Download presentation

Presentation is loading. Please wait.

Published byDomenic Carr Modified over 2 years ago

1
Chapter 3 Numerically Summarizing Data Insert photo of cover

2
Section 3.3 Measures of Central Tendency and Dispersion from Grouped Data Objectives 1.Approximate the mean of a variable from grouped data 2.Compute the weighted mean 3.Approximate the variance and standard deviation of a variable from grouped data

3
Objective 1 Approximate the Mean of a Variable from Grouped Data

5
Hours01-56-1011-1516-2021-2526-3031-35 Frequency01302502301801006050 The National Survey of Student Engagement is a survey that (among other things) asked first year students at liberal arts colleges how much time they spend preparing for class each week. The results from the 2007 survey are summarized below. Approximate the mean number of hours spent preparing for class each week. Source:http://nsse.iub.edu/NSSE_2007_Annual_Report/docs/withhold/NSSE_2007_Annual_Report.pdf EXAMPLEApproximating the Mean from a Relative Frequency Distribution

6
TimeFrequencyxixi x i f i 0000 1 - 51303.5455 6 - 102508.52125 11 - 1423013.53105 16 - 2018018.53330 21 - 2510023.52350 26 – 306028.51710 31 – 355033.51675

7
Objective 2 Compute the Weighted Mean

9
EXAMPLE Computed a Weighted Mean Bob goes the “Buy the Weigh” Nut store and creates his own bridge mix. He combines 1 pound of raisins, 2 pounds of chocolate covered peanuts, and 1.5 pounds of cashews. The raisins cost $1.25 per pound, the chocolate covered peanuts cost $3.25 per pound, and the cashews cost $5.40 per pound. What is the cost per pound of this mix.

10
Objective 3 Approximate the Variance and Standard Deviation of a Variable from Grouped Data

12
Hours01-56-1011-1516-2021-2526-3031-35 Frequency01302502301801006050 The National Survey of Student Engagement is a survey that (among other things) asked first year students at liberal arts colleges how much time they spend preparing for class each week. The results from the 2007 survey are summarized below. Approximate the variance and standard deviation number of hours spent preparing for class each week. Source:http://nsse.iub.edu/NSSE_2007_Annual_Report/docs/withhold/NSSE_2007_Annual_Report.pdf EXAMPLEApproximating the Mean from a Relative Frequency Distribution

13
TimeFrequency x 0 3.5 0 16453.13 00 1 - 5130 6 - 102508.59765.625 11 - 1423013.5359.375 16 - 2018018.52531.25 21 - 2510023.57656.25 26 - 306028.511343.75 31 - 355033.517578.13

Similar presentations

Presentation is loading. Please wait....

OK

Statistics 300: Elementary Statistics Section 6-5.

Statistics 300: Elementary Statistics Section 6-5.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on uses of concave and convex mirror Ppt on area of plane figures geometry Ppt on games and sports in india Ppt on bluetooth energy meter Ppt on e movie ticket booking system Ppt on addition and subtraction of like fractions Ppt on online shopping cart project Ppt on field study example Ppt on international stock exchange Ppt on polynomials in maths what is pi