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 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...

A student researcher compares the ages of cars owned
by students and cars owned by faculty at a local State College. A
sample of 98 cars owned by students had an average age of 8.39
years. A sample of 80 cars owned by faculty had an average age of
5.03 years. Assume that the population standard deviation for cars
owned by students is 2.93 years, while the population standard
deviation for cars owned by faculty is 3.42 years. Determine the...

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