Refer to Example 8 How large a sample will we need in order to assert with probability 0 95 that the sample mean will not differ from the true mean by more than 1 5 (replacing ( sigma ) by (s ) is reasonable here because the estimate is based on a sample of size eighteen ) Data From Example 8 Data From Example 7 EXAMPLE 8 Graphics to accompany a two sample t test Example 7, Chapter 2, presents strength measurements on an aluminum alloy A second alloy yielded measurements given in the following stem and leaf display Find a 95 confidence interval for the difference in mean strength 8

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Question: Refer to Example 8. How large a sample will we need in order to assert with probability 0.95 that the sample mean will not differ

Refer to Example 8. How large a sample will we need in order to assert with probability 0.95 that the sample mean will not differ from the true mean by more than 1.5. (replacing $\sigma$ by $s$ is reasonable here because the estimate is based on a sample of size eighteen.)

Data From Example 8

EXAMPLE 8 Graphics to accompany a two sample t test Example 7,

Data From Example 7

Chapter 2, presents strength measurements on an aluminum alloy. A second alloy

EXAMPLE 8 Graphics to accompany a two sample t test Example 7, Chapter 2, presents strength measurements on an aluminum alloy. A second alloy yielded measurements given in the following stem-and-leaf display. Find a 95% confidence interval for the difference in mean strength 8.

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