HW#1 S - Week 1 homework assignment PDF

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GENG 2220

HW#1

Name:_______________________________

Due: 9/23/2019 11:59 pm

Student #:_________________________________

analyze present 1. Statistic is the science of conducting studies to _______, ______, and draw collect organize, _________, conclusions from data. 2. Determine whether the data are qualitative or quantitative. a. Temperatures inside 10 pizza ovens

quantitative ________________________

b. Speed of Internet access

quantitative ________________________

c. Cholesterol counts for individuals

quantitative ________________________

d. Religious preference for individuals

qualitative ________________________

3. Determine whether the data are discrete or continuous a. Miles driven per car rental

continuous ________________________

b. Lengths of phone calls

discrete ________________________

c. Volume of liquid in a test tube

continuous ________________________

d. The cost of a Statistics textbook

discrete ________________________

e. The blood pressures of a group of students the day before and their final exam

continuous ________________________ f.

The height of a randomly selected student

continuous ________________________

g. The number of ill spills occurring off the Alaskan coast.

discrete ________________________ 4. Classify the variable as nominal-level, ordinal-level, Interval-level, or ratio-level measurement. a. Percentage return on saving accounts

ratio ________________________

b. Credit cards (Visa, Mastercard, Discover…)

nominal ________________________

c. Square footage of a house

ratio ________________________

GENG 2220

HW#1

Name:_______________________________

Due: 9/23/2019 11:59 pm

Student #:_________________________________

5. Identify the independent variable and the depend variable. a. A wellness instructor wants to determine the effect of fitness class types on body fat composition.

fitness class type The independent variable is _____________________________ body fat composition The dependent variable is ______________________________ b. A math department chair wants to determine the correlation between instructional models (online, in class, hybrid) and class grades in a developmental math course.

instructional models The independent variable is _____________________________ class grades The dependent variable is ______________________________ c. An agricultural scientist wants to determine the effect of fertilizer type on the yield of tomatoes. The scientist surveys tomato growers in the area who use the types of fertilizer under consideration.

fertilizer The independent variable is _____________________________ yield of tomatoes The dependent variable is ______________________________ d. A small business owner wants to measure the impact of loyalty card discounts on profit. One month he limits the frequency of discounts and the next month he offers unlimited usage of the discounts.

loyal card discounts The independent variable is _____________________________ profits The dependent variable is ______________________________

GENG 2220

HW#1

Name:_______________________________

Student #:_________________________________

6. Find the class boundaries, midpoints, and widths for the class. 60-64

59.5 - ___ 64.5 a. The class boundaries for the class are _____ __. 62 b. The class midpoint is _____. 5 c. The class width for the class is _____.

7. Find the class boundaries, midpoints, and widths for the class. 133-147 a. The class boundaries for the class are 132.5 _____ - 147.5 _____.

140 b. The class midpoint is _____. 15 c. The class width for the class is _____. 8. The frequency distribution shown is constructed incorrectly. Class Frequency 27-31 3 32-36 2 37-40 0 41-45 6 46-50 9 Select all applicable mistakes in the frequency distribution. 1. Class limits overlap 3. a Class is omitted

Due: 9/23/2019 11:59 pm

GENG 2220

HW#1

Name:_______________________________

Due: 9/23/2019 11:59 pm

Student #:_________________________________

The frequency distribution shown is constructed incorrectly. Class Frequency 3-12 7 12-21 3 21-29 5 29-38 8 39-47 6 Select all applicable mistakes in the frequency distribution. 1. a Class is omitted

9. A survey was taken asking the favorite flavor of a coffee drink a person prefers. The responses were C = Caramel, H = Hazelnut, M = Mocha, P = Plain, and V = Vanilla. V M P M C

C M V M P

P V C M M

P M M P P

M M V M M

M M M M H

P V C C H

P M P V P

M M M M H

C M P C P

a. Construct a categorical frequency distribution for the data. Class

Frequency

Caramel

7

Hazelnut

3

Mocha

22

Plain

12

Vanilla

6

b. Which class has the most data values and which class has the fewest data values? mocha hazelnut class has the fewest data values. The _____ ____class has the most data values, and the __________

GENG 2220

HW#1

Name:_______________________________

Due: 9/23/2019 11:59 pm

Student #:_________________________________

10. The number of stories in each or world’s 28 tallest buildings is listed below. 54 55 60

79 72 90

100 60 64

70 80 77

75 55 88

56 88 65

88 80 102

55 85 70

78 69

Source: New York Times Almanac. a. What is the class width for a frequency distribution with 5 classes? (102-54)/5 = 9.6

Therefore the class with is 10.

b. Find the class limits. The first lower class limit is 54. And Find the class boundaries. Class limits

Class boundaries

63 54 - ____

53.5- ____ 63.5 ____

64 - ____ 73 ____

63.5- ____ 73.5 ____

74 - ____ 83 ____

73.5- ____ 83.5 ____

84 - ____ 93 ____

83.5- ____ 93.5 ____

94 - ____ 103 ____

93.5- ____ 103.5 ____

c. Find the frequency. Class limits

Class boundaries

Frequency

63 54 - ____

53.5- ____ 63.5 ____

7 ______

64 - ____ 73 ____

63.5- ____ 73.5 ____

7 ______

74 - ____ 83 ____

73.5- ____ 83.5 ____

7 ______

84 - ____ 93 ____

83.5- ____ 93.5 ____

5 ______

94 - ____ 103 ____

93.5 - ____ 103.5 ____

2 ______

75 71

GENG 2220

HW#1

Due: 9/23/2019 11:59 pm

Name:_______________________________ Student #:_________________________________ d. Construct a cumulative frequency distribution using 5 classes. Class limits

Cumulative Frequency

54 - ____ 63 ____

7 ______

64 - ____ 73 ____

14 ______

74 - ____ 83 ____

21 ______

84 - ____ 93 ____

26 ______

94 - ____ 103 ____

28 ______...