i have this hypothesis testing question: ive dont the first half but not sure on what to do for the second (iii) and (iv)
1) sweets called "scruffies" are sold in packs of 18
they come in a variety of colours, and market research shows red is the most populat. they are packed randomly and on average 25% are red
(i) find p of no more than 6 red
X-B(18,0.25)
p(X≤6) = 0.86101...
(ii) find p of exactly 4
p(X=4) = 0.21298...
(iii) 1 in 10 contain 19 sweets instead of 18. what is the p of exactly 4 now
(iv) to inscrease sales manufacturer sais increase production of red. (assume contail 18 per pack). pack contains 8 scruffies. test at the 5% significance level if this supports the claim
h0= p=0.25
h1= p≠ 0.25
assume h0 to be true, X-B(18,0.25)
How do you do (iii) and (iv). help would be great in the right direction for these