Statistics

Group project of

Quantitative Studies

Date Submitted: 11/21/2014

Professor: Dr. David Huff

Section 1

Section 1 - Interval Estimates of mean and proportion

Purpose:

1. We want to know what is the 95% confidence interval of the proportion of female students in the University of Windsor.

2. We also want to find the 95% confidence interval of how many times students in the University of Windsor for monthly online purchasing.

Question(s):

1. Your gender: a. Female b. Male

2. How many times you purchase things online monthly?

Method:

Descriptive statistics:

1). For the gender, we will calculate the proportion of male and female and use a pie chart to show the breakdown of men and women

2). For the times of purchasing online, we will calculate

a. Mean, median and mode b. Variance and Standard Deviation

c. Min and Max d. Number of responses

3).Then we use a histogram to show the times of purchasing online.

Interval Estimates:

Using the sample size, sample mean and sample proportion to estimate population parameter and margin of error. (T-score method for mean and Z-score method for proportion)

Results

Data and Descriptive Statistics:

Purchasing times online |

Female | Male |

6 | 15 |

2 | 1 |

5 | 2 |

1 | 1 |

1 | 2 |

2 | 10 |

15 | 10 |

1 | 2 |

1 | 1 |

3 | 0 |

3 | 2 |

2 | 4 |

30 | 6 |

5 | 3 |

4 | 10 |

2 | 1 |

6 | 2 |

6 | 6 |

3 | 1 |

3 | 1 |

1 | 6 |

2 | 20 |

30 | 20 |

2 | 1 |

4 | 1 |

2 | 5 |

5 | 1 |

3 | 1 |

2 |   |

1 |   |

Purchasing times online | |

Mean | 4.965517 |

Standard Error | 0.853081 |

Median | 2 |

Mode | 1 |

Standard Deviation | 6.49687 |

Sample Variance | 42.20932 |

Kurtosis | 6.852822 |

Skewness | 2.58937 |

Range | 30 |

Minimum | 0 |

Maximum | 30 |

Sum | 288 |

Count | 58 |

Confidence Level (95.0%) | 1.708265 |

Notes: According to the female histogram, two...