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1. The current accepted mean of Brinell hardness is 170. An engineer measured the Brinell hardness...
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)...
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....
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.
Serum Systolic Serum Systolic Serum Systolic Serum Systolic Serum Systolic 04 137 183115 218 145 209 170 195 115 Question 1a: Data a. Use the proportion from question 1a. Test the claim that t...
Serum Systolic Serum Systolic Serum Systolic Serum Systolic Serum Systolic 04 137 183115 218 145 209 170 195 115 Question 1a: Data a. Use the proportion from question 1a. Test the claim that the Sample 153 127 193 146 173 194 163 201...-174--157 proportion of Asianssi-s than 25%, use 219 ; 1191 163 160 174,160 140 Proportion 0.2 Critical Value 1.645 Margin of Error 0.0658 144 140 145 177 152166175 200 131 Hypotheses: You may write HO and Hl Test...
Question 1 (1 point) Scores on a test have a mean of 66 and a standard...
Question 1 (1 point) Scores on a test have a mean of 66 and a standard deviation of 9. Michelle has a score of 57. Convert Michelle's score to a z score. 12 Question 2 (1 point) 15 Determine the quartile or interquartile range as specified. The weights (in pounds) of 18 randomly selected adults are given below. Find the third quartile, Qs- 7 18 120 165 187 143 119 132 127 156 179 159 180 202 114 146 si...
Can someone show me how to work these problems out, step by step. 6. A doctor...
Can someone show me how to work these problems out, step by
step.
6. A doctor is interested in determining whether a film about excercise will change about exercise. The results of his questionnaire are shown. A higher numerical vi value shows a Before Ater 12 vorable attitude toward exercise. Is there enough evidence to support the c claim. use (?? 0.05 13 12 14 A sample of 150 people from a certain industrial community showed that 80 people suffered...
Sample A SUBJ WTPRE WTPST Sa SEX WTLOSS var 1 165 160 M -5 2 202...
Sample A SUBJ WTPRE WTPST Sa SEX WTLOSS var 1 165 160 M -5 2 202 200 M -2 3 256 259 M 3 4 155 156 M 1 5 175 162 M -13 6 180 187 M 7 174 172 M -2 8 136 138 M 2 9 168 162 M -6 10 155 155 M 0 11 220 205 M - 15 12 163 153 M -10 13 159 150 M -9 14 253 255 F 15 138...
Download the hypothesis testing dataset from the class website. 1. This is case 1, in which...
Download the hypothesis testing dataset from the class website. 1. This is case 1, in which the value of population standard deviation is assumed to be known. a. Compute the standard deviation of the textbook price and assume this to be the population standard deviation. Type this value in E5. b. Pick a random sample of size 15. c. Compute the mean of your random sample in E4 using the AVERAGE function. d. Calculate the standard error in cell E9...
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)...
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....
Serum Systolic Serum Systolic Serum Systolic Serum Systolic Serum Systolic 04 137 183115 218 145 209 170 195 115 Question 1a: Data a. Use the proportion from question 1a. Test the claim that the Sample 153 127 193 146 173 194 163 201...-174--157 proportion of Asianssi-s than 25%, use 219 ; 1191 163 160 174,160 140 Proportion 0.2 Critical Value 1.645 Margin of Error 0.0658 144 140 145 177 152166175 200 131 Hypotheses: You may write HO and Hl Test...
Question 1 (1 point) Scores on a test have a mean of 66 and a standard deviation of 9. Michelle has a score of 57. Convert Michelle's score to a z score. 12 Question 2 (1 point) 15 Determine the quartile or interquartile range as specified. The weights (in pounds) of 18 randomly selected adults are given below. Find the third quartile, Qs- 7 18 120 165 187 143 119 132 127 156 179 159 180 202 114 146 si...
Can someone show me how to work these problems out, step by
step.
6. A doctor is interested in determining whether a film about excercise will change about exercise. The results of his questionnaire are shown. A higher numerical vi value shows a Before Ater 12 vorable attitude toward exercise. Is there enough evidence to support the c claim. use (?? 0.05 13 12 14 A sample of 150 people from a certain industrial community showed that 80 people suffered...
Sample A SUBJ WTPRE WTPST Sa SEX WTLOSS var 1 165 160 M -5 2 202 200 M -2 3 256 259 M 3 4 155 156 M 1 5 175 162 M -13 6 180 187 M 7 174 172 M -2 8 136 138 M 2 9 168 162 M -6 10 155 155 M 0 11 220 205 M - 15 12 163 153 M -10 13 159 150 M -9 14 253 255 F 15 138...
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