment is randomly
assigned to blocks
➢ Placebo effect-subject receives no treatment but falsely believes they are indeed getting
the treatment and respond favorably
Professor went through guided exercise with class
➢ Hidden bias, vague wording, interviewer influence, and voluntary response can all be
pitfalls of a survey
➢ Lurking variable-no data collected for a given variable, but it still influences the study
Professor went through second guided exercise with class, discussing pitfalls of the given
scenarios
Thursday, 9/5
➢ Frequency table partitions data into classes or intervals of equal width; each data value
will fall into exactly one class
➢ Class width: k = (largest data value-smallest data value)/Desired number of classes
→ If k is a whole number, class width is k + 1. If it is a decimal, then round up to next
whole number, no matter what the decimal is
➢ Lower class limit(LCL)-lowest data value that can fit into class
➢ Higher class limit(HCL)-highest data value that can fit into class
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller zdovel29. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
50155 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now