Question

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. Step 1 of 2: Find the critical value that should be used in constructing the confidence interval.

Answer #1

n1= 158, xbar=67.5 and =17.81

n2= 179, ybar= 55.2 and = 19.32

Since population standard deviation is known so we will use Z critical value.

Z critical value for 0.98 confidence level 2.33

98% confidence level is

is 98% confidence interval

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 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 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 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 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 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 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...

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 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 8.57 years. A sample
of 146 cars owned by faculty had an average age of 8.1 years.
Assume that the population standard deviation for cars owned by
students is 2.89 years, while the population standard deviation for
cars owned by faculty is 3.85 years. Determine the...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 8 minutes ago

asked 54 minutes ago

asked 59 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago