At age 9, the average weight (21.3 kg) and the average height (124.5 cm) for both boys and girls are exactly the same. A random sample of 9-year-olds
yielded these results.
Sample size
Mean height, cm
Population variance
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Use μ, for the average height for boys.
Part: 0/2
Boys
55
124.9
98
Part 1 of 2
Girls
55
128.1
120
Estimate the mean difference in height between boys and girls with 90% confidence. Round your intermediate calculations to two decimal places and final
answers to one decimal place.
X
3