Question about expected frequencies within ranges

  • Context: Undergrad 
  • Thread starter Thread starter chuy52506
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    Frequencies
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Discussion Overview

The discussion revolves around calculating expected frequencies within specified ranges based on observed frequencies and statistical parameters such as mean and standard deviation. The context includes statistical reasoning and methods for estimating expected values in a frequency distribution.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant presents a set of observed frequencies across various ranges and asks how to find the expected frequency for each range.
  • Another participant expresses uncertainty about the method to calculate expected frequencies, indicating a lack of clarity on the topic.
  • A participant acknowledges a previous post indicating that there may not be a satisfactory answer to the question posed.
  • One participant claims to have previously calculated expected frequencies but cannot recall the method used, seeking assistance from others.
  • A later reply emphasizes that without knowing the distribution of observations within a specific range, it is impossible to calculate an expected value for that range.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on how to calculate expected frequencies, with multiple viewpoints expressed regarding the feasibility and methods involved.

Contextual Notes

There are limitations in the discussion, including the lack of information about the distribution of observations within the ranges and the dependence on the assumptions made about the data.

chuy52506
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Say I have ranges:
(-infinity to 16) where the observed frequency is 35
(16 to 18) where the obs freq is 100
(18 to 20) where the obs.. freq. is 360
(20 to 22) where the obs. freq. is 326
(22 to 24) where the obs. freq. is 150
(24 to infinity) where the obs freq is 29

The mean is 20 and standard deviation is 2

How would i find the expected value of each range?
 
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anyone have an idea on how to do this?
 
i meant to ask how to find the expected frequency not value? sorry
 
I saw your post on a previous forum - there is no good answer.
 
yes its possible. I have done it before but forgot the method I used. I was hoping someone knew how to do it.
 
chuy52506 said:
Say I have ranges:
(-infinity to 16) where the observed frequency is 35
(16 to 18) where the obs freq is 100
If all you know is that there are 100 observations between 16 and 18, but do not know where they they lie, you can't calculate an expected value.

(18 to 20) where the obs.. freq. is 360
(20 to 22) where the obs. freq. is 326
(22 to 24) where the obs. freq. is 150
(24 to infinity) where the obs freq is 29

The mean is 20 and standard deviation is 2

How would i find the expected value of each range?
 

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