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Created: Feb 18, 2018
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Results of Coffee Drinker Survey
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Our group aimed to obtain data from coffee drinkers with a survey. We chose to use a convenience sample by posting our survey to social media and sharing it with friends and family. Our target population was adult coffee drinkers. Therefore making it a convenience sample with a voluntary response. 

Our survey questions are as follows:

1. On average, how many cups of coffee do you drink each day?

2. What age did you begin drinking coffee?

3. Do you usually prefer cream in your coffee? Yes or No

4. What type of coffee do you most often drink? Choose only one

   A. Regular (caffeinated)

   B. Decaffeinated

   C. Half-caff (half regular/half decaf)

   D. Other

Looking at Categorical Data:

The responses to the question, "What type of coffee do you most often drink?" are displayed in the following chart. 

Result 1: Pie Chart With Data   [Info]
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As you can see, the majority of respondents (88.6%) answered that they drink Regular (caffeinated) coffee. Only 4.3% responded that they drink Decaffeinated, and 4.3% drank Half-caff. And only 2.5% answered that they drink Other. 

To look at the differences between the types of coffee that people drink who use cream or no cream, we can look at the following bar chart. 


Result 2: Bar Plot With Data   [Info]
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As we can see from this chart, the results between between people who use cream vs those who do not use cream, the results are similar. The majority of both categories reported that they drink Regular (caffeinated) coffee. The lowest numerical value of type of coffee drank for those who do not use cream was for decaffeinated coffee, while the lowest value of type of coffee drank for those who do use cream was for the Other category. 

Looking at a Numerical Variable:

 The data collected for the responses to the question, "How many cups of coffee do you drink per day?" are displayed as a histogram, box plot, and summary statistics below. 


Result 3: Histogram   [Info]
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Result 4: Boxplot   [Info]
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Result 6: Summary Statistics of Data   [Info]
Summary statistics:
ColumnnMeanVarianceStd. dev.Std. err.MedianRangeMinMaxQ1Q3
how many cups4332.46882222.93478961.71312280.08232742621201213

The histogram shows a right skewed distribution, with a majority of the respondents answering that they drink 3 cups of coffee per day. There is a steep drop in the amount of coffee drank after 3 cups, beyond that the numbers gradually decline. There are some outliers from 7-12 cups of coffee. There is also an increase at 9 cups.

The mean of the data is 2.46 cups of coffee per day, and the median is 2.. The mean is greater than the median which would indicate that the data is skewed right. 

The range is 12, and the standard deviation is 1.713. The standard deviation is measured at roughly 1/7 of the range. therefore the standard rule of thumb for standard devation is not satisified, most likely due to the outliers. 

The outliers in this data set are believed to be legitimate data values. The maximum reported was 13 cups of coffee in a day, which could be a real response. 

Looking for a Relationship between Two Numerical Values:

Result 7: Scatter Plot   [Info]
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The scatter plot shows a slight negative trend, with obvious outliers and skewness. The correlation between age of first cup of coffee and amount of cups of coffee drank in a day appears to be negatively related. 

Result 5: Correlation   [Info]
Correlation between how many cups and what age is:

The correlation coefficient also shows that there is a negative relationship amongst the data. 








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