Makers of brand A centralized server PCs guarantee that upkeep costs are lower for their gear than for that of their closest rival. Prior to buying brand A. an organization makes a free examination of this case. Tests of fix records are gotten from clients of the two kinds of gear. These information result: Brand A Contender

nt = 75 II = I 0 Wm = 5937

(a) What is E[Wmp (b) What is Var Wm?

(c) Do the information uphold the case of the producers of brand A gear? Clarify, in view of the P estimation of your test.

Question 98

An investigation of visual and hear-able response time is led for a gathering of school ball players. Visual response time is estimated when expected to react to a light sign, and hear-able response time is estimated when expected to react to the sound of an electric switch. Fifteen subjects were estimated with time recorded to the closest millisecond:

Subject Visual Hear-able 1 161 157 2 203 207 3 235 198 4 176 161 5 201 234 6 188 197 7 228 180 8 211 165 9 191 202 10 178 193 11 159 173 12 227 137 13 193 182 14 192 159 15 212 156

Is there proof that the visual response time will in general be more slow than the hear-able response time?

Question 99

An analysis was directed to think about the presence of two kinds of paint on houses after ordinary openness for a time of 2 years. Twenty sets of also developed homes were chosen, and brand A paint was applied to one place of each pair and brand B was applied to the next individual from each agony Following 2 years a paint master was approached to pass judgment on the appearances of the two brands for each pair of houses. A>B and B > A signifies the request for favored appearance of A liked to BandB liked to A, individually. The result of the trial is as per the following:

Pair 1 A>13 6 B>A 11 A>B 16 A>B 2 A>B 7 B>A 12 A>B 17 B>A 3 B > A 8 A>B 13 A>B 18 A>B 4 A>B 9 B>A 14 B>A 19 A>B 5 A>B 10 A>B 15 A>B 20 A>B

Utilizing a suitable test, test the theory that the two brands of paint are similarly liked as far as appearance following 2 years.

Question 100

A composite of 6/6 nylon and steel is being read for conceivable use in cam gears. Sixteen cog wheels of various sorts are created, and the clamor level acquired utilizing these cog wheels is contrasted with that of an indistinguishable stuff made of cast iron. These information are acquired:

Clamor level in dB

Stuff Cast iron Composite 1 75 74 2 90 88 3 80 81 4 60 5 110 107 6 95 92 7 93 90 8 88 84 9 70 66 10 65 64 11 91 86 12 100 97 13 85 83 14 50 44 15 62 60 16 67 64

(a) Build a stem-and-leaf graph for the distinctions in the commotion levels for the two cog wheels. Take away in the request cast iron short composite. Does it create the impression that these distinctions are roughly typically circulated?

(b) Track down a 95% certainty span on the mean contrast in the decrease in the commotion level. Does it create the impression that pinion wheels produced using the composite have a below decibel level than those produced using solid metal? Clarify.