A value has been measured by Instrument A imes with a standard deviation of 4.3. Anoth as been measured 7 times with Instrument Vithin what range will the standard deviation nstrument B observation have to fall to be considered equivalent quality at a 95% confie evel? Hint: Use the F-Distribution.

Assume that n the population of all students who take the SAT test, the total scores are normally distributed 1509 and std. deviation=312. What proportion of SAT scores fall below 18507 with a mean = Pigure 3a SAT Scores, Mean 1508, St Dev -312 Green area= the proportion of scores less than 1850. 1650

. 2) A following figure and table display creep test data obtained from a uniaxial specimen having an initial gauge length of 2 cm. Calculate the steady-state creep rate. Length |(cm) 2.3 Time | (h) 2.25 2.004 2.2 100 2.010 200 2.020 400 2.030 1000 2000 2.045 2.075 2.1 2.05 4000 2.135 6000 2.193 7000 2.230 1.95 8000 2.300 1000 2000 3000 4000 5000 6000 7000 8000 Time (h) (rupture) | Length between the gauge marks (cm) 2.

7. Repeat the experiment using a second and third rod of different material. Data Table: T; °C Lo m Aluminum 0.30 Material AL m T; °C AT °C 5.44 x 10-4 24.6 100.2 0.29 4.21 x 10-4 23.5 99.9 Brass 0.30 3.83 х 104 25.0 100 Copper Data Analysis Table Experimental a Accepted a /°C 24 x 10-6 Material Error % Aluminum 19 х 106 Brass 17x 10-6 Сopper