Intro to Statistics- Final Exam Correct
100%
Explain what we mean by a confidence level (exp. 95%) - ANSWER The percentage of
intervals, based on all possible samples of the same size taken from the same
population, that contain the parameter.
For example, if we construct 100 95% confidence intervals using 100 samples of the
same size, approximately 95 of the intervals will contain the true parameter and 5 will
not.
A point estimate is the value of a _________ that estimates the value of a
____________ - ANSWER statistic, parameter
What are the two desirable characteristics of an ideal confidence interval? - ANSWER
narrow and high confidence level
What is the best point estimate for the population proportion? - ANSWER p hat
Type I error - ANSWER reject Ho when Ho is true
Type II error - ANSWER do not reject Ho when Ho is false
statistically significant - ANSWER observed results are unlikely under the assumption
that the null hypothesis is true
random variable - ANSWER assignment of numerical values to all outcomes of a
probability experiment
sampling distribution - ANSWER a probability distribution for all possible values of a
statistic
Two events E and F are independent if - ANSWER occurrence of event E does not
affect the probability of event F in the same experiment
T or F: the empirical probability of an event E may change experiment to experiment -
ANSWER True
Classical Probability - ANSWER Dividing number of outcomes in an event by number of
all possible outcomes
Requirements for Binomial Random Variable - ANSWER 1. 0, 1, 3, ...n
2. counts of successes (must be positive)
3. independent
100%
Explain what we mean by a confidence level (exp. 95%) - ANSWER The percentage of
intervals, based on all possible samples of the same size taken from the same
population, that contain the parameter.
For example, if we construct 100 95% confidence intervals using 100 samples of the
same size, approximately 95 of the intervals will contain the true parameter and 5 will
not.
A point estimate is the value of a _________ that estimates the value of a
____________ - ANSWER statistic, parameter
What are the two desirable characteristics of an ideal confidence interval? - ANSWER
narrow and high confidence level
What is the best point estimate for the population proportion? - ANSWER p hat
Type I error - ANSWER reject Ho when Ho is true
Type II error - ANSWER do not reject Ho when Ho is false
statistically significant - ANSWER observed results are unlikely under the assumption
that the null hypothesis is true
random variable - ANSWER assignment of numerical values to all outcomes of a
probability experiment
sampling distribution - ANSWER a probability distribution for all possible values of a
statistic
Two events E and F are independent if - ANSWER occurrence of event E does not
affect the probability of event F in the same experiment
T or F: the empirical probability of an event E may change experiment to experiment -
ANSWER True
Classical Probability - ANSWER Dividing number of outcomes in an event by number of
all possible outcomes
Requirements for Binomial Random Variable - ANSWER 1. 0, 1, 3, ...n
2. counts of successes (must be positive)
3. independent
