Introduction To Statistics
Question
Suppose men always married women who were 10 percent shorter than they were. The correlation coefficient of the heights of married couples would be
Answer
1.0 since the height of the man is always predictable from the height of the woman
Question
We measure heights and weights of 100 twenty-year old male college students. Which will have the higher correlation
Answer
Both will have the same correlation
Question
Suppose the correlation coefficient between heights (as measured in feet) versus weight (as measured in pounds) is 0.40. What is the correlation coefficient of height measured in inches versus weight measured in ounces? [12 inches = one foot; 16 ounces = one pound]
Answer
0.4
Question
An investigator is studying the relation between the physical and intellectual growth of primary school children (grades 1-6). At each grade level, she notes that the correlation between the height of children and the size of their vocabulary is zero. For all students in the school, the correlation is likely to be
Answer
Positive
Question
A summary measure that describes any given characteristic of the population is known as a ___________
Answer
Parameter
Question
A _________ sample is formed by selecting one unit at random and then selecting additional units at evenly spaced intervals until the sample has been formed
Answer
Systematic
Question
Laspeyre’s index numbers possess ___________
Answer
Upward bias
Question
Most commonly used index number is____________
Answer
None
Question
Investor wishing to invest N100,000 in one of three possible investment alternatives, A, B, and C is an example of
Answer
Decision making under uncertainty
Question
The mean of a distribution is 23, the median is 24, and the mode is 25.5. It is most likely that this distribution is:
Answer
Negatively Skewed
Question
The mean of a distribution is 14 and the standard deviation is 5. What is the value of the coefficient of variation?
Answer
0.357
Question
The mean deviation of the series (a, a + d, a +2d cdots + 2n) from its mean is
Answer
n (n +1) d /2n +1
Question
A student obtained the mean and the standard deviation of 100 observations as 40 and 5.1. It was later found that one observation was wrongly copied as 50, the correct figure being 40. Find the correct mean and the S.D
Answer
Mean = 39.9, S.D =5
Question
For a negatively skewed distribution, the correct inequality is____________
Answer
Mean
Question
What percentage of values is greater the 3rd quartile?
Answer
0.25
Question
Which of the following is a unit less measure of dispersion?
Answer
Coefficient of variation
Question
Individual data is another wise called as ___________
Answer
raw data
Question
The data given as 5, 7, 12, 17, 79, 84, and 91 will be called as____________
Answer
An individual series
Question
Which of the following example does not constitute an infinite population?
Answer
Population of heights of 15 year old children.
Question
In a web-based survey, customers are asked to rate your company’s product on the following scale: Excellent, good, average, poor. The above scale is _____________________
Answer
ordinal
Question
Suppose men always married women who were 10 percent shorter than they were. The correlation coefficient of the heights of married couples would be
Answer
1.0 since the height of the man is always predictable from the height of the woman
Question
We measure heights and weights of 100 twenty-year old male college students. Which will have the higher correlation
Answer
Both will have the same correlation
Question
Suppose the correlation coefficient between heights (as measured in feet) versus weight (as measured in pounds) is 0.40. What is the correlation coefficient of height measured in inches versus weight measured in ounces? [12 inches = one foot; 16 ounces = one pound]
Answer
0.4
Question
An investigator is studying the relation between the physical and intellectual growth of primary school children (grades 1-6). At each grade level, she notes that the correlation between the height of children and the size of their vocabulary is zero. For all students in the school, the correlation is likely to be
Answer
Positive
Question
A summary measure that describes any given characteristic of the population is known as a ___________
Answer
Parameter
Question
A _________ sample is formed by selecting one unit at random and then selecting additional units at evenly spaced intervals until the sample has been formed
Answer
Systematic
Question
Laspeyre’s index numbers possess ___________
Answer
Upward bias
Question
Most commonly used index number is____________
Answer
None
Question
Investor wishing to invest N100,000 in one of three possible investment alternatives, A, B, and C is an example of
Answer
Decision making under uncertainty
Question
The mean of a distribution is 23, the median is 24, and the mode is 25.5. It is most likely that this distribution is:
Answer
Negatively Skewed
Question
The mean of a distribution is 14 and the standard deviation is 5. What is the value of the coefficient of variation?
Answer
0.357
Question
The mean deviation of the series (a, a + d, a +2d cdots + 2n) from its mean is
Answer
n (n +1) d /2n +1
Question
A student obtained the mean and the standard deviation of 100 observations as 40 and 5.1. It was later found that one observation was wrongly copied as 50, the correct figure being 40. Find the correct mean and the S.D
Answer
Mean = 39.9, S.D =5
Question
For a negatively skewed distribution, the correct inequality is____________
Answer
Mean
Question
What percentage of values is greater the 3rd quartile?
Answer
0.25
Question
Which of the following is a unit less measure of dispersion?
Answer
Coefficient of variation
Question
Individual data is another wise called as ___________
Answer
raw data
Question
The data given as 5, 7, 12, 17, 79, 84, and 91 will be called as____________
Answer
An individual series
Question
Which of the following example does not constitute an infinite population?
Answer
Population of heights of 15 year old children.
Question
In a web-based survey, customers are asked to rate your company’s product on the following scale: Excellent, good, average, poor. The above scale is _____________________
Answer
ordinal