Astronauts increased in height by an average of approximately 40 mm (about an in

Question

Astronauts increased in height by an average of approximately 40 mm (about an inch and a half) during the Apollo--Soyuz missions, due to the absence of gravity compressing their spines during their time in space. Does something similar happen here on Earth? An experiment supported by NASA measured the heights of six men immediately before going to bed, and then again after three days of bed rest (Styf et al et al . 1997). Suppose in the study the six men increased in height by an average of 14.63 mm, the standard deviation of the increases being 0.7 mm. Find the 95% confidence interval for the change in height after three days of bed rest, giving answers to three decimal places.

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Explanation / Answer

The statistical software output for this problem is:

One sample T summary confidence interval:
: Mean of population

95% confidence interval results:

Hence,

95% confidence interval will be:

(13.895, 15.365)

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