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Quiz for stats
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Exam of 9 pages for the course BSMM-8320 at U of W (Quiz for stats)
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MidtermBSMM 8320
Fall 2020
Multiple Choice Questions
1. A student recently wrote an entrance exam and was informed that his score placed him at the 80th
percentile. This indicates that
A) 80 students who also took the exam scored below him.
B) he scored as high or higher than 80 percent of all those who wrote the exam.
C) he was in the bottom 20 percent of those who wrote the exam.
D) his z-score was 80.
E) his exam mark was 80 out of 100.
2. The asking price for homes in the Winnipeg real estate market has a mean value of $286,455 and a
standard deviation of $11,200. The mean and standard deviation in asking price for homes in
Moncton are $188,468 and $8,230, respectively. Recently, one home sold in each city where the
asking price for each home was $225,000. Based on these data, which of the following statements is
true?
A) The variance for Winnipeg real estate market is lower than that for Moncton.
B) The Moncton home has a negative standardized value.
C) The coefficients of variation are very close to each other (both are about 0.04).
D) The Winnipeg home has a positive standardized value.
E) Both homes have the same z-score.
Chapter 6
3. A study examined consumption levels of oil and carbon dioxide emissions for a sample of
municipalities. The response variable in this study is
A) oil brands.
B) oil consumption levels.
C) carbon dioxide emissions.
D) municipalities.
E) oil prices.
4. Government sponsored research investigated the relationship between the number of hours
individuals spend on the Internet and age. Which of the following statements is true?
A) Age is the predictor variable and number of hours spent on the Internet is the response variable.
B) Government is the predictor variable and the number of hours spent on the Internet is the response
variable.
, C) Age is the response variable and the number of hours spent on the Internet is the predictor variable.
D) Age is the predictor variable and government sponsored research is the response variable.
E) Number of individuals is the predictor variable and government sponsored research is the response
variable.
5. If the correlation coefficient for the variables is determined to be 0.70, which of the following is
known to be true?
A) The relationship between the variables is nonlinear.
B) The correlation is negative.
C) The scatterplot for the variables will be upward sloping from left to right.
D) The scatterplot for the variables will be downward sloping from left to right.
E) The scatterplot shows a curvilinear pattern.
Answer: C
6. Which of the following statements is correct?
A) A scatter plot showing two variables with a positive linear relationship will have all points on a
straight line.
B) The stronger the linear positive relationship between two variables, the closer the correlation
coefficient will be to -1.
C) Two variables that are uncorrelated with one another may still be related in a nonlinear manner.
D) A curvilinear relationship will always have a correlation coefficient of exactly zero.
E) The stronger the linear and negative association between two variables, the closer the correlation
coefficient will be to +1.
Answer: E
7. A perfect correlation between two variables will always produce which of the following?
A) a correlation coefficient of -1.0
B) a scatterplot with a pattern running from lower left to upper right
C) a correlation coefficient of 1.0
D) a scatterplot where all points lie on a single straight line
E) a scatterplot with a pattern running from upper left to lower right
Answer: D
8. In a university statistics course a correlation coefficient of -0.8 was found between the number of
classes missed and the course grade. This can be interpreted to mean that
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