An investigator compares the durability of two different compounds used in the manufacture of a certain automobile brake lining. A sample of 259259brakes using Compound 1 yields an average brake life...
An investigator compares the durability of two different compounds used in the manufacture of a certain automobile brake lining. A sample of 259259brakes using Compound 1 yields an average brake life of 47,112 miles. A sample of 218 brakes using Compound 2 yields an average brake life of 30,86430,864 miles. Assume the standard deviation of brake life is known to be 16811681 miles for brakes made with Compound 1 and 1627 miles for brakes made with Compound 2. Determine the 98%98% confidence interval for the true difference between average lifetimes for brakes using Compound 1and brakes using Compound 2.
Step 1 of 2:
Find the critical value that should be used in constructing the confidence interval.
Step 2 of 2:
Construct the 98%98% confidence interval. Round your answers to the nearest whole number.
upper and lower level
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An investigator compares the durability of two different compounds used in the manufacture of a certain automobile brake lining. A sample of 259259brakes using Compound 1 yields an average brake life...
An investigator compares the durability of two different compounds used in the manufacture of a certain...
An investigator compares the durability of two different compounds used in the manufacture of a certain automobile brake lining. A sample of 259259brakes using Compound 1 yields an average brake life of 47,112 miles. A sample of 218 brakes using Compound 2 yields an average brake life of 30,86430,864 miles. Assume the standard deviation of brake life is known to be 16811681 miles for brakes made with Compound 1 and 1627 miles for brakes made with Compound 2. Determine the 98%98%...
An investigator compares the durability of two different compounds used in the manufacture of a certain...
An investigator compares the durability of two different compounds used in the manufacture of a certain automobile brake lining. A sample of 259 brakes using Compound 1 yields an average brake life of 47,112 miles. A sample of 218 brakes using Compound 2 yields an average brake life of 30,864 miles. Assume that the population standard deviation for Compound 1 is 1681 miles, while the population standard deviation for Compound 2 is 1627 miles. Determine the 98% confidence interval for...
An investigator compares the durability of two different compounds used in the manufacture of a certain...
An investigator compares the durability of two different compounds used in the manufacture of a certain automobile brake lining. A sample of 138 brakes using Compound 1 yields an average brake life of 30,636 miles. A sample of 111 brakes using Compound 2 yields an average brake life of 43,730 miles. Assume that the population standard deviation for Compound 1 is 3899 miles, while the population standard deviation for Compound 2 is 1161 miles. Determine the 95% confidence interval for...
A researcher compares the effectiveness of two different instructional methods for teaching anatomy. A sample of...
A researcher compares the effectiveness of two different instructional methods for teaching anatomy. A sample of 175 students using Method 1 produces a testing average of 89.6. A sample of 177 students using Method 2 produces a testing average of 68.8. Assume the standard deviation is known to be 17.56 for Method 1 and 5.07 for Method 2. Determine the 98% confidence interval for the true difference between testing averages for students using Method 1 and students using Method 2....
A researcher compares the effectiveness of two different instructional methods for teaching anatomy. A sample of...
A researcher compares the effectiveness of two different instructional methods for teaching anatomy. A sample of 149 students using Method 1 produces a testing average of 54.8. A sample of 180 students using Method 2 produces a testing average of 53.2. Assume the standard deviation is known to be 5.1 for Method 1 and 12.47 for Method 2. Determine the 90% confidence interval for the true difference between testing averages for students using Method 1 and students using Method 2....
A researcher compares the effectiveness of two different instructional methods for teaching physiology. A sample of...
A researcher compares the effectiveness of two different instructional methods for teaching physiology. A sample of 169 students using Method 1 produces a testing average of 81.7. A sample of 128 students using Method 2 produces a testing average of 72.5. Assume the standard deviation is known to be 5.87 for Method 1 and 17.66 for Method 2. Determine the 95% confidence interval for the true difference between testing averages for students using Method 1 and students using Method 2....
A researcher compares the effectiveness of two different instructional methods for teaching anatomy. A sample of...
A researcher compares the effectiveness of two different instructional methods for teaching anatomy. A sample of 178 178 students using Method 1 produces a testing average of 85.8 85.8 . A sample of 197 197 students using Method 2 produces a testing average of 73.4 73.4 . Assume that the population standard deviation for Method 1 is 5.06 5.06 , while the population standard deviation for Method 2 is 19.39 19.39 . Determine the 95% 95 % confidence interval for...
A researcher compares the effectiveness of two different instructional methods for teaching anatomy. A sample of...
A researcher compares the effectiveness of two different instructional methods for teaching anatomy. A sample of 59 students using Method 1 produces a testing average of 85.5. A sample of 31 students using Method 2 produces a testing average of 74.4. Assume that the population standard deviation for Method 1 is 19, while the population standard deviation for Method 2 is 7.55. Determine the 98% confidence interval for the true difference between testing averages for students using Method 1 and...
A researcher compares the effectiveness of two different instructional methods for teaching anatomy. A sample of...
A researcher compares the effectiveness of two different instructional methods for teaching anatomy. A sample of 218 students using Method 1 produces a testing average of 58.7. A sample of 243 students using Method 2 produces a testing average of 54.7. Assume that the population standard deviation for Method 1 is 18.63, while the population standard deviation for Method 2 is 16.17. Determine the 95% confidence interval for the true difference between testing averages for students using Method 1 and...
A researcher compares two compounds (1 and 2) used in the manufacture of car tires that...
A researcher compares two compounds (1 and 2) used in the manufacture of car tires that are designed to reduce braking distances for SUVs equipped with the tires. The mean braking distance for SUVs equipped with tires made with compound 1 is 61 feet, with a population standard deviation of 13.4. The mean braking distance for SUVs equipped with tires made with compound 2 is 67 feet, with a population standard deviation of 9.1. Suppose that a sample of 77...
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