Frist answer a question of 7.1

Done 6 myopenmath.com AA 6 Chapter 7.2 Homework Score: 0/11 0/11 answered Progress saved Done (3) wlc. 0 Question 10 V l3 0/1 pt '0 3 8 99 G) Details The high temperatures (in degrees Fahrenheit) of a random sample of 10 small towns are: Assume high temperatures are normally distributed. Based on this data, find the 95% confidence interval of the mean high temperature of towns. Enter your answer as an open-interval (i.e., parentheses) accurate to two decimal places (because the sample data are reported accurate to one decimal place). Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. Question Help: 8 Message instructor 80/1 pt '0 3 8 99 G) Details A student was asked to find a 90% confidence interval for the proportion of students who take notes using data from a random sample of size n = 82. Which of the following is a correct interpretation of the interval 0.14 l3 0/1 pt '0 3 8 99 G) Details In a recent poll, 170 people were asked if they liked dogs, and 24% said they did. Find the margin of error of this poll, at the 95% confidence level. Give your answer to three decimals Question Help: Video 8 Message instructor Submit Question Done 6 myopenmath.com AA (3 Chapter 7.2 Homework Score: 0/11 0/11 answered Progress saved Done (3) wlc. 0 Question 6 v l3 0/1 pt '0 3 8 99 G) Details In a survey, 19 people were asked how much they spent on their child's last birthday gift. The results were roughly bell- shaped with a mean of $35 and standard deviation of $9. Find the margin of error at a 98% confidence level. Give your answer to two decimal places. Question Help: 8 Message instructor Submit Question Done 3 myopenmath.com AA G Chapter 7.1 Homework Score: 3/11 3/11 answered Progress saved Done (a) 'l/EC. 0 Question 9 v E 0/1 pt '0 3 8 99 G) Details 4 H Out of 500 people sampled, 145 preferred Candidate A. Based on this, estimate what proportion of the voting population (7r) prefers Candidate A. Use a 90% confidence level, and give your answers as decimals, to three places. l: Question Help: 8 Message instructor l3 0/1 pt '0 3 8 99 G) Details You measure 46 randomly selected textbooks' weights, and find they have a mean weight of 46 ounces. Assume the population standard deviation is 8.3 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places l3 0/1 pt '0 3 8 99 G) Details You are interested in estimating the the mean age of the citizens living in your community. In order to do this, you plan on constructing a confidence interval; however, you are not sure how many citizens should be included in the sample. If you want your sample estimate to be within 4 years of the actual mean with a confidence level of 97%, how many citizens should be included in your sample? Assume that the standard deviation of the ages of all the citizens in this community is 21 years. Sample Size: Question Help: 8 Message instructor Submit Question Done 3 myopenmath.com AA (3 Chapter 7.1 Homework Score: 3/11 3/11 answered Progress saved Done (a) WC. 0 Question 5 v l3 0/1 pt '0 3 8 99 G) Details Express the confidence interval (9.1 % , 20.9 % ) in the form of :|: ME. Question Help: Video 8 Message instructor Submit Question Done 8 myopenmath.com AA 6 Chapter 7.2 Homework Score: 0/11 0/11 answered Progress saved Done (3) wlc. 0 Question 11 V IZO/1 pt '0 3 8 99 G) Details A sample of the length in inches for newborns is given below. Assume that lengths are normally distributed. Find the 95% confidence interval of the mean length. - - - - - - - - - - IZO/1 pt '0 3 8 99 G) Details If n=28, a?(x-bar)=39, and 5:17, construct a confidence interval at a 80% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place. 1: Question Help: 8 Message instructor Submit Question Done 8 myopenmath.com AA 6 Chapter 7.1 Homework Score: 3/11 3/11 answered Progress saved Done (3) wlc. 0 Question 7 v l3 0/1 pt '0 3 8 99 G) Details You want to obtain a sample to estimate the proportion of a population that possess a particular genetic marker. Based on previous evidence, you believe approximately 19* : 12 % of the population have the genetic marker. You would like to be 90% confident that your estimate is within 2.5% of the true population proportion. How large of a sample size is required? Do not round mid-calculation. However, you may use a critical value accurate to three decimal places. Question Help: 8 Message instructor Submit Question Done 8 myopenmath.com AA 6 Chapter 7.2 Homework Score: 0/11 0/11 answered Progress saved Done (3) wlc. 0 Question 8 v l3 0/1 pt '0 3 8 99 G) Details Assume that a sample is used to estimate a population mean u . Find the 99% confidence interval for a sample of size 275 with a mean of 36.5 and a standard deviation of 10.3. Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). l3 0/1 pt '0 3 8 99 G) Details You measure 49 watermelons' weights, and find they have a mean weight of 40 ounces. Assume the population standard deviation is 8.5 ounces. Based on this, construct a 90% confidence interval for the true population mean watermelon weight. Give your answers as decimals, to two places :I: OUI'ICES Question Help: 8 Message instructor Submit Question Done 6 myopenmath.com AA 6 Chapter 7.2 Homework Score: 0/11 0/11 answered Progress saved Done (3) wlc. 0 Question 9 v B 0/1 pt '0 3 8 99 G) Details You intend to estimate a population mean ,u with the following sample. You believe the population is normally distributed. Find the 99.5% confidence interval. Enter your answer as an open- interval (i.e., parentheses) accurate to two decimal places (because the sample data are reported accurate to one decimal place). Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. Question Help: 8 Message instructor l3 0/1 pt '0 3 8 99 G) Details You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable estimate for the population proportion. You would like to be 98% confident that your estimate is within 1.5% of the true population proportion. How large of a sample size is required? Do not round mid-calculation. However, use of a critical value rounded to three decimal places will suffice. Question Help: 8 Message instructor Submit Question 10:32 Done myopenmath.com AA C Chapter 7.2 Homework Score: 0/11 0/11 answered Progress saved Done & Vo . . . Question 5