Homework Answers
The statistic software output for this problem is:
t = 8.36
P-value = 0.000
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Polymer composite materials have gained popularity because they have high strength to weight ratios and are...
Polymer composite materials have gained popularity because they have high strength to weight ratios and are...
Polymer composite materials have gained popularity because they have high strength to weight ratios and are relatively easy and inexpensive to manufacture. However, their nondegradable nature has prompted development of environmentally friendly composites using natural materials. An article reported that for a sample of 10 specimens with 2% fiber content, the sample mean tensile strength (MPa) was 51.3 and the sample standard deviation was 1.1. Suppose the true average strength for 0% fibers (pure cellulose) is known to be 48...
Polymer composite materials have gained popularity because they have high strength to weight ratios and are...
Polymer composite materials have gained popularity because they have high strength to weight ratios and are relatively easy and inexpensive to manufacture. However, their nondegradable nature has prompted development of environmentally friendly composites using natural materials. An article reported that for a sample of 10 specimens with 2% fiber content, the sample mean tensile strength (MPa) was 51.1 and the sample standard deviation was 1.2. Suppose the true average strength for 0% fibers (pure cellulose) is known to be 48...
Tensile strength tests were carried out on two different grades of wire rod, resulting in the...
Tensile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data. Sample Mean Sample Size Sample (kg/mm2) Grade SD x = 105.6 S1 1.2 AISI 1064 m 127 y 126.1 n 127 AISI 1078 S2=2.0 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than 10 kg/mm2? Test the appropriate hypotheses using a significance level of 0.01....
Tensile strength tests were carried out on two different grades of wire rod, resulting in the...
Tensile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data. Grade Sample Size Sample Mean (kg/mm2) Sample SD AISI 1064 m = 126 x = 105.4 s1 = 1.1 AISI 1078 n = 126 y = 124.7 s2 = 2.1 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than 10 kg/mm2? Test the appropriate hypotheses...
sile strength tests were carried out on two different grades of wire rod, resulting in the...
sile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data 1:37:02 Sample Sample Mean Sample Grade Size (kg/mm) SD AISI 1064 m 128 x = 109.25. - 1.1 AISI 1078 n-128 9 - 129.5 52-2.1 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than komm? Test appropriate hypotheses using a significance level of 0.01. State...
Tensile strength tests were carried out on two different grades of wire rod. resulting in the...
Tensile strength tests were carried out on two different grades of wire rod. resulting in the accompanying data. Grade Sample Size Sample Mean (kg/mm2) Sample SD AISI 1064 m = 126 X = 105.4 $1 = 1.1 AISI 1078 n = 126 y = 124.7 52 = 2.1 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than 10 kg/mm2? Test the appropriate hypotheses...
Tensile strength tests were carried out on two different grades of wire rod, resulting in the...
Tensile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data. Sample Size Sample SD Grade Sample Mean (kg/mm2) = 109.4 y = 121.2 AISI 1064 m = 126 $1 = 1.2 AISI 1078 n = 126 S2 = 2.1 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than 10 kg/mm2? Test the appropriate hypotheses using...
Tensile strength tests were carried out on two different grades of wire rod, resulting in the...
Tensile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data. Sample Size Sample SD Grade Sample Mean (kg/mm2) x = 108.8 y = 129.7 AISI 1064 m = 128 $1 = 1.1 s2 = 2.1 AISI 1078 n = 128 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than 10 kg/mm2? Test the appropriate hypotheses...
2. The article "Uncertainty Estimation in Railway Track Life-Cycle Cost"+ presented the following data on time...
2. The article "Uncertainty Estimation in Railway Track Life-Cycle Cost"+ presented the following data on time to repair (min) a rail break in the high rail on a curved track of a certain railway line. 159 120 480 149 270 547 340 43 228 202 240 218 A normal probability plot of the data shows a reasonably linear pattern, so it is plausible that the population distribution of repair time is at least approximately normal. The sample mean and standard...
reports Tensile strength tests were carried out on two different grades of wire rod, resulting in...
reports Tensile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data Sample Sample Mean Grade Sample Sire (kg/mm2) SD 1:00:02 AISI 1064 m - 120 x 109.2 - 1.1 AISI 1078 128 y = 129.552 - 2.1 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 gade by more than 10 Test appropriate hypotheses using a significance level of...
Polymer composite materials have gained popularity because they have high strength to weight ratios and are relatively easy and inexpensive to manufacture. However, their nondegradable nature has prompted development of environmentally friendly composites using natural materials. An article reported that for a sample of 10 specimens with 2% fiber content, the sample mean tensile strength (MPa) was 51.3 and the sample standard deviation was 1.1. Suppose the true average strength for 0% fibers (pure cellulose) is known to be 48...
Polymer composite materials have gained popularity because they have high strength to weight ratios and are relatively easy and inexpensive to manufacture. However, their nondegradable nature has prompted development of environmentally friendly composites using natural materials. An article reported that for a sample of 10 specimens with 2% fiber content, the sample mean tensile strength (MPa) was 51.1 and the sample standard deviation was 1.2. Suppose the true average strength for 0% fibers (pure cellulose) is known to be 48...
Tensile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data. Sample Mean Sample Size Sample (kg/mm2) Grade SD x = 105.6 S1 1.2 AISI 1064 m 127 y 126.1 n 127 AISI 1078 S2=2.0 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than 10 kg/mm2? Test the appropriate hypotheses using a significance level of 0.01....
Tensile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data. Grade Sample Size Sample Mean (kg/mm2) Sample SD AISI 1064 m = 126 x = 105.4 s1 = 1.1 AISI 1078 n = 126 y = 124.7 s2 = 2.1 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than 10 kg/mm2? Test the appropriate hypotheses...
sile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data 1:37:02 Sample Sample Mean Sample Grade Size (kg/mm) SD AISI 1064 m 128 x = 109.25. - 1.1 AISI 1078 n-128 9 - 129.5 52-2.1 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than komm? Test appropriate hypotheses using a significance level of 0.01. State...
Tensile strength tests were carried out on two different grades of wire rod. resulting in the accompanying data. Grade Sample Size Sample Mean (kg/mm2) Sample SD AISI 1064 m = 126 X = 105.4 $1 = 1.1 AISI 1078 n = 126 y = 124.7 52 = 2.1 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than 10 kg/mm2? Test the appropriate hypotheses...
Tensile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data. Sample Size Sample SD Grade Sample Mean (kg/mm2) = 109.4 y = 121.2 AISI 1064 m = 126 $1 = 1.2 AISI 1078 n = 126 S2 = 2.1 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than 10 kg/mm2? Test the appropriate hypotheses using...
Tensile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data. Sample Size Sample SD Grade Sample Mean (kg/mm2) x = 108.8 y = 129.7 AISI 1064 m = 128 $1 = 1.1 s2 = 2.1 AISI 1078 n = 128 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than 10 kg/mm2? Test the appropriate hypotheses...
2. The article "Uncertainty Estimation in Railway Track Life-Cycle Cost"+ presented the following data on time to repair (min) a rail break in the high rail on a curved track of a certain railway line. 159 120 480 149 270 547 340 43 228 202 240 218 A normal probability plot of the data shows a reasonably linear pattern, so it is plausible that the population distribution of repair time is at least approximately normal. The sample mean and standard...
reports Tensile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data Sample Sample Mean Grade Sample Sire (kg/mm2) SD 1:00:02 AISI 1064 m - 120 x 109.2 - 1.1 AISI 1078 128 y = 129.552 - 2.1 (a) Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 gade by more than 10 Test appropriate hypotheses using a significance level of...
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