Chapter 11.4, Problem 11.42E

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. 273 343 314 315 310 328 304 289 284 384 378 312 a. Using the sample data, compute the best point estimate of the population mean for daily usage times for the ISP's customers. O minute(s) (Round to two decimal places as needed.)

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.a. Using the sample​ data, compute the best point estimate of the population mean for daily usage times for the​ ISP's customers.318 ​minute(s)​(Round to two decimal places as​ needed.)b. The managers of the​ ISP's marketing department would like to develop a ​% confidence interval estimate for the population mean daily customer usage time. Because the population standard deviation of daily customer usage time is unknown and the sample size is​ small,…

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   a. Using the sample​ data, compute the best point estimate of the population mean for daily usage times for the​ ISP's customers.          ______​minute(s)  ​(Round to two decimal places as​ needed.) b. The managers of the ISP’s marketing department would like to develop a 99% confidence interval estimate for the population mean daily customer…

The sales manager of a large automotive parts distributor wants to estimate the total annual sales for each of the company’s regions.  Three factors appear to be related to regional sales: the number of retail outlets in the region, the total personal income of the region, and the number of cars registered in the region. The following table shows the data for 10 regions that were gathered for last year sales.    The excel data file for this problem is:final exam question 6B spring 2021.xlsx     Region Annual sales  ($ million) Number of retail outlets Number of automobiles registered (million) Personal income ($ billion) 1 37.702 1,739 9.27 85.4 2 24.196 1,221 5.86 60.7 3 32.055 1,846 8.81 68.1 4 3.611 120 4.81 20.1 5 17.625 1,096 10.31 33.8 6 45.919 2,290 11.62 95.1 7 29.600 1,687 8.96 69.3 8 8.114 241 6.28 16.5 9 20.116 649 7.77 34.9 10 12.994 1,427 10.92…

For this year’s most important new toy, Holiday’s marketing director is expecting demand to average 40 units per retail outlet. Prior to making the final production decision based on this estimate, Holiday decided to survey a sample of 25 retailers in order to develop more information about the demand for the new product. Each retailer was provided with information about the features of the new toy along with the cost and the suggested selling price. Then each retailer was asked to specify an anticipated order quantity. Alpha = .05.  Note: Calculate for the Sample Standard Deviation.

An outbreak of the deadly Ebola virus in 2002 and 2003 killed 91 of the 95 gorillas in 7 home ranges in the Congo. To study the spread of the virus, measure " distance" by the number of home ranges separating a group of gorillas from the first group infected. Here are data on distance and number of days until deaths began in each later group:   Distance   xx   2 5 4 4 4 6 Days   yy   4 21 29 40 47 49 Use a calculator or software to find the following values. (a) Find the mean and standard deviation of   xx. MEAN:   STANDARD DEVIATION:    (b) Find the mean and standard deviation of   yy. MEAN:   STANDARD DEVIATION:    (c) Find the correlation rr between xx and yy. r:

According to a census company, 7.1% of all babies born are of low birth weight. An obstetrician wanted to know whether mothers between the ages of 35 and 39 years give birth to a higher percentage of low-birth-weight babies. She randomly selected 240 births for which the mother was 35 to 39 years old and found 26 low-birth-weight babies. Complete parts (a) through (c) below. Họ: 0.071 Hy: 0.071 Use technology to compute the P-value for this test. Use the Tech Help button for further assistance. P-value = (Round to three decimal places as needed.) State a conclusion for this test in the context of the obstetrician's question. Choose the correct answer below. O A. Do not reject the null hypothesis. There is sufficient evidence to conclude that mothers between the ages of 35 and 39 years give birth to a higher percentage of low-birth-weight babies at the a = 0.05 level of significance. B. Reject the null hypothesis. There is sufficient evidence to conclude that mothers between the ages of…