Question

According to a​ study, children ranging from ages 8 to 18 averaged 7.7 hours per day...

According to a​ study, children ranging from ages 8 to 18 averaged 7.7 hours per day using electronic media. Assume the population standard deviation is 2.8 hours per day. A random sample of 30 children from this age group was​ selected, with a sample average of 8.8 hours of electronic media use per day.

Complete parts a and b below. a. Is there support for the claim of the study using the criteria that the sample average of 8.8 hours falls within the symmetrical interval that includes​ 95% of the sample means if the true population mean is 7.7 ​hours? Select the correct choice below and fill in the answer box within your choice. ​(Type an integer or decimal rounded to four decimal places as​ needed.)

Math   Statistics-And-Probability   
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Answer #1

Population avg doesn't fall into the confidence interval.

Therefore, the claim is true.

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