To determine whether there is a significant difference in the weights of boys and girls beginning kindergarten, random samples of 50 boys and 50 girls aged 5 years produced the following information.
Mean Standard
Deviation
Sample
Size
Boys 43.8 lb 6.7 50
Girls 38.4 lb 3.8 50
o) What is the point estimate of the difference in the average weights for 5- year old boys and girls? (Use ,(Boys – ,,Girls.)
I I ‘b
What is the 95% margin of error for the point estimate you found? (Round your answer to three decimal places.)
I l’b
(b) What is the 98% confidence interval estimate of ,,Boys – Gjris? (Round your answers to two decimal places.)
lb to
Is there a significant difference in the average weights of 5-year old boys and girls?
can
in the confidence interval,
conclude that there
Since the value /
