Question 3 1 pts A manufacturer of high-resolution video terminals must control the tension on the mesh of fine wires that lies behind the surface of the viewing screen. Some variation is inherent in the production process. Here are the readings from an SRS of 20 wires: 269.5 297.0 269.6 283.3 304.8 280.4 233.5 257.4 317.5 374.6 327.4 264.7 307.7 310.0 343.3 328.1 342.6 338.8 340.1 336.1 The summary statistics are shown below: c = 306.32 x = 36.2093 n = 20 Which of the following correctly shows the 90% confidence interval for the mean tension of all the screens produced on this day. 306.32 + 1.73 36.2093 V20 306.32 + 1.72 36.2093 20 306.32 + 1.72 36.2093 20 306.32 + 1.73 36.2093 20Question 4 1 pts Assume that a computer was used to generate the given confidence interval for the population mean. (145, 157) Find the sample mean: O 145 151 O 157 O 160Question 5 1 pts Between 1998 and 1999 the University of Washington conducted a study that included the collection of a large amount of data on the water temperature of streams in the Pacic Northwest. The study found that the mean stream temperature for a random sample of 178 streams that were under a closed canopy of vegetation was 16.02C with a sample standard deviation of 283C. The sample data were approximately normally distributed. If you construct a condence interval for the mean stream temperature based on the t-distribution, then, in practice, what conditions must be satised? 0 The sample must be an SR5 and the population approximately normal. 0 The population must be approximately normal 0 The sample must be an SRS, but because n is large (178), the population does not have to be normal. 0 The sample doesn't need to be an SRS because n is large (178) and the population is approximately normal. Question 6 1 pts Between 1998 and 1999 the University of Washington conducted a study that included the collection of a large amount of data on the water temperature of streams in the Pacic Northwest. The study found that the mean stream temperature for a random sample of 178 streams that were under a closed canopy of vegetation was 16.02C with a sample standard deviation of 283C. Which of the following represents a 95% condence interval for the true mean stream temperature for streams under a closed canopy of vegetation? O (13.9751,17.5439) O (14.1047,16.8971) O (15.1872,16.7851) 0 (15.6014, 16.4386) Question 7 1 pts Between 1998 and 1999 the University of Washington conducted a study that included the collection of a large amount of data on the water temperature of streams in the Pacic Northwest. The study found that the mean stream temperature for a random sample of 178 streams that were under a closed canopy of vegetation was 16.02C with a sample standard deviation of 283C. Data collected during the 1950's suggested that the true mean stream temperature in this area under a closed canopy of vegetation is 155C. Does the 95% condence interval for the mean stream temperature in the 1998-1999 study provide evidence that the stream temperature for these streams has increased since the 1950's? 0 Yes, the sample mean stream temperature is 16.02C. O No, 16.02C is in the interval indicating that the mean stream temperature has not increased. 0 Yes, all of the values in the interval are above 15.5 C indicating the mean stream temperature has increased. 0 No, the mean stream temperature in the 1998-1999 study does not seem all that different from the mean stream temperature in 1950