KEY
STAT 101
NAME: __________________
CLASS ASSIGNMENT #1 [12 points]:
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CA#1
COMPLETE ASSIGNED PROBLEMS ON THIS SHEET.
Available 1.26.17 :: Due 1.31.17
THIS ASSIGNMENT IS DUE AT CLASS TIME TUESDAY.
Problem point values and point credit distributions are included in brackets [ ].
Please be thorough and neat in the presentation of your responses as they must fit within the space provided.
General Grading: -.5 for first error; -1 to -2 for multiple errors; 0 minimal effort/not attempted/incorrect.
If your surname (last name) begins with the letter:
“A” through “L,” complete part “A)” of problems 2 through 4.
“M” through “Z,” complete part “B)” of problems 2 through 4.
Problem 1 [3]: (everyone answers this item; show calculations leading to estimated population)
Aging Population [3; see general grading; answer must be within +/- .5% of actual estimate]: It is predicted that
there will be 88,547,000 elderly individuals (65 and over) in the U.S. in 2050 and that they will represent 20.2% of the
entire population. What will be the estimated U.S. population?
88,547,000 20.2
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 20.2 x  8,854,700,000  x  438,351,485.15 people
x
100
Problem 2 [3]: (place answers to your assigned item A) or B) below)
A) Net Weight [3; .5/item]: A Quality Control researcher at the Blue Boy Food Processing plant in Mt. Morris, NY
suspects that the net weight of cans of corn is under the stated value of 12 ounces. The researcher acquires a
random sample of 50 cans of corn and records their net weights.
What/who are the observational units? Cans of corn
Identify the variable of interest (OBJECTIVE variable): net weight of cans of corn
Circle the variable’s characteristics:
[ Qual. or Quant. ]
[ Discrete Continuous Not Apply ]
[ Nominal Ordinal Interval Ratio ]
Identify an EXPLANATORY variable that could help us understand the objective variable: tough one here:
speed of processing line; can composition; and …
B) Voltage Levels [3; .5/item]: Researchers at the Consumer Product Testing Laboratory tested a sample of 43
electric surge protectors to find the voltage levels at which computers can be damaged.
What/who are the observational units? Surge protectors
Identify the variable of interest (OBJECTIVE variable): voltage level
Circle the variable’s characteristics:
[ Qual. or Quant. ]
[ Discrete Continuous Not Apply ]
[ Nominal Ordinal Interval Ratio ]
Identify an EXPLANATORY variable that could help us understand the objective variable: Tough one: line
length, temperature, and …
1
KEY
Problem 3 [3]: Interpreting Data
The following two tables are from a worldwide study, which collected a number of variables across 109 countries.
Table 3A is part 3A), Table 3B is part 3B) for responses.
Place Answers for problem 3A or 3B below:
3A) What/who are the observational units [1]? Countries
Identify the variable of interest (OBJECTIVE variable) [.5]: predominant religion
Circle characteristics [1.5]:
Qual. or Quant.
Discrete Continuous or N/A
Nominal Ordinal Interval Ratio
3B) What/who are the observational units [1]? Countries
Identify the variable of interest (OBJECTIVE variable) [.5]: predominant climate
Circle characteristics [1.5]:
Qual. or Quant.
Discrete Continuous or N/A
Nominal Ordinal Interval Ratio
P roblem 4 [3]: Calculations
Calculate the value for the assigned problem.
4 A) :
8(56.80)  (14.60)( 26)
8(32.9632)  (14.60)
2
8(104)  26
2
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454.4  379.6
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263.7056  213.16 832  676
74.8
74.8
74.8
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 .84237  .842
50.5456 156 7.1095 * 12.4899 88.7969
4B) :
8(56.80)  (29.20)(52)
[8(30.50)  12 ][8(90)  26 ]
2
2
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454.4  1518.4
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[244  144][720  676]
 1064
 1064
 1064
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 16.040
[[100][ 44]
4400 66.3325
2