CIE AS statistics

[sweetie]

cud sum1 tell me when do we use the continuity factor in the normal distribution calculations?

[immortal]

A continuity factor is used when you use a continuous function to approximate a discrete one; when you use a normal distribution table to approximate a binomial, you’re going to have to use a continuity correction factor. It’s as simple as adding or subtracting.
Dat is we u find da mean & S.D  from X ~ B(n,p) den mean=np  &  Var(X)=np(1-p)

[sweetie]

Thank You

cud u also tell me when do we know if order matters or no??

check Q4

[immortal]

4 Permutations(P) the order matters dat is, as per question 4) each passenger is unique & da word "arrangement" is specified, as 4 Combinations(C) the order does not matter.
as fo part iii> dey asked how da passengers can b "chosen" so v shud solve using combination.

[sweetie]

Thank You

[sweetie]

cn u tell me , whether the mean or the standard deviation in normal distribution cn be neg.?

nd when we   say: "........that there r 90 or fewer tapes....."
 do i take the continuity factor as 90.5 or 89.5???

[sweetie]

cn u tell me , whether the mean or the standard deviation in normal distribution cn be neg.?

nd when we   say: "........that there r 90 or fewer tapes....."
 do i take the continuity factor as 90.5 or 89.5???