ACT Scores A survey of 1000 students nationwide showed a mean ACT score of 21.4. A survey of 500 West Virginia scores showed a mean of 21.0. If the population standard deviation in each case is 3, can we conclude the national average is greater than the West Virginia average? Use a= 0.10 and use for the nationwide mean ACT score. Part 1 of 5

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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Author:Carter
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Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 20PPS
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ACT Scores A survey of 1000 students nationwide showed a mean ACT score of
21.4. A survey of 500 West Virginia scores showed a mean of 21.0. If the population
standard deviation in each case is 3, can we conclude the national average is
greater than the West Virginia average? Use a= 0.10 and use u, for the nationwide
mean ACT score.
Part 1 of 5
d identi
ar
least two decimal
cal va
e them with
Critica e)1.28
Part: 2 / 5
Part 3 of 5
(c) Compute the test value. Always round z score values to at least two
decimal places.
z =
Transcribed Image Text:ACT Scores A survey of 1000 students nationwide showed a mean ACT score of 21.4. A survey of 500 West Virginia scores showed a mean of 21.0. If the population standard deviation in each case is 3, can we conclude the national average is greater than the West Virginia average? Use a= 0.10 and use u, for the nationwide mean ACT score. Part 1 of 5 d identi ar least two decimal cal va e them with Critica e)1.28 Part: 2 / 5 Part 3 of 5 (c) Compute the test value. Always round z score values to at least two decimal places. z =
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