My aim is to study the nature of length of stay of vechicles in a parking lot. A day is split to 3 sessions namely Morning - 10am to 2pm, Afternoon - 2 pm to 6 pm, Evening 6pm to 10pm. Given the In time and Out time of a sample size of 9000 vechicles, I need to statistically prove whether there is a significant difference between the average length of stay between the 3 sessions of a day.

I tabulated the time (in minutes) each vechicle spends in the parking lot for each session of the day and my data looked like this below.

Now to perform one-way ANOVA, I have a confusion whether I have to consider the records without zeros (image marked 1) or with zeros (image marked 2). Kindly requesting

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