MGSC 291 EXAM 3 QUESTIONS & ANSWERS
The correlation of data with a lagged version of itself is called - Answers -
autocorrelation
Suppose you have a time series model and the lag1 coefficient B= 1.2. What type of
series do you have? - Answers -diverging
Which of the following is the most useful type of series for modeling? - Answers -mean
reverting
In a time series, regular variation that is repeated within a year is called - Answers -
seasonal variation
Use logistic regression when - Answers -the response is binary
Use log-log model when - Answers -the predictor and response move multiplicatively
with each other
What is a sampling distribution? - Answers -the distribution of a statistiv
If your sample size is n=250, what is the approximate shape of the distribution for the
sample mean? - Answers -normal
Dependencies in the data often lead to an - Answers -underestimate of uncertainty
How do you estimate the standard error of the sampling distribution using a bootstrap? -
Answers -calculate the standard deviation of the bootstrap estimates
Which of the following is a pre-specified cut off to determine statistical significance for a
hypothesis test? - Answers -significance level
In hypothesis testing, low p-value means - Answers -a rare result if the null were true
Increasing the sample size will - Answers -increase the chance of finding statistical
significance
If a researcher collects more data or tries different analyses just to achieve statistical
significance, this is known as - Answers -p-hacking
Suppose the p-value reported for a beta coefficient summary.glm is <2.2e-16. What
does this mean? - Answers -the predictor's coefficient is statistically different from 0
The correlation of data with a lagged version of itself is called - Answers -
autocorrelation
Suppose you have a time series model and the lag1 coefficient B= 1.2. What type of
series do you have? - Answers -diverging
Which of the following is the most useful type of series for modeling? - Answers -mean
reverting
In a time series, regular variation that is repeated within a year is called - Answers -
seasonal variation
Use logistic regression when - Answers -the response is binary
Use log-log model when - Answers -the predictor and response move multiplicatively
with each other
What is a sampling distribution? - Answers -the distribution of a statistiv
If your sample size is n=250, what is the approximate shape of the distribution for the
sample mean? - Answers -normal
Dependencies in the data often lead to an - Answers -underestimate of uncertainty
How do you estimate the standard error of the sampling distribution using a bootstrap? -
Answers -calculate the standard deviation of the bootstrap estimates
Which of the following is a pre-specified cut off to determine statistical significance for a
hypothesis test? - Answers -significance level
In hypothesis testing, low p-value means - Answers -a rare result if the null were true
Increasing the sample size will - Answers -increase the chance of finding statistical
significance
If a researcher collects more data or tries different analyses just to achieve statistical
significance, this is known as - Answers -p-hacking
Suppose the p-value reported for a beta coefficient summary.glm is <2.2e-16. What
does this mean? - Answers -the predictor's coefficient is statistically different from 0
