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Does the brightness of a clothing store change the way people shop?

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They are the shoppers all together, but also the different shoppers on 3 separate weekends

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We will record the amount of sales the stores produced each weekend to see if the lighting of the store affected how the shoppers shopped overall.

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20 clothing stores were picked at random with the approval of the store and the stores that were picked were 2 Tilly's, 6 Nike stores, 9 Walmarts, 3 Hollisters

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On the first weekend we dimmed the lights in all of the stores from open to close. The following weekend we turned the lights all the way up and reached full brightness. The last weekend we turned the brightness to normal brightness as the shoppers shooped

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This is a blind study due to the fact that the shoppers do not know they are being tested in this study

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The explanatory variable would be whether shoppers shopped in the dark or light.

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The stores were chosen at random so there is a variety of types of shoppers. There could be a lurking variable for instance of what type of brightness people tend to like and what they are used to and also if there were any sales going on for one or more of the weekends we tested on.

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The darker the store, there is a decrease in sales. The brighter the store, there is an increase in sales. With the bright lights therefore were about $3000 in sales per store.

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All of the stores are considered a control group due to the fact that the third weekend is regular/normal lighting and is not being changed

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The margin of error is 22.36% which is pretty large, but considering we are looking at 20 stores, we are also looking at thousands of shoppers all together.