Recent content by axnman

Test and CI for Two Proportions Sample X N Sample p 1 3 839 0.003576 2 20 1662 0.012034 Difference = p (1) - p (2) Estimate for difference: -0.00845801 95% upper bound for difference: -0.00290435 Test for difference = 0 (vs < 0): Z = -2.51 P-Value =...

Hi need some clearance of idea: A process produces rubber belts in lots of sizes 2,500. Inspection records on the last 20 lots reveal the following data: then u have data in the format: Lot Number non-conforming belts 1 230 2 235...

Jus some confusion over plotting points on normal probability paper.. 1. Order the data 2. Do we do (i-0.5)/n where i=no. of observation and n= no. of samples? believe can't use Z(i)= (X(i)- Mean)/ stand. dev. as i need to find both mean and std. dev from the graph... What is the graph...

here is the actual question : Samples of n=4 items are taken from a process at regular intervals. Suppose process mean is 200 and stnd. dev. =10 Assume the following rule is applied to control chart with 3-sigma limits: The process is declared out of control when either a point plots...

Ya statistics situation...sorry @ that,... basically want to calculate the probability of detecting the shift on the first or the second sample when mean (say 200) shifts to a new value = mean + 9 (say 209)...(an out control situation is given as : if 1 point plots outside 3-sigma limits or...

Process is Out of control if 1 point plots outside 3-sigma limits or 2 consecutive points between 2-sigma & 3-sigma on same side... if mean changes to mean1=mean0 + 9...what is probability to detect shift on 1st or 2nd sample following shift? Point outside 3 sigma is ok but what @ the 2...

z = (X - µ ) / σ...am talking @ que. 2...This way z = (1.5-1.49) / 0.005 = 2...Then i get confused as i have to look into the tables...I get 0.0228...hmmm so well the answer should be 100 - 0.0228 % of shafts = 97.72%...Is that correct? Q 1 am still trying...

solved thanks

Que. 1 Consider a Gaussian PDF with µ = 20, σ = 30, a = 50 and b =80. Determine i)Probability that P(x>b) ii)P(x ≤ b) iii)P(x ≤ - b) iv)P(a ≤ x ≤ b) Que. 2 In a certain manufacturing process only shafts whose diameters are less than 1.5 inches can be used. Given the shaft diameters are...

Que. 1 : In a mech. sys. 5 bulbs are used and system will operate if any 3 are functioning. Given that 15% of bulbs are defective , with aid of binomial PDF determine what are the chances that the system will malfunction? Que. 2 : Suppose 15% of total population of tubes is defective and...