Walden STAT3001 Week 2 Project Latest 2020 January

STAT3001 Statistical Methods and Applications

Week 2 Project

Instructions:  To complete this project, you will need the following materials:

•             STATDISK User Manual (found in the classroom in DocSharing)

•             Access to the Internet to download the STATDISK program.

Part I.  Histograms and Frequency Tables

Instructions         Answers

1.            Open the file Freshmen 15  using menu option Datasets and then Elementary Stats, 13th Edition.  This file contains data on sex, weight (in kg) and BMI in September and April of college freshmen.  What are the names of the variables in this file?

               The variables of interest includes BMI for both the months of September and April, Weights for both months and the sex of the freshmen

2.            Create a histogram for the weight in September (column 2) using the Auto-fit option.  Paste the chart here. Once your histogram displays, click Turn on Labels to get the height of the bars.      

3.            Using the information in the above histogram, complete this table.  Be sure to estimate the range of heights for each bar as well as the frequency, relative frequency, and cumulative frequency                Depth    Frequency

a.            Using the frequency table above, how many of the freshmen had a weight of less than 64.9 kg or less?  How do you know?        

b.            Using the frequency table above, how many of the freshmen weighed between 55 and 74.9 kg?  Show your work.     

c.            What percent of the freshman have a weight of 75kg or more?     

Part II.  Comparing Datasets

Instructions        

1.            Create a boxplot that compares the weight in September and April.  (Columns 2 and 3) Paste it here.     

2.            Describe the similarities and differences in the data sets.  Please be specific to the graph created. You might compare the percentiles, range, and median.  

Part III.  Finding Descriptive Numbers

3.            Open the file named Word Counts (using Datasets and then Elementary Stats, 13th Edition).  This gives information on the word count of different age groups for male and female psychology students.  List all the variables in the dataset.       

4.            Find the Mean, median, and midrange for the Data in Column 3.   

5.            Find the Range, variance, and standard deviation for Column 3.    

6.            List any values for column 3 that you think may be outliers.  Why do you think that?

[Hint:  You may want to sort the data and look at the smallest and largest values.]

7.            Find the Mean, median, and midrange for the data in Column 4.

 8.           Find the Range, variance, and standard deviation for the data in Column 4.              

9.            List any values for column 4 that you think may be outliers.  Why do you think that?

10.         Find the five-number summary for the number of words data in Columns 3 and 4. You will need to label each of the columns with an appropriate measure in the top row for clarity. (Refer to page 167 in the text.)                    

11.         Compare the number of words for females and males using a boxplot of Columns 3 and 4.  Paste your boxplot here 

12.         Create a histogram for the Column 3 data.

13.         Create a histogram for the Column 4 data.

Part IV.  Interpreting Statistical Information

The Word Count by Males and Females contains the count of the number of words spoken in a day by males and females in six different age groups.

Group A:  Column 3 contains the number of words spoken in a day for male student’s age 17 to 25 in introductory psychology classes in Mexico

Group B:  Column 4 contains the number of words spoken in a day for female student’s age 17 to 25 in introductory psychology classes in Mexico

Using the descriptive statistics found above, what conclusions can you make comparing the number of words spoken in Group A with Group B? You want to address EACH of the following points below.  Please be sure to use SPECIFIC values to support your reasoning (hint: you may want to consider the descriptive statistics found in Part III as well as the histograms). You must justify your conclusions with Stat Disk output from Part III of this project for each portion below.

a.            One conclusion about a measure of center (mean, median, midrange).

b.            One conclusion about the variability in the two datasets (variance, standard deviation, range)

c.            One conclusion about the shape of the distribution (mention direction of skew and relationship of the mean and median).

Submit your final draft of your Word file by going to Week 2, Project, and follow the directions under Week 2 Assignment 2. Please use the naming convention "WK2Assgn2+first initial+last name" as the Submission Title.