Sync_Day_Review_Exam3_3250

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University of Florida *

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3025

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Statistics

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Apr 3, 2024

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Exam 3 – The Twenty Practice Questions Questions 1 – 5 Multiple Choice 1. What would result in a smoother trend? a. SES alpha = .2 b. SES alpha = .4 2. Find the forecast value for time period 6 using SMA(3) noncentered. day 1 2 3 4 5 sales 100 125 115 135 132 a.) 127.3 b.) 63.6 c.) 133.5 d.) 121.4 3. By hand, find the smoothed value for time period 2 using SES (alpha = 0.2) day 1 2 3 4 5 sales 100 125 115 135 132 a.) 100 b.) 105 c.) 110 d.) 115 4. Which method is good at modeling seasonal trends? a.) Simple moving averages b.) Simple exponential c.) Autoregressive models d.) Additive models 5. Which of the following is a time series? a.) Sales at each McDonalds in the SE today b.) Wait time at a traffic light for 20 cars c.) The daily sales total recorded for a month d.) Weight of cats that visit the vet this week

Questions 6 – 8 You are interested in determining if there is a difference in the tips between three different age groups of customers. There are 15 customers in each group. You notice that there is an outlier in one of the samples. 6. What type of test should you conduct? a.) Wilcoxon Sum Rank Test b.) Wilcoxon Sign Rank Test c.) Kruskall Wallace d.) Spearman’s Rank 7. What would be the appropriate null hypothesis? a.) All the population means are equal. b.) All the population proportions are equal. c.) All the population medians are equal. d.) At least one of the counts is greater than 5. 8. The Kruskall Wallace test statistics (H) is equal to 3.4. What is the p-value? a.) 0.1827 b.) 0.3340 c.) 0.3765 d.) 0.4023 Questions 9 – 10 You are interested in determining if there is a difference in the tips between three different areas of town. There are 15 customers in each group. There are no outliers. 9. What type of test should you conduct? a.) One Way ANOVA b.) Two Way ANOVA c.) Kruskall Wallace d.) Spearman’s Rank 10. What would be the degrees of freedom for error? a.) df 1 = 3 df 2 = 15 b.) df 1 = 2 df 2 = 45 c.) df 1 = 2 df 2 = 42 d.) df 1 = 3 df 2 = 45

Questions 11 – 15 Multiple Choice 11. A consumer watch group wants to see if miles traveled on the battery for a hybrid car is affected by the length of the daily commute ( 0-15 minutes, 15-30 minutes, 30 – 45 minutes, more than 45 minutes). What type of test should you conduct? a. 2 independent sample means b. 1 factor ANOVA c. 4 factor ANOVA e. 2 factor ANOVA 12. Using the Bonferroni Method, if you were to make 10 comparisons and you were to have a familywise error rate of 0.05, what would be the error rate for each comparison? a.) 0.005 b.) 0.05 c.) 0.01 d.) 0.50 13. If Kendall’s tau equals 1, what does this indicate? a.) The points follow a perfect line in the positive direction. b.) The points follow a perfect line in the negative direction. c.) Each pair of points (in a single stream) have a positive slope between them. d.) Each pair of points (in a single stream) have a negative slope between them. 14. Which of the following is not a characteristic of Big Data? a.) Volume b.) Velocity c.) Variety d.) Veracity e.) Valor 15. What type of machine language technique would be used to answer this question? What percent of current UF students plan have a gpa between 3.4 and 3.5 and are in the College of Business? a) OLAP b) Regression Problem c) Classification Problem

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Questions 16 - 19 There are three Mexican places to eat in Bedford City, Florida. Is there a difference in the food ratings? See the below table. Rank the highest as “1”. Place 1 Place 2 Place 3 Rater 1 8 9 9 Rater 2 7 4 6 Rater 3 9 7 8 Rater 4 9 8 7 16. What is the appropriate null hypothesis? a.) All the means are the same. b.) All the medians are the same. c.) All the medians are different. d.) All the means are the same. 17. What is the sum of the ranks for place 1? _____________ 18. The test statistic equals 1.625. What is the p-value? ____________ 19. What is an assumption of this test? a.) The data must be normally distributed. b.) The data must be auto correlated. c.) The data must be numeric. d.) There must be five successes and five failures. 20. What type of test is this? a.) One Way ANOVA b.) Kruskal Wallace c.) Wilcoxon Sign Rank Test d.) Friedman’s Rank Test