Each child in a sample of 62low-income children was administered a language and communication exam. The sentence complexity scores had a mean of 7..63and a standard deviation of8.95

Complete parts a through d.

a.

From the? sample, estimate the true mean sentence complexity score of all? low-income children.

?

?(Type an integer or a? decimal.)

b.Form a? 90% confidence interval for the? estimate, parta.

The? 90% confidence interval is

(Round to the nearest hundredth as? needed.)

c.Give a practical interpretation of the? interval, partb.

A. We are? 90% confident that the mean sentence complexity score of all? low-income children is outside the confidence interval.

B. We are? 90% confident that the mean sentence complexity score of all? low-income children is between the endpoints of the confidence interval.

C. We are? 10% confident that the mean sentence complexity score of all? low-income children is outside the confidence interval.

D. We are? 10% confident that the mean sentence complexity score of all? low-income children is between the endpoints of the confidence interval.

E. An interpretation cannot be determined.

d. Suppose the true mean sentence complexity score of? middle-income children is known to be 15.55. Is there evidence that the true mean for? low-income children differs from? 15.55?

Yes

No

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