Questions tagged [mean]

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Compare standard deviations in different samples?

I have some data which you can group based on different variables. I know how to test if they have significantly different means. But what the deviation inside the samples?
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6 views

shifting the mean of an array for bootstrap hypothesis testing

I am trying to understand a textbook exercise I am doing. I have an array of data ...
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90 views

Find variance from 2 variances of 2 datasets with difference sizes

In an attempt to find the mean number of hours his tutorial classmates spent per day preparing for tutorials, John collected data from 10 of his friends in the tutorial group and found that the mean ...
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56 views

dividing Mean by standard Deviation meaning

I have played around with logistic regression a little using movement data intervals that are prelabeled as either resting or active. I now found that if I divide the mean movement of the individual ...
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20 views

mean and variance of a dataset

I have a simple question. Please see the below screenshot : It is from a midterm exam from a university : https://cedar.buffalo.edu/~srihari/CSE555/exams/midterm-solution-2006.pdf My questions is how ...
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591 views

finding the mean for each of the channels (RGB) across an array of images [closed]

How can I find the mean for each of the channels (RGB) across an array of images? For example train_dataset[0]['image'].shape is ...
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102 views

Mean of mean and average [closed]

In order to establish an overall rating for a product from a series of user ratings (from 1 to 5), I thought that the median would be a good idea so that extreme values would not have too much ...
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19 views

How to find a probability distribution the parameters of which do not impact each other like mean and variance in normal distribution do?

I need to find a probability distribution to fit my data. My data has two important features, duration and activity count. Duration means how long one sequence lasts and activity count means the ...