Stat 201



Stat 201 – Project 1 – Spring 2020Due Monday, February 10th, 2020*(11:59 PM in the evening, submitted to Canvas)*Assignments submitted by *11:59pm on Friday February 7th will receive +7 bonus pointsLate projects should be counted off 15 points per day late. In this project, you will explore a subset (i.e., a sample) of the data collected from haircut tips at a salon! See page 6 for a complete list of the survey questions. You will be including a substantial amount of output within your write-up. INCLUDE ONLY THE OUTPUT NECESSARY TO ANSWER THE PROJECT QUESTIONS. ANY JMP WORK YOU DO TO ANSWER A QUESTION MUST BE INCLUDED AS A SCREENSHOT IN YOUR REPORT.Getting Started: The data are found in the file “Project 1 - Haircut Data.jmp”, which is located on the Stat 201 Webpage under the “Projects” tab. This file contains 232 responses. In real life situations, researchers would use all the data they have available after conducting a survey. For this project, however, you will get JMP to help you take a random sample from the entire data set so that each student will have different results, and therefore will be turning in a UNIQUE project. The size of the random sample must be 100 plus the last two digits of your UT student ID number. For example, if your UT student ID number is 000314791, you will take a random sample of size 100 + 91 = 191. When you create your random sample from the original JMP file, JMP creates a new file that will be named “Subset of Project 1 – Haircut Data.jmp”. You should immediately save a copy of this file by clicking the “File” menu and choosing “Save As…”. JMP will prompt you to keep the same name, which is acceptable, or you can rename it to something like “Stat Project1 – My Data”Taking Screenshots: Although there are many ways to get JMP graphics into a written presentation, we want you to use the “screen shot” method in all cases. Please see the video (Click Here) for instructions on how to take selective screen shots on a PC or a Mac. Clearly label what question and part you are answering so your project is graded correctly! See page 5 for an example project format.Tutorials and Write-up: See the JMP tutorials at and the Stat 201 YouTube Channel Playlist for instructions on how to get JMP to perform most tasks. Throughout the project there are links you can click for video help with JMP. In every question that asks you to produce output from JMP, we expect the output you produce to answer the question to be within the write-up. You should put this output immediately after your comments regarding that specific part of the assignment (i.e., not just a series of printouts from JMP at the back of your write-up). You can get help in the Stat 201 Lab with specific questions about the project. You can NOT ask a Stat 201 Lab worker to read your entire project for suggestions on what to change. Your finished work must be submitted within Canvas (see “Assignments”), and must be a Microsoft Word document (.doc or .docx).Important note for Windows (PC) users: Open JMP, click on the File menu and select Preferences. Then, on the left, select Windows Specific. About three-fourths of the way down this window, where it says Auto Hide Menu and Toolbars, click the drop-down arrow and select Never. Click OK, then close this window. You should only have to do this once, and Mac users do not need to do this.JMP and Hodges Library computers: Using JMP installed on your own computer is much simpler than using JMP on a library computer! If you choose to use a computer in the library to do your project, be sure to first read the document “Using JMP in the Library”, found on the Stat 201 webpage under the “Projects” tab. Also, you will need to save your project and your random sample subset file to a location you can access later, such as a memory stick. Or, you could e-mail these files to yourself for later use.Writing a Good STAT 201 Project Report: Please take note that on page 7 of this document there is a page titled “Writing a Good Stat 201 Project Report”. This page contains a series of guidelines for the written part of your report. A portion of your grade (6%) is related to following these guidelines.Project QuestionsPromptData is used across all industries to make decisions. This semester we have data originally created by Mark Rober! You may know him for his YouTube Channel (Link Here), where he investigates many real-world topics with data! Mark Rober asked his local hairstylist to collect data on their tips along with a few other variables about their customers. The data has been slightly altered so there are a few interesting finds for the project. You will take the role of the hairstylist while completing this project. Your job in this project is to figure out data driven decisions related to the data collected on how you can best optimize your tips and deal with unique situations in your salon. Your opening paragraph will be an executive summary (Video help for creating the executive summary). This will summarize all key findings in the report and should be around 4-6 complete sentences. You will be graded on how the graphics look in the report.Question One – Taking a Random Sample1.Using the full JMP data file, get JMP to select a random sample of size 100 plus the last 2 digits of your student ID number (as described earlier in this document). Report the size of your sample. Save your JMP file, and use it for all remaining questions. (5 points)Question Two – Displaying Univariate Quantitative Data2.a)Let’s start by getting an understanding of how much people are tipping at the salon. Create a histogram to display “Tip Amount”. Make sure your histogram is in horizontal layout, has a count axis, and is properly sized on your report. The video shows how to make a histogram. A stem and leaf plot is not needed in this report. (5 points)b)Discuss the shape of the distribution in a brief paragraph making sure to highlight keywords used in the chapter. (5 points)c)After describing the shape, give the correct measure of center and spread and interpret these measures in context of the variable. Make sure interpretations are written in the way you would speak to someone when reporting the information. (5 points)Question Three – Displaying Univariate Categorical Data3.In this question, you will explore the variable “Day”. Read the full survey question description for this variable (page 6).a)Generate a bar char with the counts above or on the bars. You can include a pie-chart if you want. The only required graphic for this portion is the bar chart. Insert the graphics in your report side-by-side ensuring they are clear and easy to read if you use both graphics. Presentation is important. Use the options on the pie chart to put the legend below the pie chart to save space. (9 points)b)Write a brief description on the frequency of day of the week. For example, when are you doing the most business? When are you doing the least business? (6 points)Question Four – Displaying Bivariate Categorical Data4.In this question, you will explore the relationship between variable “Payment Method” (Y) and “Married” (X). The full survey question descriptions for these variables are on page 6.a)Create a mosaic plot and contingency table for your report. Take note of which variable is Y and X. Use the selection tool to place the contingency table beside the mosaic plot for your report. (10 points)b)Write a brief description on the relationship between the two variables. Make sure to mention the percentages for both conditional distributions. (4 points)c)Use the percentages in your previous description to conclude if there is a relationship between the two variables. Explain the nature of this relationship if it exists. (4 points)Question Five – Displaying Bivariate Quantitative/Categorical Data5.In this question, you will explore the relationship between variable “Tip Amount” (Y) and “Payment Method” (X). The full survey question descriptions for these variables are on page 6.a)Create side-by-side boxplots with the quantiles displayed below. Take note of which variable is Y and X. (10 points)b)Write a brief description on the relationship between the two variables. Make sure to mention the summary statistics for those who pay with a card and those who pay with cash. The summary statistic you choose to compare for center and spread should be based on the shape of the distributions. (4 points)c)Use the summary statistics in your previous description to decide if there is a relationship between the two variables. Explain the nature of this relationship if it exists. (4 points)Question Six – Pivot Chart5.In this question, you will explore the relationship between the mean of “Tip Amount” (Value), “Day” (Row) and “Payment Method” (Column). The full survey question descriptions for these variables are on page 6. The following videos show how to export for a Mac or PC from JMP to Excel.a)Create a pivot chart that displays all three variables. Make sure to include a chart title, axis titles and data table. Round all values in the table to 1 or 2 decimal places. Either choice of rounding will be accepted. (12 points)b)Write a brief description on the relationship between these variables. Make sure to mention which group has the highest average and which has the lowest average. (4 points)c)Use the summary statistics in your previous description to decide if there is a relationship between these variables. Explain the nature of this relationship if it exists. (3 points)Remaining points distribution:Project organization and flow (4 points)Projects should look neat and organized. Use the crop tool in Word if you need to improve screenshots. Your project should read like a report without the prompt of each question.Use of the guidelines on page 7 – (6 points)The opening paragraph on the project should give an executive summary (4-6 sentences) of the analysis they’re about to read. The closing paragraph should summarize interesting finds and discuss any ideas regarding further data collection and analysis. Make sure to use an opening and closing that is relevant to this project and your data.EXAMPLE FORMAT – Showing Question 2STAT 201 Project #1 – Spring 2020 – Learning about CustomersSubmitted by Jane Q. StudentNote: The first 4-6 sentences are an executive summary that go through key findings in your report. It is advised that you write this after finishing your report.Note: The graphic is presented in the report with an easy to read screenshot. Make sure to review how to take screenshots on a Mac or PC.The distribution of Tip Amount is unimodal and very right skewed with many outliers. There are individuals who tipped absolutely nothing all the way up to 40 dollars. The typical tip was the median which was 5 dollars. The interquartile range (IQR) is the appropriate measure of spread due to the skewness. The IQR was 3 which represents the middle 50% of tips ranging from 4 to 7 dollars.Note: Question numbers are left off report. Report is written to the reader and not in the style of a school report.Project Advice1 – The video showing how to use JMP is a hyperlink at the start of each question. Clicking this will bring you to a video showing you how to create the graphic in JMP. Some additional changes might be needed to histograms such as adding a count axis. The full project playlist can be found here.2 – If you have questions, visit stat lab or your professor’s office hours. The schedule for Stat Lab can be found here. The location of Stat lab can be found here.3 – Start the project early. The project has 7 bonus points if you submit it before Friday, February 7th.4 – Do not send an electronic copy of your project to anyone. Do not receive electronic copies of projects from anyone via email or online websites. Doing this is considered cheating. Students suspected of sharing projects will receive a zero on the project and possibly a zero in the course.STAT 201 SURVEYFOR REFERENCE ONLY - FULL TEXT OF QUESTIONS ASKEDTip Amount – The amount in dollars the customer tipped.Time – Time of day customer arrived in military time.Day – Day of the week the customer received their haircut.Payment Method – Did the customer use a card or pay in cash.Married – Is the customer married or not married.Age – The age of the customer. Writing a Good STAT 201 Project Report Writing a report to your boss about a statistical analysis he has asked you to do is very different than writing a novel, or writing to your Statistics instructor. What does it take to write a good project report? Of course, it’s important to know your audience when you write anything.Let’s assume you are writing your project report for some busy executives in the company, and they have asked you to answer the questions in the project. They are very intelligent people, but they are not “Statisticians”. Assume that these executives have had some basic statistical education, but perhaps a long time ago. Keep this in mind as you complete your project.Below are some guidelines for writing an effective project report:1.The first paragraph for the report should be an executive summary. The executive summary should be a 4-6 sentence summary that orients the reader and highlights the key points of the report. The goal of an executive summary is to condense a large report in to just one paragraph.2.Answer each question on the project instructions using correct sentence structure, spelling and grammar. Sentences should be succinct and clear. You can assume the executives have a copy of the questions they asked.3.Avoid using "statistical jargon". Explain the results of the analysis in a way that the executives can understand it.4.As explained in the project instructions, graphics from JMP and/or Excel that address the project question must be imbedded within the document, at the point where the executives need to see them. Don’t make them hunt for the output at the back of your report.5. Avoid including discussion and/or graphics within the report that have no relevance to the question being addressed. 6.For your closing paragraph give information that summarizes your important findings and takeaways. Do not simply restate findings. Inform the reader where you will be going from here after the report.rev. 2019-09-18 ................
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