21-25: An Internet provider contacts a random sample of 300 customers and asks how many hours per week the customers use the Internet. It found the average amount of time spent on the Internet per week to be about 7.2 hours.

21. Define the parameter of interest, using the proper notation._____________________________________________

22. Use the information from the sample to give the best estimate of the population parameter._____________________________________________

23. Describe how to use the data to select one bootstrap sample. What statistic is recorded from this sample?__________________________________________________________________________________________

24. The standard error is about 0.458. Find and interpret a 95% confidence interval for the parameter. Round the margin of error to two decimal places.__________________________________________________________________________________________

25. Percentiles of the bootstrap distribution are provided. Use the percentiles to report a 95%confidence interval for the parameter.

1% 2.5% 5% 10% 25% 50% 75% 90% 95% 97.5% 99%

6.174 6.322 6.438 6.593 6.866 7.17 7.481 7.78 7.947 8.082 8.304 __________________________________________________________________________________________