Smart phone: Among 240 cell phone owners aged 18-24 surveyed, 108 said their phone was an Android phone. Perform the following. Part: 0 / 3 (a) Find a point estimate for the proportion of cell phone owners aged 18-24 who have an Android phone. Round the answer to at least three decimal places. The point estimate for the proportion of cell phone owners aged 18 - 24 who have an Android phone is Part 1 of 3 7 Changing jobs: A sociologist sampled 228 people who work in computer-related jobs, and found that 51 of them have changed jobs in the past 6 months. Part: 0 / 2 Part 1 of 2 (a) Construct a 99.5% confidence interval for those who work in computer-related jobs who have changed jobs in the past 6 months. Round the answer to at least three decimal places. A 99.5% confidence interval for the proportion of those who work in computer-related jobs who have changed jobs in the past 6 months is Sound it out: Phonics is an instructional method in which children are taught to connect sounds with letters or groups of letters. A sample of 138 first-graders who were learning English were asked to identify as many letter sounds as possible in a period of one minute. The average number of letter sounds identified was 34.09 with a standard deviation of 23.13. Part: 0 / 2 Part 1 of 2 (a) Construct a 98% confidence interval for the mean number of letter sounds identified in one minute. Round the answers to at least two decimal places. A 98% confidence interval for the mean number of letter sounds identified in one minute is Mortgage rates: Following are interest rates (annual percentage rates) for a 30-year fixed rate mortgage from a sample of lenders in Macon, Georgia for one day. It is reasonable to assume that the population is approximately normal. 4.754 4.373 4.174 4.678 4.426 4.229 4.124 4.250 3.952 4.195 4.296 Send data to Excel Part: 0 / 2 Part 1 of 2 (a) Construct an 80% confidence interval for the mean rate. Round the answer to at least four decimal places. An 80% confidence interval for the mean rate is Internet service: An Internet service provider sampled 540 customers and found that 74 of them experienced an interruption in high-speed service during the previous month. Part: 0 / 3 Part 1 of 3 (a) Find a point estimate for the population of all customers who experienced an interruption. Round the answer to at least three decimal places. The point estimate for the population proportion of all customers who experienced an interruption is Get an education: In 2012 the General Social Survey asked 841 adults how many years of education they had. The sample mean was 7.21 years with a standard deviation of 7.82 years. Part: 0 / 2 Part 1 of 2 (a) Construct a 90% confidence interval for the mean number of years of education. Round the answers to at least two decimal places. A 90% confidence interval for the mean number of years of education is