Each child in a sample of 65 low-income children was administered a language and communication exam. The sentence complexity scores had a mean of 7.64 and a standard deviation of 8.92. Complete parts a and b below. Click the icon to view a table of commonly used values of Zα/2- a. Use a 90% confidence interval to estimate the population mean sentence complexity score for all low-income children. Interpret the result. The 90% confidence interval is. (Round to two decimal places as needed.) Give a practical interpretation of the interval found above. OA. We are 90% confident that the mean sentence complexity score of all low-income children is outside the confidence interval. OB. We are 10% confident that the mean sentence complexity score of all low-income children is outside the confidence interval. O c. We are 10% confident that the mean sentence complexity score of all low-income children is between the endpoints of the confidence interval. O D. We are 90% confident that the mean sentence complexity score of all low-income children is between the endpoints of the confidence interval. OE. An interpretation cannot be determined. b. 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? No Yes
Each child in a sample of 65 low-income children was administered a language and communication exam. The sentence complexity scores had a mean of 7.64 and a standard deviation of 8.92. Complete parts a and b below. Click the icon to view a table of commonly used values of Zα/2- a. Use a 90% confidence interval to estimate the population mean sentence complexity score for all low-income children. Interpret the result. The 90% confidence interval is. (Round to two decimal places as needed.) Give a practical interpretation of the interval found above. OA. We are 90% confident that the mean sentence complexity score of all low-income children is outside the confidence interval. OB. We are 10% confident that the mean sentence complexity score of all low-income children is outside the confidence interval. O c. We are 10% confident that the mean sentence complexity score of all low-income children is between the endpoints of the confidence interval. O D. We are 90% confident that the mean sentence complexity score of all low-income children is between the endpoints of the confidence interval. OE. An interpretation cannot be determined. b. 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? No Yes
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Each child in a sample of 65 low-income children was administered a language and communication exam. The sentence complexity scores had a mean of 7.64 and a standard deviation of 8.92.
Complete parts a and b below.
Click the icon to view a table of commonly used values of Zx/2
a. Use a 90% confidence interval to estimate the population mean sentence complexity score for all low-income children. Interpret the result.
The 90% confidence interval is.
(Round to two decimal places as needed.)
Give a practical interpretation of the interval found above.
O A. We are 90% confident that the mean sentence complexity score of all low-income children is outside the confidence interval.
OB. We are 10% confident that the mean sentence complexity score of all low-income children is outside the confidence interval.
O c. We are 10% confident that the mean sentence complexity score of all low-income children is between the endpoints of the confidence interval.
O D. We are 90% confident that the mean sentence complexity score of all low-income children is between the endpoints of the confidence interval.
OE. An interpretation cannot be determined.
b. 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?
No
Yes
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