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10/5/2018 Week 1: Homework: Statistics for Decision-Making - 10586 WEEK 1: HOMEWORK Due Oct 6 at 11:59pm Points 40 Questions 20 Available Sep 2 at 12am - Oct 27 at 11:59pm about 2 months Allowed Attempts Unlimited Time Limit None Instructions Click here to work on the homework set. You can re-do this assignment as often as you need. Be sure to have the Week 1 Excel spreadsheet available to help with the calculations. It is provided in Week 1: Resources. Take the Quiz Again Attempt History Attempt Time Score KEPT Attempt 1 66 minutes 31.2 out of 40 LATEST Attempt 2 46 minutes 22 out of 40 Attempt 1 66 minutes 31.2 out of 40 Correct answers are hidden. Score for this attempt: 22 out of 40 Submitted Sep 20 at 7:36pm This attempt took 46 minutes. Question 1 2 / 2 pts A recent survey of the alumni of a university indicated that the average salary of 10,000 of its 200,000 graduates was $130,000. The $130,000 would be considered a: Top Population Parameter https://devryu.instructure.com/courses/31509/quizzes/96257?module_item_id=3911997 1/11 10/5/2018 Week 1: Homework: Statistics for Decision-Making - 10586 Sample Statistic Question 2 2 / 2 pts In a survey of 1000 adults, 34% found they prefer charcoal to gas grills. The 1000 would be considered a: Population Parameter Sample Statistic Incorrect Question 3 0 / 2 pts The average age of students in a statistics class is 28 years. The 28 years would be considered an example of: A population Inferential statistics Descriptive statistics Top Qualitative data https://devryu.instructure.com/courses/31509/quizzes/96257?module_item_id=3911997 2/11 10/5/2018 Incorrect Week 1: Homework: Statistics for Decision-Making - 10586 Question 4 0 / 2 pts The milligrams of tar in 30 cigarettes would be considered: Ratio data Nominal data Ordinal data Interval data Question 5 2 / 2 pts Marriage status (married, single, etc.) of the faculty at a university would be considered: Ratio data Ordinal data Qualitative data Quantitative data Question 6 2 / 2 pts Top(for example, Asian, European, etc.) listed in a recent The nationalities survey would be considered: Ratio data https://devryu.instructure.com/courses/31509/quizzes/96257?module_item_id=3911997 3/11 10/5/2018 Week 1: Homework: Statistics for Decision-Making - 10586 Nominal data Interval data Ordinal data Question 7 2 / 2 pts Five statistics classes out of 20 are selected and all the students in the selected classes are interviewed. This sampling technique is called: Random Convenience Cluster Stratified Incorrect Question 8 0 / 2 pts A researcher obtained a random sample of 100 smokers and a random sample of 100 non-smokers. After interviewing all 200 participants, the researcher compared the rates of depression between the two groups. This study design would be considered: Observational Top Experimental Simulation https://devryu.instructure.com/courses/31509/quizzes/96257?module_item_id=3911997 4/11 10/5/2018 Week 1: Homework: Statistics for Decision-Making - 10586 Survey Question 9 2 / 2 pts Which of the following would be the mean of this data set: 5, 28, 12, 56, 4, 2, 30, 21 19.75 16.50 18.24 17.06 Question 10 2 / 2 pts Which of the following would be the standard deviation of this sample data set: 67, 54, 30, 77, 92, 41, 75, 81 64.6 517.0 21.2 19.9 Top Question 11 https://devryu.instructure.com/courses/31509/quizzes/96257?module_item_id=3911997 2 / 2 pts 5/11 10/5/2018 Week 1: Homework: Statistics for Decision-Making - 10586 Which of the following would be the variance of this population data set: 3, 6, 8, 9, 4, 5, 7, 1, 9, 7, 5, 4, 13, 9 12.00 9.49 2.97 8.82 Incorrect Question 12 0 / 2 pts What is the relationship between variance and standard deviation? Variance is the square of the standard deviation Standard deviation is the square of the variance Variance is double the standard deviation Standard deviation is double the variance Incorrect Question 13 0 / 2 pts If data set A has a smaller standard deviation than data set B, what would be different about their distributions? Top Data set A would have more data near the center of the distribution Data set A would have most of its data to one side of the distribution https://devryu.instructure.com/courses/31509/quizzes/96257?module_item_id=3911997 6/11 10/5/2018 Week 1: Homework: Statistics for Decision-Making - 10586 Data set A would have flatter distribution with more data in each tail Data set A would have a larger mean Question 14 2 / 2 pts In a normally distributed data set with a mean of 24 and a standard deviation of 4.2, what percentage of the data would be between 19.8 and 28.2 and why? 68% based on the Empirical Rule 95% based on the histogram 68% based on the histogram 95% based on the Empirical Rule Incorrect Question 15 0 / 2 pts Which of the following data sets would you expect to have the highest standard deviation? Speed of cars during a professional car race (in mph) Ages of kids in a preschool program (in years) Prices of used cars (in dollars) Top Height of pit bulls (in inches) https://devryu.instructure.com/courses/31509/quizzes/96257?module_item_id=3911997 7/11 10/5/2018 Incorrect Week 1: Homework: Statistics for Decision-Making - 10586 Question 16 0 / 2 pts Which data outcome of the number of customers in line would best support opening another cash register? High mean with high standard deviation Low mean with high standard deviation High mean with small standard deviation Low mean with small standard deviation Incorrect Question 17 0 / 2 pts In manufacturing, cluster sampling could be used to determine if the machines are operating correctly. Which of the following best describes this type of sampling? Samples are randomly selected throughout the day Products are put into groups and some are randomly selected from each group Products are put into groups and all are included from several randomly selected groups Topproduct in the line is selected Every 10th https://devryu.instructure.com/courses/31509/quizzes/96257?module_item_id=3911997 8/11 10/5/2018 Incorrect Week 1: Homework: Statistics for Decision-Making - 10586 0 / 2 pts Question 18 A graph shows vertical bars with the number of data points on the y-axis and groups on the x-axis. This graphic is most likely to be: A dot plot A stem-leaf plot A frequency histogram A frequency polygon 2 / 2 pts Question 19 Match the terms and their definitions Vertical bar chart that Histogram shows frequency on the yaxis A sample where the population is divided into Cluster sample groups and several groups are randomly selected from all from those selected groups are sampled Collection of all counts Popula on that are of interest Top A subset or part of a population Sample https://devryu.instructure.com/courses/31509/quizzes/96257?module_item_id=3911997 9/11 10/5/2018 Week 1: Homework: Statistics for Decision-Making - 10586 A sample where the Stra ﬁed sample population is divided into groups and several are randomly sampled form each group Consists of attributes, Qualita ve data labels, or nonnumerical entries 2 / 2 pts Question 20 Match the terms and their definitions The most frequent number Mode appearing in a dataset The average Mean The percentage of data Empirical Rule that falls within 1, 2, or 3 standard deviations of the mean in a symmetrical, bell-shaped distribution The square root of the Standard devia on variance Show how far a particular data point is from the Standard score mean in terms of the Top number of standard deviations https://devryu.instructure.com/courses/31509/quizzes/96257?module_item_id=3911997 10/11 10/5/2018 Week 1: Homework: Statistics for Decision-Making - 10586 Quiz Score: 22 out of 40 Top https://devryu.instructure.com/courses/31509/quizzes/96257?module_item_id=3911997 11/11