At age 9, the average weight is 21.3 kg and the average height is 124.5 cm for both boys and girls, which are exactly the same. A random sample of 9-year-olds yielded these results.
Boys
Girls
Sample size
60
60
Mean height, cm
123.2
125.8
Population variance
98
120
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Use μ1 for the average height for boys
A) 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.
B) Since the confidence interval does not contain zero, the null hypothesis is rejected and there is a difference in the average height for boys and girls. YES OR NO