practice quiz
Practice Quiz I
1.
The following bar chart describes the results of a survey concerning the relevance of study to present job by school.
Focus on the School of Business and Management. What are the mode and the median respectively? (a) Relevant, Neutral
(b) Relevant, Relevant
(c) Neutral, Relevant
(d) Neutral, Neutral
2.
Some graphical descriptions of final examination scores for students of a Statistics course are given below. Please indicate which one is false.
(a)
(b)
(c)
(d)
The score distribution is left skewed
The interval length for the histogram is 10
There is at least one student got the perfect score of 100
Among all intervals in the histogram, the highest frequency occurs at 70’s.
3.
Based on the figure above, which statement is correct?
(a) There is only one outlying score.
(b) Removing outlier(s) would increase the mean and SD.
(c) The mean score is higher than the median score.
(d) More than 50% of the students scored between 50 and 80.
4.
In order to analyze the strength of a certain product, a sample of size 1000 were selected and tested. The histogram of the strengths is nearly bell-shaped, with the following summary.
Summary
Strength (pounds)
Mean
1180
Median
1175
IQR
108
SD
80
The empirical rule predicts that approximately 68% of the strengths will be in the interval
(a) [1100, 1260]
(b) [1020, 1340]
(c) [1067, 1284]
(d) [1095, 1255]
5.
The weekly salary paid to employees of a small company that supplies part-time laborers averages $800 with a standard deviation of $500. Suppose the weekly salaries are normally distributed. If every employee receives a year-end bonus that adds $100 to the paycheck in the final week, how does this change the normal model for that week?
(a) It shits the mean from $800 to $900 and the SD from $500 to $600.
(b) It shits the mean from $800 to $900.
(c) It does not cause any change to the normal model.
(d) It shits
1.
The following bar chart describes the results of a survey concerning the relevance of study to present job by school.
Focus on the School of Business and Management. What are the mode and the median respectively? (a) Relevant, Neutral
(b) Relevant, Relevant
(c) Neutral, Relevant
(d) Neutral, Neutral
2.
Some graphical descriptions of final examination scores for students of a Statistics course are given below. Please indicate which one is false.
(a)
(b)
(c)
(d)
The score distribution is left skewed
The interval length for the histogram is 10
There is at least one student got the perfect score of 100
Among all intervals in the histogram, the highest frequency occurs at 70’s.
3.
Based on the figure above, which statement is correct?
(a) There is only one outlying score.
(b) Removing outlier(s) would increase the mean and SD.
(c) The mean score is higher than the median score.
(d) More than 50% of the students scored between 50 and 80.
4.
In order to analyze the strength of a certain product, a sample of size 1000 were selected and tested. The histogram of the strengths is nearly bell-shaped, with the following summary.
Summary
Strength (pounds)
Mean
1180
Median
1175
IQR
108
SD
80
The empirical rule predicts that approximately 68% of the strengths will be in the interval
(a) [1100, 1260]
(b) [1020, 1340]
(c) [1067, 1284]
(d) [1095, 1255]
5.
The weekly salary paid to employees of a small company that supplies part-time laborers averages $800 with a standard deviation of $500. Suppose the weekly salaries are normally distributed. If every employee receives a year-end bonus that adds $100 to the paycheck in the final week, how does this change the normal model for that week?
(a) It shits the mean from $800 to $900 and the SD from $500 to $600.
(b) It shits the mean from $800 to $900.
(c) It does not cause any change to the normal model.
(d) It shits