Question 8 fast please Question 8 of 10 Step 1 of 2 01 08 15 A researcher compar

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Question 8

fast please

Question 8 of 10 Step 1 of 2 01 08 15 A researcher compares the effectiveness of two different instructional methods for teaching anatomy. A sample of 156 students using Method 1 produces a testing average of 64.3. Asample of 180 students using Method 2 produces a testing average of 64.7. Assume the standard deviation is known to be 7.13 for Method 1 and 6.36 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. Step 1 of 2: Find the critical value that should be used in constructing the confidence interval. Keypad Hide Answer How to Enter) 1 Point Next

Explanation / Answer

The statistical software output for this problem is:

Two sample Z confidence interval:
1 : Mean of population 1 (Std. dev. = 7.13)
2 : Mean of population 2 (Std. dev. = 6.36)
1 - 2 : Difference between two means

90% confidence interval results:

Hence,

Step - 1: 1.645

Step - 2: Lower endpoint: -1.6

Upper endpoint: 0.8

Difference n1 n2 Sample mean Std. err. L. limit U. limit 1 - 2 156 180 -0.4 0.74202262 -1.6205186 0.82051859

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