15. Suppose that measurements are to be taken under a treatment condition and another n measurements are to be taken independently under a control condi- tion. It is thought that the standard deviation of a single observation is about 10 under both conditions. How large should n be so that a 95% confidence inter- val for 14x-μ Y has a width of 2? Use the normal distribution rather than the t distribution, since n will turn out to be rather large.

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15. Suppose that
measurements are to be taken under a treatment condition and
another n measurements are to be taken independently under a control condi-
tion. It is thought that the standard deviation of a single observation is about 10
under both conditions. How large should n be so that a 95% confidence inter-
val for 14x-μ Y has a width of 2? Use the normal distribution rather than the t
distribution, since n will turn out to be rather large.
Transcribed Image Text:15. Suppose that measurements are to be taken under a treatment condition and another n measurements are to be taken independently under a control condi- tion. It is thought that the standard deviation of a single observation is about 10 under both conditions. How large should n be so that a 95% confidence inter- val for 14x-μ Y has a width of 2? Use the normal distribution rather than the t distribution, since n will turn out to be rather large.
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