summarizing data numerically‚ including presentation of data in tables and calculation of statistics for central tendency‚ variability‚ and distribution. Methods are also presented for displaying data graphically‚ including line graphs‚ bar graphs‚ histograms‚ and frequency polygons. The description and graphing of study data result in better analysis and presentation of data. © Index terms: Data analysis Statistical analysis Published online before print 10.1148/radiol.2253012154 Radiology 2002;
Premium Median Standard deviation Normal distribution
HONORS STATISTICS CH1 In an observational study‚ researchers simply observe characteristics and take measurements‚ as in a sample survey. In a designed experiment‚ researchers impose treatments and controls and then observe characteristics and take measurements. Data from a sample of citizens of a certain country yielded the following estimates of average TV viewing time per month for all the citizens. Answer: Inferential‚ because the statistics are used to make inference about the
Premium Arithmetic mean Standard deviation Median
Chapter 2 Study Guide MULTIPLE CHOICE QUESTIONS 1. The relative frequency of a class is computed by a. dividing the midpoint of the class by the sample size b. dividing the frequency of the class by the midpoint c. dividing the sample size by the frequency of the class d. dividing the frequency of the class by the sample size Answer: d 3. The sum of frequencies for all classes will always equal a. 1 b. the number of elements in a data set c. the number of classes d. a
Premium Frequency distribution Frequency
summaries are used for numeric data or for qualitative data. 2. Construct a frequency table‚ bar graph and pie chart for qualitative data. 3. Convert raw data into a data array. 4. Construct frequency table‚ relative and cumulative frequency tables‚ histogram‚ and ogive for quantitative data. 5. Construct a stem-and-leaf display to represent quantitative data. A. Summarizing Qualitative Data (2.1) 1. Introduction: Data are usually collected‚ entered‚ and saved into some form of database.
Free Frequency distribution Frequency Summary statistics
MAT 308 Name:___________________________ Chp 1-2 Test 100 points In order to receive full credit‚ please show all work for every problem. You are welcome to use your calculator‚ book and notes‚ but please take this test on your own. 1. In your own words‚ explain what parameters and statistics are and what the difference is between them. Give an example to clarify. (10 points) 2. According to Consumer Reports‚ a random sample of 35 new cars gave an average of 21.1 mpg
Premium Frequency distribution Scientific method Frequency
Delta Plastics‚ Inc. Delta Plastics‚ is a company that designs and manufactures plastic containers for household and kitchen use. The R&D group working for Delta is constantly thinking of new ways to develop‚ design and produce new plastic materials for the company. The new containers that the R&D group is currently working on are designed to be able to be removed from the oven and immediately stored in the refrigerator if necessary‚ with no wait time to cool. The group will be looking to see
Premium Plastic Management
you to master several techniques for summarizing and depicting data‚ thereby enabling you to: 1. Recognize the difference between grouped and ungrouped data. 2. Construct a frequency distribution. 3. Construct a histogram‚ a frequency polygon‚ an ogive‚ a pie chart‚ a stem and leaf plot‚ a Pareto chart‚ and a scatter plot. CHAPTER TEACHING STRATEGY Chapter 1 brought to the attention of students the wide variety and amount of data available in the
Premium Frequency distribution Harshad number Prime number
qualitative variable in graphic form is a bar chart. In PIE CHART A chart that shows the proportion or percent that each class represents of the total number of frequencies. A histogram for a frequency distribution based on quantitative data is very similar to the bar chart showing the distribution of qualitative data. HISTOGRAM A graph in which the classes are marked on the horizontal axis and the class frequencies on the vertical axis. The class frequencies are represented by the heights of the bars
Premium Bar chart Frequency Frequency distribution
BBM203/05 Business Statistics TMA1 Weightage: 25% Submission deadline: 6th March 2015 1 a) Explain TWO (2) main differences between qualitative data and quantitative. (4 marks) b) Using the example of a group of BBM203/05 students in your class‚ differentiate qualitative and quantitative data. (6 marks) 2) A new restaurant did a survey among its customers recently. The following questions were asked in the questionnaire. Identify which type of data are they? Choose from Qualitative-Nominal‚ Qualitative-Ordinal
Premium Random variable Probability theory Arithmetic mean
number of items in several classes is a a. frequency distribution b. relative frequency distribution c. frequency d. cumulative frequency distribution Answer: b 4. Qualitative data can be graphically represented by using a(n) a. histogram b. frequency polygon c. ogive d. bar graph Answer: d 5. The relative frequency of a class is computed by a. dividing the midpoint of the class by the sample size b. dividing the frequency of the class by the midpoint c. dividing
Premium Frequency distribution Frequency