umuc STAT200 Quiz-1 covers material for week 1
STAT200 Quiz-1 covers material for week 1 and week 2.Show steps of solutions, not just answers.1. Let’s say you have a list of all people who work for the company.Describe how you would select a sample of people from this company usinga) systematic samplingb) stratified sampling technique. 2. What’s the difference between Descriptive and Inferential Statistics?3. Present following data in Steam and Leaf display: 32, 54, 28, 22, 18, 65, 44, 31, 52, 48, 32, 35, 37, 45, 33. 4. Based on the Box Plots below, answer the following questions:a) what set of data has bigger Interquartile Range (IQR)?b) between what numbers (roughly) are low 25% results for Male?c) between what numbers (roughly) are top 25% results for Female? 5. Find Median for each of the following number collections:A) 10, 14, 25, 30, 18, 16, 20;B) 23, 12, 34, 44, 30, 50, 55, 60 6. Find Quartiles Q1, Q2 and Q3 and Interquartile Range for the following number collection:8, 12, 14, 15, 18, 20, 21, 24, 27, 30, 33, 35 7. Calculate Sample Standard Deviation for the following data collection:11, 18, 21, 29, 33, 38 8. Find 90th percentile for the following data collection:2, 7, 10, 12, 14, 16, 20, 22, 27, 30, 34, 40, 48, 50, 60. 9. Find percentile for the number 14 in this data collection:2, 7, 10, 12, 14, 16, 20, 22, 27, 30, 34, 40, 48, 50, 60. 10. Calculate the Mean for the given Grouped Frequency Table:Interval10 – 2020 – 3030 – 4040 – 5050 – 60 Frequency4812106 Tip: See example in Illowsky textbook, Chapter 2, page 102:Calculating the Mean of Grouped Frequency Tables.
