Popular in Elm Statistic Math I
verified elite notetaker
Popular in Math
This 5 page Class Notes was uploaded by Rafferty on Friday December 25, 2015. The Class Notes belongs to STAT 2110 at Bowling Green State University taught by Chris Rump in Fall 2015. Since its upload, it has received 14 views. For similar materials see Elm Statistic Math I in Math at Bowling Green State University.
Reviews for STATS 2110
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 12/25/15
STAT 2110: Elementary Statistical Methods I Homework #1 Chapter 1.1 – Introduction and Graphing Read: pages 3-21 in the Moore et al. textbook. Problems: Page 6.) 1.5 Apartment rentals for students. A data set lists apartments available for students for rent. Information provided includes the monthly rent, whether or not cable is included free of charge, whether or not pets are allowed, the number of bedrooms, and he distance to the campus. Describe the cases in the data set, give the number of variables, and specify whether each variable is categorical or quantitative. Each case in the data set represents an apartment available to rent. There are five (5) variables: 1. monthly rent (quantitative), 2. free cable (categorical as answers would be “yes” or “no”), 3. pets allowed (categorical), 4. number of bedrooms (quantitative), and 5. distance to campus (quantitative). Page 11.) 1.6 Population of Canadian provinces and territories. Here are populations of 13 Canadian provinces and territories based on the 2006 census: a.) Display these data in a bar graph using the alphabetical order of provinces and territories in the table. b.) Use a Pareto chart to display these data. c.) Compare the two graphs. Which do you prefer? Give a reason for your answer. The Pareto chart clearly shows the provinces with the highest populations and allows for better visual discrimination between bars of similar heights. d.) Using the Canadian Population dataset from the previous problem, create a scatterplot of the percentage of residents over 65 vs the percentage below 15. The scatterplot of the percentage of Canadian residents over 65 (Y) vs the percentage below 15 (X) fitted with a quadratic curve (not required) appears below. Notice that Nunavut has – by far – the youngest population followed by NW & Yukon Territories and Alberta. The rest are all clustered around about 14-16% “retirees” and 15-20% “youths”. Page 23.) 1.28 Unemployment rates in Canadian provinces. Here are 2007 unemployment rates for 10 Canadian provinces. a.) Construct a histogram of these rates. b.) Prepare a stemplot of the rates. Stemplot of unemployment, the first with default increments yielding one’s digit leaves (and decimal digit truncated), the second with increment = 1 yielding 1 st decimal place leaves. c.) Discuss the advantages and disadvantages to (a) and (b). Which do you prefer for this set of data? Explain your answer. The histogram has the advantage of being more visually appealing but at the expense of losing the notion of where the data lies within the horizontal bins. The first bin, for example, contains four (4) cases centered around 4%, but only from the first stemplot can you see that one (1) is in 3% range and three (3) are in the 4% range. The second stemplot provides even more accuracy, allowing us to read the precise data in that bin: 3.5%, 4.2%, 4.2% and 4.4%. All three displays allow us to observe right (positive) skewness, although it’s easiest to see in the histogram and the second stemplot. Page 24) 1.29 Vehicle Colors. Vehicle colors differ among types of vehicles. Here are data on the most popular colors in 2007 for the luxury cars and for intermediate-price cars in North America. We plot the categorical variable segment, showing NetSales data values from a table. We display each segment’s percentage of all sales, which is depicted also by the size of each segment’s “slice of the pie.” Minitab Pie Options allowed sorting the segments (not required) as well so that management can quickly see that the first two segments contain more than half of all sales, and the top three account for nearly 75% of sales. The bottom three segments, in contrast, account for about one fifth (20%) of sales.
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'