SEM 2, 07/08 State whether the following are nominal, ordinal, interval or ratio data.
A statistics test which a student took was easy, difficult or very difficult and these alternatives are coded 1, 2, and 3.
The temperature of different kilns at the factory.
The bottles on a Chemistry laboratory shelf are numbered 1,2,3 and 4 representing sulfuric acid, hydrochloric acid, nitric acid and sodium hydroxide.
The race of the students in a university campus.
(a) The mean of the ages of a group of 8 people is 40 years and the variance is 50 years2.
Two other people whose ages 30 years and 79 years join the group. Calculate the mean
and standard deviation of the ages of the 10 people.
(b) The number of hand phones that are sold in a week by 15 representatives in a town is
5, 10, 8, 7, 25, 12, 5, 14, 11, 10, 21, 9,8 11,18
The number of representatives whose number of hand phones sold is above the median of the data set.
The data values that corresponds to the 63rd percentile.
The distribution of the weights of 133 mineral specimens collected on a field trip is given below:
Number of specimens
Find the median and mode.
Construct a percentile graph (use graph paper). Then, find:
The percentile rank for the weight of the mineral specimen of 45 grams.
SEM 3, 06/07 (a) Name the two areas of statistics.
(b) Identity each of the following as examples of qualitative or quantitative variables:
(i) The breaking strength of a given type of string.
(ii) The hair color of children auditioning for the theatre Ali Baba.
Whether or not a tap is defective.
The length of time required to answer a telephone call at an office.
(a) Farid scores 60 on an English test that has mean of 54 and a standard deviation of 3 and he scores 81 on a History test with a mean of 76 and a standard deviation of 2. On which test did he perform better? Give your reason.
(b) The following data shows the number of books sold by ABC publisher in the Kuala Lumpur Book Fair in a period of 11 days. Find the percentile rank of selling 12 books.
23 15 13 6 12 5
10 22 18 11 25
The income (in thousands of RM) of 28 managers, grouped by class mid-points are as follows:
Number of hours parents spend with their children per day.
(a) The following data shows the number of television sets sold by a firm in a period of 9 weeks. Given that mode=m.
15 21 5 6 7 29 m 10 14
Find the possible value(s) of m if D7=m.
A statistics was conducted for 100 male students and 120 female students taking a pre-university course. The mean and standard deviation of the marks obtained by the male and female students are follows.
Calculate the mean and standard deviation of the marks obtained by all students.