Use the following to answer the questions below:
A random sample of 48 students at a large university reported getting an average of 7 hours of sleep on weeknights, with standard deviation 1.62 hours. A dotplot of the data is provided.
‪
-Construct a 95% confidence interval for the average amount of weeknight sleep for students at this university. Round the margin of error to two decimal places.
A) 6.53 to 7.47 hours
B) 6.54 to 7.46 hours
C) 6.40 to 7.60 hours
D) 6.48 to 7.52 hours

Question

Use the following to answer the questions below:
A random sample of 48 students at a large university reported getting an average of 7 hours of sleep on weeknights, with standard deviation 1.62 hours. A dotplot of the data is provided.
‪ 
-Construct a 95% confidence interval for the average amount of weeknight sleep for students at this university. Round the margin of error to two decimal places.
A) 6.53 to 7.47 hours 
B) 6.54 to 7.46 hours 
C) 6.40 to 7.60 hours 
D) 6.48 to 7.52 hours

Quizplus · Accepted Answer

n = 48, so df = 47 and thus t* = 2.012
7 ± 2.012 11eeb2d3_8e0d_172f_b9aa_1fc1e7eb3f8f_TBW1049_00 
7 ± 0.47
6.53 to 7.47 hours

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