Structural engineers use wireless sensor networks to monitor the condition of dams and bridges. The article “Statistical Analysis of Vibration Modes of a Suspension Bridge Using Spatially Dense Wireless Sensor Network" (S. Pakzad and G. Fenves, Journal of Structural Engineering, 2009:863-872) describes an experiment in which accelerometers were placed on the Golden Gate Bridge for the purpose of estimating vibration modes. The following output (from MINITAB) describes the fit of a linear model that predicts the frequency (in Hz) in terms of the damping ratio for overdamped (damping ratio > 1) modes. There are n = 7 observations. The regression equation is Frequency = 0.773 - 0.280 Damping Ratio Predictor Coef SE Coef Constant 0.77289 0.14534 5.31760.003 Damping -0.279850.079258 -3.53090.017 Ratio How many degrees of freedom are there for the Student's t statistics? Find a 98% confidence interval for ß1. a. b. Find a 98% confidence interval for Bo- C. d. Someone claims that the frequency decreases by 0.6 Hz if the damping ratio increases by 1. Use the given output to perform a hypothesis test to determine whether this claim is plausible.

The decline of salmon fisheries along the Columbia River in Oregon has caused great concern among commercial and recreational fishermen. The paper 'Feeding of Predaceous Fishes on Out-Migrating Juvenile Salmonids in John Day Reservoir, Columbia River' (Trans. Amer. Fisheries Soc. (1991: 405-420) gave the accompanying data on y = maximum size of salmonids consumed by a northern squaw fish (the most abundant salmonid predator) and x = squawfish length, both in mm. Here is the computer software printout of the summary: Coefficients:                         Estimate     Std. Error     t value     Pr(> |t|)   (Intercept)   −89.010     16.703     −5.329     0.000   Length   0.705     0.046     15.293     0.000   Using this information, give the equation of the least squares regression line.

NW 6.12 CORPORATE SUSTAINABILITY OF CPA FIRMS. Corporate sustainability refers to business practices designed CORSUS around social and environmental considerations. Refer to the Business and Society (March 2011) study on the sustainability behaviors of CPA corporations, Exercise 2.23 (p. 59). Recall that the level of support for corporate sustainability (measured on a quantitative scale ranging from 0 to 160 points) was obtained for each in a sample of 992 senior managers at CPA firms. Higher point values indicate a higher level of support for sustainability. The accompanying StatCrunch printout gives a 99% confidence interval for the mean level of support for all senior managers at CPA firms. One sample T confidence interval: μ: Mean of variable 99% confidence interval results: Variable Sample Mean Std. Err. DF L. Limit U. Limit Support 67.75504 0.85314633 991 65.553241 69.95684 a. Locate the 99% confidence interval on the printout. b. Use the sample mean and standard deviation on the…

The authors of the paper "Statistical Methods for Assessing Agreement Between Two Methods of Clinical Measurement"† compared two different instruments for measuring a person's ability to breathe out air. (This measurement is helpful in diagnosing various lung disorders.) The two instruments considered were a Wright peak flow meter and a mini-Wright peak flow meter. Seventeen people participated in the study, and for each person air flow was measured once using the Wright meter and once using the mini-Wright meter.   Subject Mini-WrightMeter WrightMeter Subject Mini-WrightMeter WrightMeter 1 512 494 10 445 433 2 430 395 11 432 417 3 520 516 12 626 656 4 428 434 13 260 267 5 500 476 14 477 478 6 600 557 15 259 178 7 364 413 16 350 423 8 380 442 17 451 427 9 658 650         (a) Suppose that the Wright meter is considered to provide a better measure of air flow, but the mini-Wright meter is easier to transport and to use. If the two types of meters produce…

If you had four factors, were interested in main effects and two-way interactions and wanted to conduct a three-level Central Composite Design, the total experimental runs would be the coded axial value would be ? and