An internet service provider (ISP) has experienced rapid growth in the past five years. As part of its marketing strategy, the company promises fast connections and dependable the capacity of its servers. One component of its evaluating is an analysis of the average amount of time a customer is connected and actively using the Internet daily. A random times, in minutes. Complete parts a through d below. 266 321 308 300 322 339 315 268 301 378 378 317 . .... O The sample size is at least 30. O The population distribution is approximately normal. O The population distribution is uniformly distributed. O The population distribution is exactly symmetrical. c. Construct and interpret the 90% confidence interval estimate for the mean daily usage time for the ISP's customers. The 90% confidence interval estimate is 299.53 minute(s) 335.97 minute (s). (Round to two decimal places as needed. Use ascending order.) Interpret the confidence interval estimate. Select the correct answer below and fill in the answer box to complete your choice. (Round to two decimal places as needed. Use ascending order.) O A. Based on the sample data, with 90% confidence, the ISP can conclude that the true population mean daily usage time is between 299.53 minute(s) and 335.97 O B. Based on the sample data, with 90% confidence, the ISP can conclude that the sample mean daily usage time is between minute(s) and minute (s). O C. Based on the sample data, the ISP can conclude that 90% of daily usage times are between minute(s) and minute(s). d. Assume that before the sample was taken, the ISP's marketing staff believed that mean daily usage time for its customers was 311 minutes. Does their assumption co interval developed in part c? because the confidence interval 311 minute(s)