Celeritas’s Notes

January 18, 2007

Step by step

Filed under: Uncategorized — celeritas @ 8:55 am

My academic timeline

January 13, 2007

Statistics 2 Test (for myself)

Filed under: Uncategorized — celeritas @ 5:00 pm

This test mainly tests the qualitative bits of the S2 exam. I am more confident on the quantitative parts.

Question 1
State clearly the conditions under which it is appropriate to assume that a random variable has a

(a) binomial distribution (3)

(b) Poisson distribution (3)

Question 2
State the circumstances under which:

(a) a Poisson distribution may be used as an approximation to a binomial distribution (2)

(b) a normal distribution may be used as an approximation to a binomial distribution (3)

(c) a normal distribution may be used as an approximation to a Poisson distribution (1)

Question 3
The continuous uniform distribution has probability density function, f(x) = 1/(b – a) for a to b, and 0 otherwise. Derive:

(a) its mean (5)

(b) its variance (8)

(c) its cumulative distribution function (3)

Question 4
Define:

(a) population (1)

(b) census (2)

(c) sample (2)

(d) sampling unit (1)

(e) sampling frame (2)

(f) statistic (2)

(g) sampling distribution (2)

(h) hypothesis testing (3)

END!

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