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# STA301 statistics and probability Online Quiz No. 03 Solution and Discussion Due Date: January 28, 2014 at 11:59PM

Dear Students,
You are informed that Quiz no.3 will be started according to the following schedule;

Opening Date and Time of Quiz January 27, 2014 at 12:01AM
Closing Date and Time  of Quiz January 28, 2014 at 11:59PM

Instructions:

Read the following instructions carefully before attempting the Quiz No.3.

•        Quiz will be based upon Multiple Choice Questions (MCQs) and it will cover Lesson nos. 21 to Lesson nos. 30.

•        You can start attempting the quiz any time within given date(s) and time of a particular subject by clicking the link for Quiz in LMS.

•         Each question has a fixed time of 90 seconds. So you have to save your answer before 90 seconds. But due to unstable internet speeds, it is recommended that you should save your answer within 60 seconds. While attempting a question, keep an eye on the remaining time.

•         Attempting quiz is unidirectional. Once you move forward to the next question, you can not go back to the previous one. Therefore before moving to the next question, make sure that you have selected the best option.

•         DO NOT press back button while attempting a question; otherwise you will lose a question.

•         DO NOT refresh the page unnecessarily.

•         DO NOT try to disable “JavaScript” in your browser; otherwise you will not be able to attempt the quiz.

•         If for any reason, you lose access to internet (like power failure or disconnection of internet); you will be able to attempt the quiz again from the position where you left in last attempt. But remember that you have to complete the quiz before expiry of the deadline

Solved Quiz No.3 enjoy.

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# sat301

Sta301 quiz

 The marginal p.d.f. of any continuous variables is obtained by ___________ the other variable from the joint p.d.f.

Dividing                                                                            Averaging

Multiplying

Integrating

 If one event is not affected by the outcome of the other event, the two events are said to be:

Dependent              Independent

Not Mutually Exclusive                       Mutually Exclusive

 When a coin is tossed 3 times, the probability of getting 3 tails is

½

3/8

1/9

2/8

 Binomial distribution is skewed to the right if:

P = n

P = q

P<q

p>q

 In a bivarite probability distribution of X and Y, If E(X)=3 and E(Y)=5, then E(X-Y)= ?

2

-2

15

None of above

 Which type of data is used in the binomial distribution?

Discrete data only

Continues data only

Qualitative data only

Both discrete and continuous

 Using the normal approximation to the binomial distribution with n= 3 and p= 0.0571 the value of mean is:

0.1713

0.2132

0.5133

0.1923

 Suppose 60% of a herd of cattle is infected with a particular disease. Let Y = the number of non-diseased cattle in a sample of size 5. the distribution of Y is:

Binomial with n = 5 and p = 0.6

Binomial with n = 5 and p = 0.4

Binomial with n = 5 and p = 0.5

Poisson with u = .6

 From the following table, x 0 1 2 3 f (x) 0.26 0.49 0.22 0.02 E (2X+1) will be:

1.98

2.98

0.99

2

 If X and Y are independent random variables, then Cov (X, Y) =

0.5

0

2

1

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