Learn by DoingHere are the directions, grading rubric, and definition of high-quality feedback for the Learn by Doing discussion board exercises. ContextA newspaper story in Knight Ridder Newspapers described an experiment in an article with the headline “Doctor Dogs Diagnose Cancer by Sniffing It Out.”In the experiment researchers trained dogs to identify people with breast or lung cancer. The dogs were trained to lay down if they detected cancer in a breath sample. After the training, dogs sniffed different breath samples of people with and without cancer. Impartial observers watched the dogs and decided when the dog identified a person as having cancer. Researchers then revealed the condition of the person who gave the breath sample and determined if the dog had correctly identified the presence of cancer.The newspaper states, “The researchers blinded both the dog handlers and the experimental observers to the identity of the breath samples.”PromptExplain what the following sentence means. “The researchers blinded both the dog handlers and the experimental observers to the identity of the breath samples.”Explain why blinding in this experiment is important.

Week 6 Activity Sampling Distribution A computer scanner can read a bar code on a package correctly 97% of the time. One company monitors the accuracy of the scanner by randomly sampling packages and verifying that each package has been correctly scanned. Random samples of size n = 25, 50, 100, and 200 have recently been taken with the following results.    Sample Size,   n  Number Correctly   Scanned    25 24   50 49   100 95   200 193 To complete this activity, use Excel to: 1. Calculate the sample proportion for each sample size.  2.Calculate the single-proportion sampling error for each sample size.  3.Calculate the probability of finding 198 correctly scanned packages, for a sample of size n=200.  4.Submit your work Excel file. Week 7 Activity  Hypothesis Testing The Lazer Company has a contract to produce a part for Boeing Corporation that must have an average diameter of 6 inches and a standard deviation of 0.10 inch. The Lazer Company has developed a process that will meet the specifications with respect to the standard deviation, but it is still trying to meet the mean specifications. A test run (considered a random sample) of parts was produced, and the company wishes to determine whether this latest process that produced the sample will produce parts meeting the requirement of an average diameter equal to 6 inches.  Use Excel to: 1.Construct the appropriate null and alternative hypotheses with correct parameters.  2.Develop the decision rule assuming that the sample size is 200 parts and the significance level is 0.01. In a Word document: 3. Recommend what the Lazer Company should conclude if the sample mean diameter for the 200 parts is 6.03 inches.