Descriptive Statistics and Interpretation
Descriptive Statistics
Carlos Duran
QNT/561
April 28, 2015
Steven Marantz
Descriptive Statistics Sales (in USD)
Central Tendency: Mean = 42.824 dollars
Dispersion: Standard Deviation = 9.073 dollars
Number: 100
Min/Max: MIN IS $23.00; MAX IS $64.00
Confidence Interval: $1.06 to $44.62
The histogram is present in appendix A; the descriptive statistics are present in appendix B.
Age
Distribution: State if not normally distributed
Central Tendency: Median = 35 years
Dispersion: Interquartile Range = 12 Years / 2 = ± 6 Years
Number: 100
Min/Max: Min is 25 Years; Max is 45 Years
Confidence Interval: The data is not normally distributed, therefore there is no confidence interval.
The histogram is present in appendix A; the descriptive statistics are present in appendix B; the scatterplot relating age sales is appendix C.
ID on Display
34% of the people sampled did not have their ID on display while 66% of people sampled had their ID on display. The bar chart is in appendix E.
Descriptive Statistics Interpretation
Sales
100 people were randomly selected and measured, their sales were observed between $23.00 and $64.00. The average sales were $42.84, with a standard deviation of $9.07. Approximately half or more of the data values are above $42.84. There is enough evidence to say that the population sales amount lies between $41.06 and $44.62 with 95% confidence.
Age
The data is not normally distributed and is skewed to the left 100 people were randomly selected and their ages were measured their ages were between 25 and 45 years with variation of +6 years Half of the people ages lie above 35 years. The middle half of the peoples ages are between 28 and 40 years. The mode or the most frequent age was 25 years.
Appendix A
Sales and Age Histogram
Appendix B
Descriptive statistics on Sales and Age
Appendix C
Scatterplot of Age vs Sales
Appendix D
Sales vs Ages Regression Information
Carlos Duran
QNT/561
April 28, 2015
Steven Marantz
Descriptive Statistics Sales (in USD)
Central Tendency: Mean = 42.824 dollars
Dispersion: Standard Deviation = 9.073 dollars
Number: 100
Min/Max: MIN IS $23.00; MAX IS $64.00
Confidence Interval: $1.06 to $44.62
The histogram is present in appendix A; the descriptive statistics are present in appendix B.
Age
Distribution: State if not normally distributed
Central Tendency: Median = 35 years
Dispersion: Interquartile Range = 12 Years / 2 = ± 6 Years
Number: 100
Min/Max: Min is 25 Years; Max is 45 Years
Confidence Interval: The data is not normally distributed, therefore there is no confidence interval.
The histogram is present in appendix A; the descriptive statistics are present in appendix B; the scatterplot relating age sales is appendix C.
ID on Display
34% of the people sampled did not have their ID on display while 66% of people sampled had their ID on display. The bar chart is in appendix E.
Descriptive Statistics Interpretation
Sales
100 people were randomly selected and measured, their sales were observed between $23.00 and $64.00. The average sales were $42.84, with a standard deviation of $9.07. Approximately half or more of the data values are above $42.84. There is enough evidence to say that the population sales amount lies between $41.06 and $44.62 with 95% confidence.
Age
The data is not normally distributed and is skewed to the left 100 people were randomly selected and their ages were measured their ages were between 25 and 45 years with variation of +6 years Half of the people ages lie above 35 years. The middle half of the peoples ages are between 28 and 40 years. The mode or the most frequent age was 25 years.
Appendix A
Sales and Age Histogram
Appendix B
Descriptive statistics on Sales and Age
Appendix C
Scatterplot of Age vs Sales
Appendix D
Sales vs Ages Regression Information