Question: The average ACT score last time was 28.5. This time we believe the average will increase. We sample 49 students and find the average ACT

The average ACT score last time was 28.5. This time we believe the average will increase. We sample 49 students and find the average ACT score is 29.5. The population standard deviation is 5. What is the test-statistic?

Group of answer choices

-1.40

1.40

-.20

None of the other choices is correct

.20

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