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2. An engineer measured the Brinell hardness of 25 pieces of ductile iron that were subcritically...
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....
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...
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....
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:
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.
1. When 385 junior college students were surveyed, 170 said that they have previously 1). owned...
1. When 385 junior college students were surveyed, 170 said that they have previously 1). owned a motorcycle. Find a point estimate for p. the population proportion of students who have previously owned a motorcycle. A) 0.558 B) 0.442 C) 0.306 D) 0.791 2. True or False: The general form of a large-sample (1 - a) 100% confidence interval 2) p(1-P) for a population proportion pis ptz, where p = is the sample proportion of observations with the characteristic of...
Part 1: Hypothesis Testing (25 points) Step 1: Suppose you are asked to conduct a hypothesis...
Part 1: Hypothesis Testing (25 points) Step 1: Suppose you are asked to conduct a hypothesis test on the population mean. What type of hypothesis test would you use? What assumptions do you need to make about the process when you are conducting a hypothesis test on the population mean in order for your results to be valid? This needs to be at least one (1) paragraph in length. Note a paragraph contains at least three complete sentences. Watch your...
Please help with BOTH 1) 2) Tensile strength tests were carried out on two different grades of wire rod, resulting in th...
Please help with BOTH
1)
2)
Tensile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data. Grade AISI 1064 AISI 1078 Sample Size m = 129 n = 129 Sample Mean (kg/mm) x= 109.3 y = 129.9 Sample SD 51 = 1.1 52 = 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...
According to a union agreement, the mean income for all senior-level assembly-line workers in a large...
According to a union agreement, the mean income for all senior-level assembly-line workers in a large company equals $500 per week. A representative of a women's group decides to analyze whether the mean income for female employees matches this norm. For a random sample of nine female employees, Y¯=410Y¯=410 and sY=90sY=90. a. Conduct a hypothesis test of whether the mean income of female employees differs from $500 per week. Include all assumptions, the hypotheses, test statistic, and p-value, and interpret...
need help with the last questions. Prothrombin time is a measure of the clotting ability of...
need help with the last questions.
Prothrombin time is a measure of the clotting ability of blood. For 10 rats treated with an antibiotic and 10 control rats, the prothrombin times (in seconds) were reported as follows: Control Antibiotic 10 25 10 23 sample mean sample standard deviation 10 (a) (3 points) What is the explanatory variable? Is it categorical or quantitative? Explanatory variable is type of treatment and is categorical. (b) (3 points) What is the response variable? Is...
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....
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...
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....
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:
1. When 385 junior college students were surveyed, 170 said that they have previously 1). owned a motorcycle. Find a point estimate for p. the population proportion of students who have previously owned a motorcycle. A) 0.558 B) 0.442 C) 0.306 D) 0.791 2. True or False: The general form of a large-sample (1 - a) 100% confidence interval 2) p(1-P) for a population proportion pis ptz, where p = is the sample proportion of observations with the characteristic of...
Please help with BOTH
1)
2)
Tensile strength tests were carried out on two different grades of wire rod, resulting in the accompanying data. Grade AISI 1064 AISI 1078 Sample Size m = 129 n = 129 Sample Mean (kg/mm) x= 109.3 y = 129.9 Sample SD 51 = 1.1 52 = 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...
need help with the last questions.
Prothrombin time is a measure of the clotting ability of blood. For 10 rats treated with an antibiotic and 10 control rats, the prothrombin times (in seconds) were reported as follows: Control Antibiotic 10 25 10 23 sample mean sample standard deviation 10 (a) (3 points) What is the explanatory variable? Is it categorical or quantitative? Explanatory variable is type of treatment and is categorical. (b) (3 points) What is the response variable? Is...
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