Question

A researcher compares the effectiveness of two different instructional methods for teaching pharmacology. A sample of 51 students using Method 1 produces a testing average of 81.6. A sample of 76 students using Method 2 produces a testing average of 76.4. Assume that the population standard deviation for Method 1 is 12.24, while the population standard deviation for Method 2 is 11.19. Determine the 90% confidence interval for the true difference between testing averages for students using Method 1 and students using Method 2. Step 1 of 3: Find the point estimate for the true difference between the population means.

Step 2 of 3: Calculate the margin of error of a confidence
interval for the difference between the two population means. Round
your answer to six decimal places.

Step 3 of 3: Construct the 90% confidence interval. Round your answers to one decimal place.

Answer #1

A researcher compares the effectiveness of two different
instructional methods for teaching anatomy. A sample of 215
students using Method 1 produces a testing average of 55.5. A
sample of 242 students using Method 2 produces a testing average of
64.2. Assume that the population standard deviation for Method 1 is
7.95, while the population standard deviation for Method 2 is
18.21. Determine the 90% 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 physiology. A sample of 54
students using Method 1 produces a testing average of 51.7. A
sample of 90 students using Method 2 produces a testing average of
56.8. Assume that the population standard deviation for Method 1 is
7.35, while the population standard deviation for Method 2 is
16.72. Determine the 80% 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 physiology. A sample of 189
students using Method 1 produces a testing average of 71.9. A
sample of 141 students using Method 2 produces a testing average of
78.3. Assume that the population standard deviation for Method 1 is
11.07, while the population standard deviation for Method 2 is
11.9. 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 79 students
using Method 1 produces a testing average of 67.2. A sample of 44
students using Method 2 produces a testing average of 58.5. Assume
that the population standard deviation for Method 1 is 11.27, while
the population standard deviation for Method 2 is 17.38. Determine
the 95% 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 206206 students using Method
1 produces a testing average of 82.9. A sample of
244 students using Method 2 produces a testing average of
62.2. Assume that the population standard
deviation for Method 1 is 10.23, while the population standard
deviation for Method 2 is 11.35. Determine the 95% 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 79 students
using Method 1 produces a testing average of 67.2. A sample of 44
students using Method 2 produces a testing average of 58.5. Assume
that the population standard deviation for Method 1 is 11.27, while
the population standard deviation for Method 2 is 17.38. Determine
the 95% 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 physiology. A sample of 202
students using Method 1 produces a testing average of 78.1. A
sample of 194 students using Method 2 produces a testing average of
56.4. Assume that the population standard deviation for Method 1 is
9.22, while the population standard deviation for Method 2 is 6.91.
Determine the 99%confidence interval for the true difference
between testing averages for students using Method 1 and students...

A researcher compares the effectiveness of two different
instructional methods for teaching anatomy. A sample of 116
students using Method 1 produces a testing average of 50.3. A
sample of 151 students using Method 2 produces a testing average of
68.6. Assume that the population standard deviation for Method 1 is
15.62, while the population standard deviation for Method 2 is
17.21. Determine the 99% 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 158
students using Method 1 produces a testing average of 67.5. A
sample of 179 students using Method 2 produces a testing average of
55.2. Assume the standard deviation is known to be 17.81 for Method
1 and 19.32 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....

An investigator compares the durability of two different
compounds used in the manufacture of a certain automobile brake
lining. A sample of 121 brakes using Compound 1
yields an average brake life of 39,122 miles.
A sample of 163 brakes using Compound 2 yields an
average brake life of 48,271 miles. Assume that
the population standard deviation for Compound 1 is 3175
miles, while the population standard deviation for
Compound 2 is 1335 miles. Determine the 98%
confidence interval for...

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