Say true or false.
1. Mode the most frequent observation in a given data set.
2. Histogram is a graph used to present qualitative data.
Choose the correct answer.
1. Which one of the following is an example of inferential statistics?
A). The average age of students at our college is 25 years.
B). Two thirds of all doctors interviewed smoke cigarette's
C). At the result of recent cutbacks by oil producing nations we can expect the price of gasoline to double in the next year.
D). All.
2. In descriptive statistics our main objective is
A). Describe the sample using population data.
B). describe the data we collected
C). Infer something about the population
D). All.
3. A plot of upper class boundaries versas lessthan cumulative frequencies is:
A). Histogram
B). Frequency polygon
C). Less than ogive
D). None
4. The arithmetic mean of 20 observation was 20. But while calculating this an observation 13 was misread as 30. The convert mean is:
A). 18.5
B). 19.15
C). 20.85
D). None
WRITING.
1. Define statistics in its singular and plural senses.
2. Write at least three limitations of statistics.
WRITE SHORT ANSWERS.
1. For each of the following first determine the type of variable(qualitative or quantitative) and secind identify the measurement scale(nominal, ordinal, interval or ratio).
a). Temprature reading in Fahrenheit.
b). Height of students in a class
c). Educational status(BSc, MSc and PHD)
d). Blood type of individuals(A, B, AB and O)
WORK OUT. show all the necessary steps
1. The following data represents the nuber of books read in the past six months by each student in the class of 25. 6, 24, 14, 11, 33, 15, 15, 8, 14, 10, 8, 27, 15, 6, 20, 20, 9, 33, 15, 10, 6, 11, 20, 8, 6.
Contrust an appropriate grouped frequency distribution that contains class limits, frequencies, class boundaries, class marks and cumulative frequency less than type.
2. Marks of 75 students are summerized in the following frequency distribution.
Marks of students are: 40-44, 45-49 50-54 55-59, 60-64 65-69, 70-74. and number of students are in ordered to 7, 10, 22, F4, F5, 6 and 3.
If 20% of the students have marks between 55 and 59 then find:
A). The missing frequencies F4 and F5
B). Find the median
C). Find the mode
May 31, 2024