Thread: (Business Statistics) Confidence interval question.

Hi everyone, can some1 kindly help me on these questions below. Thanks in advance!

Question 1.

A random sample of 49 people revealed that they listened to the radio and average (mean) of 40 minutes per day with a standard deviation of 14 minutes. Develop a 90% and 95% confidence interval for the population mean listening time.

1.Develop a 90% confidence interval for the population mean listening time.
2.Develop a 95% confidence interval for the population mean listening time.
3.Which of the two confidence intervals is wider?

Originally Posted by botakhenry

Hi everyone, can some1 kindly help me on these questions below. Thanks in advance!

Question 1.

A random sample of 49 people revealed that they listened to the radio and average (mean) of 40 minutes per day with a standard deviation of 14 minutes. Develop a 90% and 95% confidence interval for the population mean listening time.

1.Develop a 90% confidence interval for the population mean listening time.
2.Develop a 95% confidence interval for the population mean listening time.
3.Which of the two confidence intervals is wider?

What have you tried? Where are you stuck?