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A teacher administers a standardized math test to his class of 75 students. The mean score (out of 300 possible points) is 235. From previous studies, you know the population standard deviation is 28.

a) Using the sample data given, calculate a 95% confidence interval for the population mean.
b) Based on this confidence interval would you agree that the true population mean is under 239? Explain. x=235

User Flotothemoon
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1 Answer

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11 votes

Answer: (228.7, 241.3)

Explanation:

User PROFESSOR
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