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STA 2023 Final Exam Questions and Complete Solutions Graded A+ $14.49   Add to cart

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STA 2023 Final Exam Questions and Complete Solutions Graded A+

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  • Statistics STA
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  • Statistics STA

STA 2023 Final Exam Questions and Complete Solutions Graded A+

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  • November 4, 2024
  • 17
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Statistics STA
  • Statistics STA
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STA 2023 Final Exam
Questions and Complete
Solutions Graded A+
Population - Answer: A collection or set of individuals, objects or events whose properties are to be
analyzed.



Data is rarely collected from the entire population - instead a representative sample is used



Sample - Answer: a subset of the population



Parameter - Answer: a numerical value summarizing all data of the population



statistic - Answer: a numerical value summarizing all data of the sample



Statistic or Parameter? A health club surveys 40 randomly selected members and found the avg weight
is 157 lbs - Answer: statistic



Statistic or parameter? A researcher examines records of all registered voters and finds 43% are
registered democrats - Answer: parameter



variable - Answer: characteristic of the individuals within the population or sample



qualitative - Answer: non-numerical characteristic



may or may not be numbers, but the numbers have no real meaning (e.g., SSN, eye color)

,You cannot do any math with qualitative data (i.e., adding or subtracting SSNs doesn't give you anything
meaningful)



quantitative - Answer: numerical measurements in which the numbers have meaning.



You can compare the numbers and the comparison will make sense



Ex: fat content of different cookies



discrete data - Answer: whole numbers



countable



continuous data - Answer: non-count



What are the 4 levels of measurement? - Answer: 1) Nominal

2) Ordinal

3) Interval

4) Ratio



nominal data - Answer: qualitative data ONLY



Cannot be ordered, cannot be used for calculations



Ex: eye color, SSN



Ordinal data - Answer: can be qualitative or quantitative



Data can be ordered, but there is no meaning placed on the order

, Ex: if you are 5th in line, this doesn't mean you are 5 times better than the 1st person in line.



Interval data - Answer: Quantitative data



You can calculate differences between the data



Zero is NOT the starting point of the data, but it does contain zero, but it is NOT a true zero (e.g., 0
degrees F does not mean there is no heat at all)



Begin to see meaning in data b/c you are able to subract



Ex: IQ - there is a meaningful difference between an IQ of 109 and 110.

Ex 2: temperature



Ratio - Answer: Interval data PLUS you can form ratios, so you can express one point as a multiple of
another, i.e., you can DIVIDE the data



Ratio data starts at zero - there are NO negatives.



Ex: fat contents of cookies. You can divide to show that cookie B has twice the fat of cookie A



Quant or Qual? Nominal, Ordinal, interval or ratio? Temperatures of ocean at various depths - Answer:
quantitative, interval



Quant or Qual? Nominal, Ordinal, interval or ratio? The subjects in which college students major -
Answer: Qualitative, nominal



Quant or Qual? Nominal, Ordinal, interval or ratio? Salaries of college Profs - Answer: Quantitative, ratio

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