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Author Question: A random sample of 25 third graders scored an average of 3.2 on a standardized reading test. The ... (Read 160 times)

schs14

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on: Jul 24, 2018
A random sample of 25 third graders scored an average of 3.2 on a standardized reading test. The standard deviation was 0.95 . Calculate a 99 confidence interval for the mean score on this test.
 a. (3.01, 3.39)
  b. (2.49, 3.91)
  c. (2.81, 3.59)
  d. None of the above

Question 2

Midterm Exam Results reported as z-scores.Greg is in another section of the course. The distribution of midterm scores for his section was reported as being approximately normal with a mean of 62 and a standard deviation of 8 . Greg's standardized score is +1 . What is Greg's midterm score?

Question 3

A randomly selected sample of n =51 men in Brazil had an average lifespan of 59 years. The standard deviation was 10 years. Calculate a 98 confidence interval for the average lifespan for all men in Brazil.
 a. (55.6, 62.4)
  b. (56.2, 61.8)
  c. (35.0, 83.0)
  d. None of the above


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katieost

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Reply #1 on: Jul 24, 2018
Answer to Question 1

D

Answer to Question 2

Z = +1 implies Greg's score is 1 standard deviation above the mean = 62 + 1(8) = 70 points

Answer to Question 3

A


schs14

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Reply #2 on: Jul 24, 2018
TY


katieost

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Reply #3 on: Jul 24, 2018
You're welcome


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