PSU Stat 200 Exam 1 Questions With All
Correct & Verified Answers
Z score Correct answer-find the difference between a value in the sample and the mean, and
divide it by the standard deviation
z=X-μ/σ
X is specific point you're looking at, u is the mean, o is standard deviation
Right skewed Correct answer-Mean greater than median, tail pointing to the right, positively
skewed
Left skewed Correct answer-Mean less than median, tail pointing to the left, negatively skewed
Sensitive statistic Correct answer-Uses all observations, affected by skewedness
Robust/static statistic Correct answer-Uses only a few observations, remains mainly the same
Population Correct answer-N - all observations ideally desired (entire country)
Sample Correct answer-n - observations that are actually obtained (surveyed number of people)
Descriptive methods Correct answer-Describe a sample
Inferential methods Correct answer-Make inferences about populations
Census survey Correct answer-Data collected from each member of a population
Sample survey Correct answer-Sample of a census
Quantitative Correct answer-Number
5 number summary Correct answer-Min, Q1, median, Q3, max
Q1, Q2, Q3 Correct answer-All resistant
Boxplot Correct answer-Best to find 5 number summary, find outliers
Discrete variables Correct answer-Distinct number, not changing (number of siblings a person has,
ticket price, shoe size)
Continuous variable Correct answer-Something that must be measured (typically with a
benchmark or tool) and continues to grow - resting heart rate, age)
Observational study Correct answer-Participants are observed and measured
Randomized experiment Correct answer-
Confounding variable Correct answer-Not the main concern of the study but partially responsible
for observed results
Correct & Verified Answers
Z score Correct answer-find the difference between a value in the sample and the mean, and
divide it by the standard deviation
z=X-μ/σ
X is specific point you're looking at, u is the mean, o is standard deviation
Right skewed Correct answer-Mean greater than median, tail pointing to the right, positively
skewed
Left skewed Correct answer-Mean less than median, tail pointing to the left, negatively skewed
Sensitive statistic Correct answer-Uses all observations, affected by skewedness
Robust/static statistic Correct answer-Uses only a few observations, remains mainly the same
Population Correct answer-N - all observations ideally desired (entire country)
Sample Correct answer-n - observations that are actually obtained (surveyed number of people)
Descriptive methods Correct answer-Describe a sample
Inferential methods Correct answer-Make inferences about populations
Census survey Correct answer-Data collected from each member of a population
Sample survey Correct answer-Sample of a census
Quantitative Correct answer-Number
5 number summary Correct answer-Min, Q1, median, Q3, max
Q1, Q2, Q3 Correct answer-All resistant
Boxplot Correct answer-Best to find 5 number summary, find outliers
Discrete variables Correct answer-Distinct number, not changing (number of siblings a person has,
ticket price, shoe size)
Continuous variable Correct answer-Something that must be measured (typically with a
benchmark or tool) and continues to grow - resting heart rate, age)
Observational study Correct answer-Participants are observed and measured
Randomized experiment Correct answer-
Confounding variable Correct answer-Not the main concern of the study but partially responsible
for observed results
