1) If a large number of samples of size n are taken from B(20,0.2) and approximately 90% of the sample means are less than 4.354, estimate n.
2) i. The random variable has the distribution . Given that and are to independent observations of , find
ii. The random variable is related to by the formula , where and are constants with . Given that , find the values of and , and hence find the values of a and b.
Apr 3rd 2011, 06:34 AM
1) If X is the corresponding random variable, then
Find the inverse cdf of a standard normal distribution having cumulative probability ; that will be equal to . Then solve for .
2)i) HINT: You have to find where
ii) HINT: The distribution of Y is symmetric about . So the mean of is . For variance, replace by and proceed.
Apr 4th 2011, 06:11 AM
for 1), i did as you taught me to, but the answer given for n is 42 whereas i got 0.00134182 oO
and as for the rest, i got them! thanks!!
Apr 4th 2011, 06:31 AM
Horrible mistake! I read it normal instead of binomial! The LHS will be