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Does the type of music played in clothing stores effect the way people shop?

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I went to 3 different shopping malls/centers and into 3 different brand names stores. The  experimental units are the shoppers.

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We asked the stores to play different music while the shoppers shopped to see if the different types of music made customers buy more or less.

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My response variable is how much each person bought from the store.

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The control groups are the 3 different stores. Since we are playing specific music, the revenue of the stores will be dependent on the music played.

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My explanatory variable was the music played in the different stores.

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This experiment has a margin of error of 33% since we are using 3 different stores in 3 different shopping centers.

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I talked to 10 different shoppers in each store (30 people for each mall) and asked them to complete a questionnaire about the stores and why they bought what they bought.

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This experiment can be replicated by doing more research and asking more people to complete the survey to get more of a variety in the answers and to ensure that the results are more accurate.

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This experiment will have a crossover design because we asked 3 of the same name brand stores to participate in this experiment.

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The shoppers will be blind in this experiment and unaware that the type of music was being changed to see if it effected if they purchased anything or not. We cannot have this experiment has a double blind because the stores needed to know in order to change the different music.

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The outcome of the experiment was that the type of music played in the stores changes the way people shop. The results show that the more popular/more current songs caused people to buy more and spend more money.

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I worked it out with the store to offer the people who completed the survey a 10% off coupon for the next time they shop at the store. The people who worked in the store were given their normal payment of minimal wage ($11.75), we also gave the managers a thank you gift of a $20 gift card for letting us use the store in our experiment.
Managers: $20 x 3 x 3=$180

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The increase of sales from when the popular songs were played and when the older/least popular songs were played was $700. Almost every store lost revenue when the older songs were played and when we asked the customers why the didn't buy anything, the majority of them said it was because they were so focused on the songs and not on continue shopping.

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I went to 3 different shopping centers in the valley to ensure that my experiment would not be biased. The lurking variable would be if someone needed something for a special occasion because it wouldn't matter the music in the store.

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I learned that the more popular songs affected the amount of money people spent. The stores revenue increased by 5% or $500 during the time period where more popular music was played. The revenue decreased by 2% or $200 during the time period where less popular or older songs were being played.