STAT 200 Exam 4 questions with correct
answers
Parameter - CORRECT ANSWER-✔✔✅A number that is used to summarize an entire population. This
number is fixed and unchanging.
Example: the average GPA of all PSU students.
Statistic (Sample Statistic) - CORRECT ANSWER-✔✔✅A number that is used to summarize a sample.
The value of this number can be different for different samples taken from the same population.
Example: The average GPA of 100 PSU students.
Statistical Inference - CORRECT ANSWER-✔✔✅This is when you use information from a sample to
make generalizations about the larger population. Using the statistic to estimate the parameter.
In order to use a sample to make conclusions about a population, the sample must be
_______________________. - CORRECT ANSWER-✔✔✅In order to use a sample to make conclusions
about a population, the sample must be randomly selected from the population.
It is only representative if randomly selected.
What are the methods of statistical inference? - CORRECT ANSWER-✔✔✅Confidence interval and
hypothesis test
Confidence interval - CORRECT ANSWER-✔✔✅A range of values that is used to estimate the true,
unknown value or the population parameter.
Hypothesis test (significance test) - CORRECT ANSWER-✔✔✅A statistical test used to determine
whether the sample data is strong enough to make a conclusion about the population.
, One categorical variable - CORRECT ANSWER-✔✔✅Proportion
Two categorical variables - CORRECT ANSWER-✔✔✅Difference in proportions
One quantitative variable - CORRECT ANSWER-✔✔✅Mean
One categorical variable and one quantitative variable - CORRECT ANSWER-✔✔✅Difference in
means
Correlation - CORRECT ANSWER-✔✔✅Strength and direction between two quantitative variables
Sampling distribution - CORRECT ANSWER-✔✔✅The probability distribution of possible values of a
statistic for repeated samples of the sample size taken from the same population.
Mean sample of a sampling distribution - CORRECT ANSWER-✔✔✅Is equal to the population
parameter.
The center = the actual mean
Standard deviation of a sampling distribution - CORRECT ANSWER-✔✔✅Measures the variation
among possible values of the samples statistic over all possible random samples within a population.
Standard error - CORRECT ANSWER-✔✔✅The variation from sample to sample; the estimated value
of the standard deviation of a sampling distribution.
Hypothesis testing - CORRECT ANSWER-✔✔✅Tests a statement about a population; using sample
data to attempt to reject a statement about a population.
Significance test - CORRECT ANSWER-✔✔✅Another name for hypothesis testing.
answers
Parameter - CORRECT ANSWER-✔✔✅A number that is used to summarize an entire population. This
number is fixed and unchanging.
Example: the average GPA of all PSU students.
Statistic (Sample Statistic) - CORRECT ANSWER-✔✔✅A number that is used to summarize a sample.
The value of this number can be different for different samples taken from the same population.
Example: The average GPA of 100 PSU students.
Statistical Inference - CORRECT ANSWER-✔✔✅This is when you use information from a sample to
make generalizations about the larger population. Using the statistic to estimate the parameter.
In order to use a sample to make conclusions about a population, the sample must be
_______________________. - CORRECT ANSWER-✔✔✅In order to use a sample to make conclusions
about a population, the sample must be randomly selected from the population.
It is only representative if randomly selected.
What are the methods of statistical inference? - CORRECT ANSWER-✔✔✅Confidence interval and
hypothesis test
Confidence interval - CORRECT ANSWER-✔✔✅A range of values that is used to estimate the true,
unknown value or the population parameter.
Hypothesis test (significance test) - CORRECT ANSWER-✔✔✅A statistical test used to determine
whether the sample data is strong enough to make a conclusion about the population.
, One categorical variable - CORRECT ANSWER-✔✔✅Proportion
Two categorical variables - CORRECT ANSWER-✔✔✅Difference in proportions
One quantitative variable - CORRECT ANSWER-✔✔✅Mean
One categorical variable and one quantitative variable - CORRECT ANSWER-✔✔✅Difference in
means
Correlation - CORRECT ANSWER-✔✔✅Strength and direction between two quantitative variables
Sampling distribution - CORRECT ANSWER-✔✔✅The probability distribution of possible values of a
statistic for repeated samples of the sample size taken from the same population.
Mean sample of a sampling distribution - CORRECT ANSWER-✔✔✅Is equal to the population
parameter.
The center = the actual mean
Standard deviation of a sampling distribution - CORRECT ANSWER-✔✔✅Measures the variation
among possible values of the samples statistic over all possible random samples within a population.
Standard error - CORRECT ANSWER-✔✔✅The variation from sample to sample; the estimated value
of the standard deviation of a sampling distribution.
Hypothesis testing - CORRECT ANSWER-✔✔✅Tests a statement about a population; using sample
data to attempt to reject a statement about a population.
Significance test - CORRECT ANSWER-✔✔✅Another name for hypothesis testing.
