Download presentation

Presentation is loading. Please wait.

Published byCristopher Worley Modified over 2 years ago

1
Quiz 3 Results (Review for Midterm 1)

2
Results

3
Problem 1 Everyone scored 100% (4/4) (1)Are the following variables categorical (c) or quantitative (q)? a.__q__ Age (in years) b.__c__ Age (possible choices are “old”, “young”, “average”) c.__q__ Number of credit hours d.__c__ Gender

4
Problem 2 Each part was worth 1 for a total of 4 (2) Consider the following cross-tab table. It is a sample taken from a room full of professionals at Aultman Hospital last year: Profession Statistician Doctor Lawyer Tall 20 30 10 Short 25 15 5 __105__ How big was the sample size? __44.4__ Percent of statisticians that are tall? __57.1__ Percent of people that are doctors or lawyers? __Lawyers__ Who is more likely to be tall – Statisticians or lawyers? Percent of Lawyers that are tall = 10/15 Percent of Statisticians that are tall = 20/45

5
Problem 3 Each part was worth 1 for a total of 3 (3) Indicate whether the following are measures of variation/spread/center. __c__ Median __s__ Range __v__ Standard Deviation

6
Problem 4 Was worth 1 point (4) Which of the following is the least effective way to graph a categorical variable? (Choose one) ____ Pie Chart _x___ Histogram ____ Bar Chart

7
Problem 5 Each part was worth 1 point for a total of 5 (5) Consider the following Histogram (actual histogram of class grades so far in the semester). THERE WERE 31 OBSERVATIONS: __5/31__ Percent of students with a failing grade (65% is the D/F cutoff point) __5+6__ Number of students with an A (90% is the A/B cutoff point) __(1+1+3+5+6)/31__ Percent of students with an A or an F __Left__ Is this histogram skewed to the right (R), left (L), or symmetric (S)? __No__ Based on your answer in part D, is the mean larger than the median? Left: mean < median Right: mean > median Sym: mean = median

8
Problem 6 Each part of 5 number summary is worth 1, standard deviation calculation is worth 3; Total of 8 possible points. (6) Give me the five number summary and calculate the standard deviation of: 35, 25, 30, 15, 10, 25, 35 10, 15, 25, 25, 30, 35, 35 10, 15, 25, 25 25, 30, 35, 35 Min: 10 Q1: (15+25)/2=20 Q3: (30+35)/2=32.5 Q2: 25 Max: 35 yy-mean(y-mean) 2 1010-25(-15) 2 1515-25(-10) 2 2525-250202 2525-250202 3030-255252 3535-2510 2 3535-2510 2 s 2 =(225+100+0+0+25+100+100)/(7-1)=91.7 S=sqrt(91.7)=9.6

9
Problem 7 Each part was worth 1 point (total of 5) (7) __2__ How many outliers are in the following box plot? _1,12___ What is the largest and the smallest value in the data? __6__ What is the median in the data? _yes___ Is Q1 the smallest non-outlier data point? _9___ What is the second largest value in the data set?

10
Problem 8 Each part was worth 1 point (total of 2) (8) Consider the left scatter plot (Left) and the right scatter plot (Right). ___positive_ What is the direction of the first scatter plot? ___.56_ One graph has a correlation of r=.85 and the other has r=.56. What is the correlation of the second graph?

11
Problem 9 Each part was worth 1 point (total of 3) (9) ____Stem & Leaf___________ What is the name of the graph below? _______22________ What is the mode of the graph below? _______Right________ If possible, determine the skewness of the following data

Similar presentations

Presentation is loading. Please wait....

OK

CHAPTER 1 Exploring Data

CHAPTER 1 Exploring Data

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on principles of object-oriented programming pdf Ppt on centring diphthong Ppt on indian army weapons purchase Ppt online viewer free Ppt on value stream mapping in lean manufacturing Ppt on new zealand culture images Ppt on tamper resistant outlets Ppt on leadership quotes Ppt on wheel balancing Ppt on power generation by coal