STA100 Final Term Past Papers

STA301 Statistics and Probability · Final Term Examination - August 2004 · Time Allowed: 150 Minutes · Instructions

3. You are allowed to use the calculator & Statistical tables in order to solve the questions.
4. For your convenience we are providing you the following symbols,

� ,?, X or write Mean, s, or sd for standard deviation, s2 2 or sd2 or variance for

variance, for square root or whole square root.

Q1. Write down any three types of average.

Q2. Define the Trial and the Outcome.

Q3. What is meant by Sampling Distribution?

Q4. Define the following:

1. Null Hypothesis
2. Alternative Hypothesis

Q5. Which of the following is the example of discrete variable?

Total Questions: 15 · Marks : 3 · Marks : 3 · Marks : 3 · Marks : 3 · Marks : 1

o o o o The number of children in different families of a locality Ages of cancer patients Height of students None of these

Q6. The Mode of the letters in the word STATISTICS is:

Marks : 1

o o o o S T I S and T

Q7. In Binomial Experiment, successive trails are:

Marks : 1

o o o o Both independent and dependent. Dependent Independent None of above

Q1. For a positively skewed distribution m3 will be: (1 marks)

1. Positive
2. Negative
3. Zero
4. 1

Q2. When data is labeled to identify an attribute of element, the measurement scale is: (1 marks)

1. Ordinal
2. Interval
3. Nominal
4. Ratio

Q3. Suppose the estimated equation is ˆ (1 marks)

Y X has been calculated for a set of data. What is slop of the line:

1. 0
2. 2
3. -2
4. 5

Q4. If P(B|A) = 0.25 and (1 marks)

0.20 P A B , then P(A) is:

1. 0.05
2. 0.80
3. 0.95
4. 0.75

Q5. Which branch of statistics deals with the techniques that are used to organize, summarize, and present the data: (1 marks)

1. Advance statistics
2. Probability statistics
3. Descriptive statistics
4. Inferential statistics

Q6. In a sample of 800 students in a university, 160, or 20%, are Business majors. Based on the above information, the school's paper reported that "20% of all the students at the university are Business majors." This report is an example of : (1 marks)

1. A sample
2. A population
3. Sstatistical inference
4. Descriptive statistics

Q7. A set that contains all possible outcomes of a system is known as (1 marks)

Finite Set

1. Infinite Set
2. Universal Set
3. No of these

Q8. If X and Y are independent, then Var(X-Y) is equal to: (1 marks)

Var X Var Y

Var X Var Y

Var X Y

1. Zero

Q9. Which of the following is the class frequency (1 marks)

1. The number of observations in each class
2. The difference between consecutive lower class limits
3. Always contains at least 5 observations
4. Usually a multiple of the lower limit of the first class

Q10. How to construct the class interval: (1 marks)

1. Divide the class frequencies in half
2. Divide the class frequency by the number of observations
3. Find the difference between consecutive lower class limits
4. Count the number of observations in the class