HIUS 222 EXAM 1 STUDY GUIDE 2026 TESTED
QUESTIONS AND PRACTICE SOLUTION
GRADED A+
◉ Skewed Right
Answer: -The tail of the chart is on the right side of the peak
◉ Skewed Left
Answer: -The tail of the chart is on the left side of the peak
◉ Bimodial
Answer: -Histogram has two peaks
◉ Uniform
Answer: -Every bar on histogram is pretty much the same height
◉ Summary Numbers
Answer: -A numerical quantity used to describe (or summarize) data
-Ex. Mean, median, mode, range, variance, etc.
◉ Statitic
,Answer: -A summary number for a sample
◉ Probability Density Function
Answer: -Equation of a curve used to compute probabilities of a
continuous random variable, which satisfies two conditions...
1. Area under entire curve must = 1
2. Curve must be greater than or equal to zero at every point
◉ Normal Probability Density Function
Answer: -Describes asymmetric, bell shaped curve
-Completely defined by mean and variance (standard D)
◉ Probabilistic data
Answer: - well-characterized in the long run, but unknown in the
short run
- flipping a coin once vs. flipping it 10,000 times
◉ Sampling
Answer: - techniques used to collect data
- simple random is mostly used
◉ Descriptive data
, Answer: - techniques used to condense and describe sets of data
- histogram, frequency table, and summary numbers
- organizing and summarizing techniques
◉ Inferential statistics
Answer: - techniques used to systematically draw conclusions about
a population from a set of sample data
- states a level of confidence in the conclusion
- hypothesis testing and confidence intervals
- analyzing techniques
◉ Statistical Methods
Answer: combinations of the descriptive and inferential techniques
◉ Population
Answer: - ALL elements in a well-defined group to be studied
- MUST be well-defined; clearly state what elements do and do not
belong to the population
◉ Sample
Answer: - a subset of a population
- the larger the sample size, the better
QUESTIONS AND PRACTICE SOLUTION
GRADED A+
◉ Skewed Right
Answer: -The tail of the chart is on the right side of the peak
◉ Skewed Left
Answer: -The tail of the chart is on the left side of the peak
◉ Bimodial
Answer: -Histogram has two peaks
◉ Uniform
Answer: -Every bar on histogram is pretty much the same height
◉ Summary Numbers
Answer: -A numerical quantity used to describe (or summarize) data
-Ex. Mean, median, mode, range, variance, etc.
◉ Statitic
,Answer: -A summary number for a sample
◉ Probability Density Function
Answer: -Equation of a curve used to compute probabilities of a
continuous random variable, which satisfies two conditions...
1. Area under entire curve must = 1
2. Curve must be greater than or equal to zero at every point
◉ Normal Probability Density Function
Answer: -Describes asymmetric, bell shaped curve
-Completely defined by mean and variance (standard D)
◉ Probabilistic data
Answer: - well-characterized in the long run, but unknown in the
short run
- flipping a coin once vs. flipping it 10,000 times
◉ Sampling
Answer: - techniques used to collect data
- simple random is mostly used
◉ Descriptive data
, Answer: - techniques used to condense and describe sets of data
- histogram, frequency table, and summary numbers
- organizing and summarizing techniques
◉ Inferential statistics
Answer: - techniques used to systematically draw conclusions about
a population from a set of sample data
- states a level of confidence in the conclusion
- hypothesis testing and confidence intervals
- analyzing techniques
◉ Statistical Methods
Answer: combinations of the descriptive and inferential techniques
◉ Population
Answer: - ALL elements in a well-defined group to be studied
- MUST be well-defined; clearly state what elements do and do not
belong to the population
◉ Sample
Answer: - a subset of a population
- the larger the sample size, the better
