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Null hypothesis is that Mean, u = 170
Alternate hypothesis is that mean, u >170.
Note, we use a greater than sign and not a 'not equal to' sign.
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the h ardness of 25 pieces of ductile iron. The engineer hypothesized that the...
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...
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)...
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....
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.
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....
An engineer measures the weights (in kilograms) of steel pieces. They would like to test H:...
An engineer measures the weights (in kilograms) of steel pieces. They would like to test H: = 5 against H> 5. The weight of a steel piece is normally distributed. They select a random sample size of 25 steel pieces, and compute 76.7 and % = 2.37. We cannot conclude that the mean weight is larger than 5 kg at a level of significance of 1% True False
An engineer measures the weights (in kilograms) of steel pieces. They would like to test H0...
An engineer measures the weights (in kilograms) of steel pieces.
They would like to
test H0 : = 5 against H1 : > 5. The weight of a steel piece is
normally distributed.
They select a random sample size of n = 25 steel pieces, and
compute x = 6:7 and
s = 2:37. We cannot conclude that the mean weight is larger than 5
kg at a level of
significance of 1%.
True False
An engineer measures the weights...
Stats Hw- Please Help 3. A company that manufactures compact fluorescent light bulbs (CFL) claims that...
Stats Hw- Please Help 3. A company that manufactures compact fluorescent light bulbs (CFL) claims that they will operate for a mean of 10,000 hours with a level of significance equal to 0.05. An engineer from the company performs a test to validate this claim. The hypotheses are: Null hypothesis: μ = 10,000 hours Alternate hypothesis: μ ≠ 10,000 hours The engineer does accelerated lifetime testing on 50 of these bulbs and finds that the mean lifetime is 9875 hours...
25 please 25) The quality engineer at a paint manufacturer conducted a hypothesis test to test...
25 please
25) The quality engineer at a paint manufacturer conducted a hypothesis test to test the claim 25) that the mean volume of paint cans had changed after an adjustment in the manufacturinyg process. Mean volume in paint cans before the adjustment was 1.02 gallons. Assume that all conditions for testing have been met. She used technology to complete the hypothesis test. Following is the null and alternative hypothesis and the output from her graphing calculator Ho: ?-1 .02...
Help with this problem , please and thank you ! QUESTION 2 A quality engineer performs...
Help with this problem , please and thank you !
QUESTION 2 A quality engineer performs a one-sample t test on a population mean. The p value for the test is 0.025. Which conclusion should the engineer state? There is a 97.5% probability that Ho is false. Reject Ho, p value is less than 0.05 Accept Ho, p value is less than 0.025 0 There is a 2.5% chance of Ho being wrong. 0
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...
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)...
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....
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....
An engineer measures the weights (in kilograms) of steel pieces. They would like to test H: = 5 against H> 5. The weight of a steel piece is normally distributed. They select a random sample size of 25 steel pieces, and compute 76.7 and % = 2.37. We cannot conclude that the mean weight is larger than 5 kg at a level of significance of 1% True False
An engineer measures the weights (in kilograms) of steel pieces.
They would like to
test H0 : = 5 against H1 : > 5. The weight of a steel piece is
normally distributed.
They select a random sample size of n = 25 steel pieces, and
compute x = 6:7 and
s = 2:37. We cannot conclude that the mean weight is larger than 5
kg at a level of
significance of 1%.
True False
An engineer measures the weights...
25 please
25) The quality engineer at a paint manufacturer conducted a hypothesis test to test the claim 25) that the mean volume of paint cans had changed after an adjustment in the manufacturinyg process. Mean volume in paint cans before the adjustment was 1.02 gallons. Assume that all conditions for testing have been met. She used technology to complete the hypothesis test. Following is the null and alternative hypothesis and the output from her graphing calculator Ho: ?-1 .02...
Help with this problem , please and thank you !
QUESTION 2 A quality engineer performs a one-sample t test on a population mean. The p value for the test is 0.025. Which conclusion should the engineer state? There is a 97.5% probability that Ho is false. Reject Ho, p value is less than 0.05 Accept Ho, p value is less than 0.025 0 There is a 2.5% chance of Ho being wrong. 0
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