After a process change a measurement of the hardness of 25 pieces of sub-critically annealed iron...
After a process change a measurement of the hardness of 25
pieces of sub-critically annealed iron produced a mean hardness, ¯
x, of 173.13 with a standard deviation of 11.09. Construct the
relevant hypotheses at α = 0.05 and test to determine if there is
significant evidence to suggest that the new process would have a
hardness greater that 170.
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After a process change a measurement of the hardness of 25
pieces of sub-critically annealed iron...
1. The current accepted mean of Brinell hardness is 170. An engineer measured the Brinell hardness...
1. The current accepted mean of Brinell hardness is 170. An engineer measured the Brinell hardness of 25 pieces of ductile iron that were sub- critically annealed. The resulting data were: 170 167174 179 179 187 179 183 179 156 163 156 187 156 167 156 174 170 183179174 179 170 159187 The engineer hypothesized that the mean Brinell hardness of all such ductile iron pieces is greater than 170 and is actually 172.5 with a standard deviation of 10.31....
2. An engineer measured the Brinell hardness of 25 pieces of ductile iron that were subcritically...
2. An engineer measured the Brinell hardness of 25 pieces of ductile iron that were subcritically annealed. The resulting data were computed: Sample size Sample mean Sample variance 25 175.52 10.31 Table 1 The engineer hypothesized that the mean Brinell hardness of all such ductile iron pieces is greater than 170. Answer the questions below: (a) State the test statistic we need to use to test his/hers hypothesis. (b) State two assumptions you would need to perform the inference. (c)...
The Brinell hardness of ductile iron is known to be no more than 168. An engineer...
The Brinell hardness of ductile iron is known to be no more than 168. An engineer measured the Brinell hardness of 32 pieces of ductile iron that were subcritically annealed. The resulting data were: 170 167 174 179 179 187 179 183 156 163 156 187 156 167 156 174 183 179 174 179 170 159 187 165 190 175 177 160 178 149 169 171 a) Compute the Mean and Variance of the Sample above. b) The engineer hypothesized...
Please help the h ardness of 25 pieces of ductile iron. The engineer hypothesized that the...
Please help
the h ardness of 25 pieces of ductile iron. The engineer hypothesized that the mean hardness of all such ductile iron pieces is greater than 170. Therefore, he was interested in testing the hypotheses:
Hi, could anyone explain to me how to do these questions? I'm a little confused. (15...
Hi, could anyone explain to me how to do these questions? I'm a
little confused.
(15 points) 1. The FBI compiles data on robbery and property crimes and publishes the information. A ran- dom sample of pickpocket offenses yielded the losses, in dollars, described by the following summary statistics: x = 513.32, s = 262.23, and n = 20. We want to use this data to make inference on u, the mean loss in all pickpocket offenses in the U.S....
5. The diameters of steel shafts produced by a certain manufacturing process should have a mean...
5. The diameters of steel shafts produced by a certain manufacturing process should have a mean diameter of 0.255 inches. The diameter is known to have a standard deviation of σ= 0.0001 inch. A random sample of 10 shafts has an average diameter of 0.2545 inches. (a) Set up the appropriate hypotheses on the mean μ (b) Test these hypotheses using α: 0.05, what are your conclusions? (c) Find the P-value for this test. P 2.6547x1055
A hospital was concerned about reducing its wait time. A targeted wait time goal of 25...
A hospital was concerned about reducing its wait time. A targeted wait time goal of 25 minutes was set. After implementing an improvement framework and process, a sample of 332 patients showed the mean wait time was 23.14 minutes, with a standard deviation of 16.05 minutos. Complete parts (a) and (b) below. a. If you test the null hypothesis at the 0.05 level of significance, is there evidence that the population mean wait time is less than 25 minutes? State...
A hospital was concerned about reducing its wait time. A targeted wait time goal of 25...
A hospital was concerned about reducing its wait time. A targeted wait time goal of 25 minutes was set. After implementing an improvement framework and process, a sample of 362 patients showed the mean wait time was 23.16 minutes, with a standard deviation of 16. 1 minutes. Complete parts (a) and (b) below. a. If you test the null hypothesis at the 0.05 level of significance, is there evidence that the population mean wait time is less than 25 minutes?...
In a test of the effectiveness of garlic for lowering cholesterol, 36 subjects were treated with...
In a test of the effectiveness of garlic for lowering cholesterol, 36 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.6 and a standard deviation of 23.5. Use a 0.05 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about...
(7 pts) From previous studies, it has been generally believed that Northern Hemisphere icebergs have a mean depth of 27...
(7 pts) From previous studies, it has been generally believed that Northern Hemisphere icebergs have a mean depth of 270 meters and a standard deviation of 20 meters. An environmentalist has suggested that global warming has caused icebergs to have greater depth. A team of scientists visiting the Northern Hemisphere observed a random sample of 41 icebergs. The depth of the base of the iceberg below the surface was carefully measured for each and the sample mean and standard deviation...
1. The current accepted mean of Brinell hardness is 170. An engineer measured the Brinell hardness of 25 pieces of ductile iron that were sub- critically annealed. The resulting data were: 170 167174 179 179 187 179 183 179 156 163 156 187 156 167 156 174 170 183179174 179 170 159187 The engineer hypothesized that the mean Brinell hardness of all such ductile iron pieces is greater than 170 and is actually 172.5 with a standard deviation of 10.31....
2. An engineer measured the Brinell hardness of 25 pieces of ductile iron that were subcritically annealed. The resulting data were computed: Sample size Sample mean Sample variance 25 175.52 10.31 Table 1 The engineer hypothesized that the mean Brinell hardness of all such ductile iron pieces is greater than 170. Answer the questions below: (a) State the test statistic we need to use to test his/hers hypothesis. (b) State two assumptions you would need to perform the inference. (c)...
The Brinell hardness of ductile iron is known to be no more than 168. An engineer measured the Brinell hardness of 32 pieces of ductile iron that were subcritically annealed. The resulting data were: 170 167 174 179 179 187 179 183 156 163 156 187 156 167 156 174 183 179 174 179 170 159 187 165 190 175 177 160 178 149 169 171 a) Compute the Mean and Variance of the Sample above. b) The engineer hypothesized...
Please help
the h ardness of 25 pieces of ductile iron. The engineer hypothesized that the mean hardness of all such ductile iron pieces is greater than 170. Therefore, he was interested in testing the hypotheses:
Hi, could anyone explain to me how to do these questions? I'm a
little confused.
(15 points) 1. The FBI compiles data on robbery and property crimes and publishes the information. A ran- dom sample of pickpocket offenses yielded the losses, in dollars, described by the following summary statistics: x = 513.32, s = 262.23, and n = 20. We want to use this data to make inference on u, the mean loss in all pickpocket offenses in the U.S....
5. The diameters of steel shafts produced by a certain manufacturing process should have a mean diameter of 0.255 inches. The diameter is known to have a standard deviation of σ= 0.0001 inch. A random sample of 10 shafts has an average diameter of 0.2545 inches. (a) Set up the appropriate hypotheses on the mean μ (b) Test these hypotheses using α: 0.05, what are your conclusions? (c) Find the P-value for this test. P 2.6547x1055
A hospital was concerned about reducing its wait time. A targeted wait time goal of 25 minutes was set. After implementing an improvement framework and process, a sample of 332 patients showed the mean wait time was 23.14 minutes, with a standard deviation of 16.05 minutos. Complete parts (a) and (b) below. a. If you test the null hypothesis at the 0.05 level of significance, is there evidence that the population mean wait time is less than 25 minutes? State...
A hospital was concerned about reducing its wait time. A targeted wait time goal of 25 minutes was set. After implementing an improvement framework and process, a sample of 362 patients showed the mean wait time was 23.16 minutes, with a standard deviation of 16. 1 minutes. Complete parts (a) and (b) below. a. If you test the null hypothesis at the 0.05 level of significance, is there evidence that the population mean wait time is less than 25 minutes?...
In a test of the effectiveness of garlic for lowering cholesterol, 36 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.6 and a standard deviation of 23.5. Use a 0.05 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about...
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