# Confidence Intervals

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Two sets of 100 students each were taught to read by two different methods. After instruction was over a reading test gave the following results: = 73.4, = 70.3, = 8, =10. Show that a 90 percent confidence interval for is

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Two sets of 100 students each were taught to read by two different methods. After instruction was over a reading test gave the following results: = 73.4, = 70.3, = 8, =10. Show that a 90 percent confidence interval for is

Solution. Since we use a 90% confidence level, z=1.645. Use a formula

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#### Solution Summary

The solution discusses confidence intervals for different methods. The 90 percent confidence intervals are used.

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