A national standard requires that public bridges over 20 feet in length must be inspected and rated every 2 years. The rating scale ranges from 0 (poorest rating) to 9 (highest rating). A group of engineers used a probabalistic model to forecast the inspection ratings of all major bridges in a city. For the year 2020, the engineers forecast that 10% of all major bridges in that city will have ratings of 4 or below. Complete parts a and b, showing work. A. Use the forecast to find the probability that in a random sample of 11 major bridges in […]

The owner of a farmer’s market was interested in determining how many oranges a person buys when they buy oranges. He asked the cashiers over a weekend to count how many oranges a person bought when they bought oranges and record this number for analysis at a later time. The data is given below in the table. The random variable x represents the number of oranges purchased and P(x) represents the probability that a customer will buy x oranges. Determine the variance of the number of oranges purchased by a customer. x 1 2 3 4 5 6 7 8 […]

One-way ANOVA: Heart Rate versus Method Analysis of Variance Source  DF  Adj SS  Adj MS  F-Value  P-Value Method   3   19805  6601.7    22.12    0.000 Error   36   10744   298.5 Total   39   30550 Assuming the conditions for a valid 1-way ANOVA are met, interpret the p-value of this test. Given the results of this test, what is the next step in the 1-way ANOVA testing process? Further output for the 1-way ANOVA is shown below.  What conclusion(s) do you draw from this output? Tukey Pairwise Comparisons Grouping Information Using the Tukey Method and 95% Confidence Method                N    Mean  Grouping Treadmill            10  178.00  A […]

You’re told that among all 18 sections of BUQU 1230 the average score on the first midterm is 66 and the standard deviation is 15. Answer the following questions: 1.      If you took 400 samples, with 20 BUQU 1230 students in each sample, and found the average of each 20-student sample – what would the standard deviation of this sampling distribution be called? Calculate the value for the standard deviation of the sampling distribution. (2 points) 2.     Referring to the 400 samples that you’ve taken (with 20 students in each sample), between what two values would you expect to find the middle 50% of […]

Listed below are systolic blood pressure measurements​ (in mm​ Hg) obtained from the same woman. Find the regression​ equation, letting the right arm blood pressure be the predictor​ (x) variable. Find the best predicted systolic blood pressure in the left arm given that the systolic blood pressure in the right arm is