statistics Collecting Data

Transcription

1 Date: statistics Collecting Data Objective: Categorize data as qualitative or quantitative. (AS1) Determine whether the data to be analyzed is univariate or bivariate. (AS2) Determine when collected data or display may be biased. (AS3) Identify and describe sources of bias and its effect, drawing conclusions from data. (AS15) Dec 21 2:41 PM Qualitative vs. Quantitative Data Overview: Qualitative Data Deals with descriptions. Data can be observed but not measured Colors, textures, smells, tastes, appearance, beauty, etc. Qualitative Quality Dec 21 2:36 PM 1

2 Overview: Quantitative Data Deals with numbers. Data which can be measured. Length, height, area, volume, weight, speed, time, temperature, humidity, sound levels, cost, members, ages, etc. Quantitative Quantity QuaNtitative Numbers Mar 28 10:32 PM Mar 28 10:52 PM 2

3 Mar 28 10:53 PM Mar 28 10:55 PM 3

4 Dec 21 2:37 PM Identify the following statements as univariate or bivariate data. The pulse rate of 8 randomly selected individuals after jogging for one minute. A person's birth weight and the persons height as an adult Relationship between the cost of a car and the number of cars sold Mar 29 6:42 AM 4

5 Dec 21 2:38 PM Dec 21 2:38 PM 5

6 Dec 21 2:38 PM Dec 21 2:38 PM 6

7 For questions 1 4, determine if the data listed is quantitative data or qualitative data. 1. Jed s new horse is 15.2 hands high, weighs 1250 pounds, costs $2,200, and is 3 years old. Quantitative Qualitative Feb 9 5:56 PM 2. The tree has rough brown bark, red berries, wandering branching, and small, sharply edged leaves. Quantitative Qualitative 3. Pennsylvania coal is fluorescent black, leaves a black residue, and has an earthy smell and a rough texture. Quantitative Qualitative Feb 9 5:56 PM 7

8 4. Of the 578 students in the senior class at LHS High School, 236 are honor students, 150 are scholarship winners, and 51% are male. Quantitative Qualitative Feb 9 5:56 PM For questions 5 8, determine if the problem deals with univariate or bivariate data. 5. Determine if the number of hours a student studies will improve his/her final examination scores. Univariate Data Bivariate Data 8

9 6. Determine the mean score on the last math test. Univariate Data Bivariate Data 7. Determine whether lowering cholesterol lowers the risk of heart disease. Univariate Data Bivariate Data 8. Prepare a frequency table for the number of students scoring A, B, C, or D on the Chemistry test. Univariate Data Bivariate Data 9

10 For questions 9 12, determine if the situation is biased. 9. A study is conducted to determine whether office workers have high blood pressure. The participants in the study were friends of the researcher who shared the same doctor. Biased Unbiased 10. A study is conducted to determine the number of students who wore a free promotional T shirt given to all students at a local university rock concert. Five hundred students were chosen at random from the 5000 students attending the concert and asked if they wore the T shirt during the concert. Biased Unbiased 10

11 11. A study is conducted to estimate the average speed of drivers using the fast lane of the motorway. To determine the drivers' speeds, a police car will follow the drivers on the motorway and record their speeds using the police car's speedometer. Biased Unbiased 12. A movie theater is conducting a survey on their customer service. Customers willing to complete the survey are entered in a drawing for a free ipod. Biased Unbiased 11

12 Homework p #1 27 odd Mar 6 1:38 PM 12