7. Researchers investigating characteristics of gifted children collected data from schools in a large city on a random sample of thirty-six children who were identified as gifted children soon after they reached the age of four. The following histogram shows the distribution of the ages (in months) at which these children first counted to 10 successfully. Also provided are some sample statistics. Calculate a 90% confidence interval for the average age at which gifted children first count to 10 successfully. Choose the closest answer. 7 6- 5- 4 3 2 0 LL 20 25 30 35 40 Age when the child first counted to 10 successfully (in months) (29.50, 31.88) (30.49, 30.89) (29.28, 32.10) (30.12, 31.26) n min mean sd max 36 21 30.69 4.31 39

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