One hundred teachers attended a seminar on mathematical problem solving. The attitudes of representative sample of 12 of the eachers were measured before and after the seminar. A positive number for change in attitude indicates that a teacher's attitude oward math became more positive. The twelve change scores are as follows. 3; 8; -1; 1; 0; 4; -3; 2; -1; 5; 4; -2 O Part (a) What is the mean change score? (Round your answer to two decimal places.) O Part (b) What is the standard deviation for this sample? (Round your answer to two decimal places.) O Part (c) What is the median change score? (Round your answer to one decimal place.) O Part (d) Find the change score that is 2.2 standard deviations below the mean. (Round your answer to one decimal place.)

One hundred teachers attended a seminar on mathematical problem solving. The attitudes of representative sample of 12 of the eachers were measured before and after the seminar. A positive number for change in attitude indicates that a teacher's attitude oward math became more positive. The twelve change scores are as follows. 3; 8; -1; 1; 0; 4; -3; 2; -1; 5; 4; -2 O Part (a) What is the mean change score? (Round your answer to two decimal places.) O Part (b) What is the standard deviation for this sample? (Round your answer to two decimal places.) O Part (c) What is the median change score? (Round your answer to one decimal place.) O Part (d) Find the change score that is 2.2 standard deviations below the mean. (Round your answer to one decimal place.)

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015

1st Edition

ISBN:9781680331141

Author:HOUGHTON MIFFLIN HARCOURT

Publisher:HOUGHTON MIFFLIN HARCOURT

Chapter11: Data Analysis And Displays

Section11.1: Measures Of Center And Variation

Problem 31E

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