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MIS 660 Full Course Discussions GCU
MIS 660 Topic 1 DQ 1
Suppose you wanted to estimate the average household income of all Grand Canyon University (GCU) students. To expedite the process, you only gather household income data from all your friends who major in business at GCU. You then calculate the average income among your friends and report that it represents the average income of all GCU students. Is this a good approach? If not, how would you gather data to derive a better estimate? Explain your answer.
MIS 660 Top ic 1 DQ 2
Income data typically have some outliers. For example, Tim Cook, CEO of Apple, Inc., had a salary of about 400 million in 2011. Suppose you had a data set of incomes in 2011 for all GCU faculty and Tim Cook. Which measure of central tendency would you use when reporting on the incomes in your data set if you do not want outliers to have much effect? Explain your answer.
MIS 660 Topic 2 DQ 1
Suppose you had daily temperature data indicating the “high” point of each day for 2015. If you want to show how the high differs over time, what are some of the plot types that will allow you do this? What are some benefits to binning the data into one of 52 weeks and plotting the average high for each week? Would it make sense to do something similar for the four quarters in the year? Why or why not?
MIS 660 Topic 2 DQ 2
Many times, data are missing because of various reasons. This poses some challenges when doing data analysis. For example, suppose you wanted to do some analysis of the yearly incomes of the faculty at GCU. When asked for their incomes, 25% of the faculty did not participate in the survey; therefore, their incomes are missing from the dataset. How would you summarize the income data in this case? Is it appropriate to ignore the missing incomes and summarize the data without them? Should you estimate the missing incomes, perhaps with the overall average, to complete the data set?
MIS 660 Topic 3 DQ 1
Data summarization is usually not enough when performing analysis. Most of the time, adding context by telling a story about the data is necessary to describe the analysis to others, especially those who are not data-savvy. What are some general guidelines to follow to tell a good data story? What story elements or structure should be used to organize the presentation?
MIS 660 Topic 3 DQ 2
Consider your organization, or an organization you are most familiar with. Explain the general process of data aggregation for a typical metric (e.g., sales revenue, cost per unit, etc.) used in the organization. What specific charts are commonly used to visually depict the data? What might be some areas for improvement regarding how the data is visually presented?
MIS 660 Topic 4 DQ 1
What are some of the limitations of using Excel for pivot tables/charts? Why does that make software like Tableau more appealing in the workplace?
MIS 660 Topic 4 DQ 2
Plotting summarized data will almost always help to convey results more easily. However, there are situations where plotting the summarized data instead of creating a simple table makes data interpretation more difficult. Provide two examples of poor charts/graphs and explain why they are difficult to interpret.
MIS 660 Topic 5 DQ 1
Data is useless without the skills to manipulate, summarize, and analyze it. In fact, even after data is summarized into a reporting format such as graphs and tables, it still requires someone to add context and describe the results to fully explain the data. This can be difficult, especially if data is being presented to nontechnical individuals. Describe two techniques that can be used to better describe analysis results to nontechnical individuals.
MIS 660 Topic 5 DQ 2
When most people think about data reporting or visualization, they think about a nicely crafted graph that will not be interactive with a user. Some new tools, such as Tableau, can create visualizations that can interact with a user with informative pop-up information, more drill-down information, and the ability to export filtered results. Describe two benefits to having a user interact with a standard report. Are there any drawbacks if the user modifies the report?
MIS 660 Topic 6 DQ 1
Summarize key data distribution concepts including probability mass functions (PMF), probability density functions (PDF), and cumulative distribution functions (CDF). Based on your organization or any organization you are most familiar with, provide an example of a PMF, an example of a PDF, and an example of a CDF, based on the type of data used in the organization. How would you summarize each of these to someone who is not familiar with each of these functions?
MIS 660 Topic 6 DQ 2
Suppose you had a six-sided die where each number (1, 2, 3, 4, 5, and 6) has the same probability of showing up (1/6). If the die is rolled an infinite number of times and the number recorded, what will be the average value that shows up? Is the average value one of the actual possibilities (1, 2, 3, 4, 5, or 6)? Why or why not?
MIS 660 Topic 7 DQ 1
Suppose you wanted to understand the relationship between a customer’s yearly income (X) and the number of movies (Y) the customer watched in a year. You then gather data on incomes and the number of movies watched in a year. The range of incomes in your data set is $5K to $150K. After fitting a simple linear model and performing all the appropriate diagnostics, the model showed that, on average, for every $10K in income, the customer watched 1.5 movies in the year. So, for example, if a customer earned 60K in a year, he or she would be expected to watch nine movies during the year. Now you want to apply this model to your very wealthy friend who will earn $1 million in the next year. Is this an appropriate application of your model? Why or why not? Provide specific examples to justify your opinion.
MIS 660 Topic 7 DQ 2
If you regress daily high temperature (Y) on the amount of ice cream sales (X), you will notice that there is a strong positive correlation between the two. In other words, as daily ice cream sales increase, the daily high temperature increases. This implies that if we knew the amount of ice cream sales in a particular day, we could estimate, with a high level of accuracy, the high temperature in that day. Does this mean that if we wanted to increase the daily temperature, we need to sell more ice cream? Explain why or why not?
MIS 660 Topic 8 DQ 1
Suppose you were asked to investigate which predictors explain the number of minutes that 10- to18-year-old students spend on Twitter. To do so, you build a linear regression model with Twitter usage (Y) measured as the number of minutes per week. The four predictors you include in the model are Height, Weight, Grade Level, and Age of each student. You build four simple linear regression models with Y regressed separately on each predictor, and each predictor is statistically significant. Then you build a multiple linear regression model with Y regressed on all four predictors, but only one predictor, Age, is statistically significant, and the others are not. What is likely going on among the four predictors? If you include more than one of these predictors in the model, what are some problems that can result?
MIS 660 Topic 8 DQ 2
After building a regression model and performing residual diagnostics, you notice that the errors show severe departures from normality and appear to have nonconstant variance. What steps would you take in this case to resolve the errors? If the problems are not corrected after all steps are taken, what does that imply about the modeling approach you are taking? Explain in detail.
MIS 660 Full Course Discussions GCU
ACCT 553 DeVry, BIAM 500 DeVry, CIS 500 STR, CIS 558 STR, ENG 105 GCU, FIN 390 DeVry, FIN 504 GCU, HCA 545 GCU, HCA 699 GCU, HLT 306 GCU, HLT 362 GCU, HLT 555 GCU, HLT 610 GCU, HLT 665 GCU, HOSP 594 DeVry, HRM 600 DeVry, MAT 144 GCU, MGMT 600, MGT 599 STR, MGT 655 GCU, MKT 373 GCU, PSY 362 GCU, PSY 565 GCU, PSY 575 GCU, PSY 665 GCU, SOC 102 GCU, SOC 320 GCU, SOC 372 GCU, SOC 412 GCU, NSG 6440 SU, HIM 515 GCU, NSG 4029 SU, HIM 615 GCU, NSG 3029 SU, NSG 4055 SU, NSG 6630 SU, NSG 6005 SU, CRMJ 310, PSY 510 GCU, CRMJ 300 Devry, CRMJ 425, SPD 200 GCU, HLT 490 GCU ,ECH 340 GCU , ECH 440 GCU , ECH 355 GCU ,ECH 350 GCU ,LDR 461 GCU ,ECH 425 GCU ,REL 212 STR ,SCI 115 STR ,CIS 505 STR ,JUS 652 GCU, MGT 640 GCU, CIS 527 STR, SOC 436 GCU,ACC 502 GCU, FIN 504 GCU , MATH 260 DeVry ,ETHC 445 DeVry ,ECET 220 DeVry , CARD 405 DeVry, NETW 203 DeVry, NETW 205 DeVry, ECET 365 DeVry ,MATH 270 DeVry ,PHYS 310 DeVry, BIB 106 GCU ,CIS 512 STR ,SYM 506 GCU ,ECN 601 GCU ,BIAM 570 DeVry, PSY 402 GCU , SOC 480 GCU , BIAM 530 DeVry, DNP 810 GCU , DNP 820 GCU , DNP 825 GCU , ECN 450 GCU , DNP 830 GCU , LDR 804 GCU , MAT 105 GCU , ECS 501 GCU , ECS 555 GCU , TSL 552 GCU , ECS 560 GCU , NRS 493 GCU , ECS 570 GCU , BUS 352 GCU , MIS 660 GCU
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