1. A researcher collected BMI (Body Mass Index) of 50 students in an Engineering school. He found the mean BMI was much smaller than the median BMI. The reason for this might be___ a. Several students had much smaller BMI scores than the other students b. Several students had much larger BMI scores than the rest c. The researcher made some measurement errors d. All the students had smaller BMI scores, compared to national average 2. What is the level of measure for each of the following: a) Final grades in this class _____________________ b) Weights of newborn babies _____________________ c) Seasons of the year _____________________ d) Boiling temperatures of different liquids _____________________ 3. Determine type of sampling used: a) I collected shoe sizes from my family _____________________ b) 1003 adults were called after their phone numbers were randomly generated by computer ____________________ c) Police stopped every sixth driver for sobriety test ____________________ d) U.S.D.O.C. collected data by randomly selecting 8 Federal prisons and surveying every prisoner _____________________ 4. I collected radon samples from basements in my neighborhood and obtained the following: Radon in cPi Frequency 2-5 2 6-9 2 10-13 6 14-17 15 Identify class width ______________________ Identify class midpoints ______________________ Identify class boundaries ______________________ Create a histogram for these data. 5. Create a scatterplot of car weights and braking distance using the data below. Based on the result, does there appear to be a relationship between weight of a car and its braking distance? Weight (lb) 4035 3115 4115 3650 3565 4030 Braking Distance (ft) 131 136 129 127 146 146 6. The weekly salaries for teachers of the different grades at my school are as follows: Kindergarten First Second Third Fourth Fifth 774 649 1210 546 431 612 Calculate the standard deviation. Do the different grades have much variation in salary? 7. A simple random sample of pages of my dictionary was collected. These are the number of words defined on each page. Find the mean, median, mode, and midrange. 51 63 36 43 34 62 73 39 53 79 There are 1459 pages. Estimate the total number of words in the dictionary. Is the estimate likely to be an accurate estimate of the total number of words in the English language? 8. I had 10 students last term who earned the following grades: 98 85 89 73 76 85 87 92 85 56 Find the first quartile:________________ Find the median: ________________ Find the third quartile:________________ Find the interquartile:_________________ .

1. 1.
A researcher collected BMI (Body Mass Index) of 50 students in
an Engineering school. He found the mean BMI was much
smaller than the median BMI. The reason for this might be___
a.
Several students had much smaller BMI scores than the other
students
b.
Several students had much larger BMI scores than the rest
c.
The researcher made some measurement errors
d.
All the students had smaller BMI scores, compared to national
average
2.
What is the level of measure for each of the following:
a)
Final grades in this class
_____________________
b)
Weights of newborn babies
_____________________

2. c)
Seasons of the year
_____________________
d)
Boiling temperatures of different liquids
_____________________
3.
Determine type of sampling used:
a)
I collected shoe sizes from my family
_____________________
b)
1003 adults were called after their phone
numbers were randomly generated by computer
____________________
c)
Police stopped every sixth driver for sobriety test
____________________

3. d)
U.S.D.O.C. collected data by randomly selecting
8
Federal prisons and surveying every prisoner
_____________________
4.
I collected radon samples from basements in my neighborhood
and obtained the following:
Radon in cPi
Frequency
2-5
2
6-9
2
10-13
6
14-17
15
Identify class width
______________________
Identify class midpoints
______________________
Identify class boundaries

4. ______________________
Create a histogram for these data.
5.
Create a scatterplot of car weights and braking distance using
the data below. Based on the result, does there appear to be a
relationship between weight of a car and its braking distance?
Weight (lb)
4035
3115
4115
3650
3565
4030
Braking Distance (ft)
131
136
129
127
146
146

5. 6.
The weekly salaries for teachers of the different grades at my
school are as follows:
Kindergarten
First
Second
Third
Fourth
Fifth
774
649
1210
546
431
612
Calculate the standard deviation. Do the different grades have
much variation in salary?

6. 7.
A simple random sample of pages of my dictionary was
collected.
These are the number of words defined on each page. Find the
mean, median, mode, and midrange.
51
63
36
43
34
62
73
39
53
79
There are 1459 pages. Estimate the total number of words in the
dictionary. Is the estimate likely to be an accurate estimate of
the total number of words in the English language?

7. 8.
I had 10 students last term who earned the following grades:
98
85
89
73
76
85
87
92
85
56
Find the first quartile:________________
Find the median:
________________

8. Find the third quartile:________________
Find the interquartile:_________________