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 service. To achieve its objectives, the company constantly evaluates 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 sample of 12 customer records shows the following daily usage times, in minutes. Complete parts a through d below. 265 310 294 304 310 347 317 288 303 383 353 337 The sample size is at least 30. O The population distribution is exactly symmetrical. O The population distribution is approximately normal. 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 300.83 minute(s) 334.33 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 sample mean daily usage time is between minute(s) and minute(s). O B. Based on the sample data, the ISP can conclude that 90% of daily usage times are between minute(s) and minute(s). O C. Based on the sample data, with 90% confidence, the ISP can conclude that the true population mean daily usage time is between minute(s) and minutels)
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 service. To achieve its objectives, the company constantly evaluates 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 sample of 12 customer records shows the following daily usage times, in minutes. Complete parts a through d below. 265 310 294 304 310 347 317 288 303 383 353 337 The sample size is at least 30. O The population distribution is exactly symmetrical. O The population distribution is approximately normal. 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 300.83 minute(s) 334.33 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 sample mean daily usage time is between minute(s) and minute(s). O B. Based on the sample data, the ISP can conclude that 90% of daily usage times are between minute(s) and minute(s). O C. Based on the sample data, with 90% confidence, the ISP can conclude that the true population mean daily usage time is between minute(s) and minutels)
Chapter6: Systems Of Equations And Inequalities
Section: Chapter Questions
Problem 17PS: Cholesterol Cholesterol in human blood is necessary, but too much can lead to health problems. There...
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I answered part a. & b. already. Part a. was:
a. Using the sample data, compute the best point estimate of the population mean for daily usage times for the ISP's customers. 317.58 minute(s)
Please answer the second part of part c. (see image) I exhausted my trys and the system gave me the correct answer of 300.83, 334.33. Please answer the second part of part c. (is it A., B. or C.?) & part d below.
d. Assume that before the sample was taken, the ISP's marketing staff believed that mean daily usage time for its customers was 327 minutes. Does their assumption concerning mean daily usage seem reasonable based on the confidence interval developed in part c?
Transcribed Image Text: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 service. To achieve its objectives, the company constantly evaluates 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 sample of 12 customer records shows the following daily usage times,
in minutes. Complete parts a through d below.
265
310
294
304
310
347
317
288
303
383
353
337
The sample size is at least 30.
The population distribution is exactly symmetrical.
The population distribution is approximately normal.
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 300.83 minute(s)-
334.33 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 sample mean daily usage time is between
minute(s) and
minute(s).
O B. Based on the sample data, the ISP can conclude that 90% of daily usage times are between
minute(s) and
minute(s).
O C. Based on the sample data, with 90% confidence, the ISP can conclude that the true population mean daily usage time is between
minute(s) and
minute(s)
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