Define negative feedback. Describe one example of negative feedback the assigned body system lessons. NOTE: Your responses should be your work, not a cut and paste, and not generated from AI.

Please note that this question consists of three parts. You may use MINITAB to find a final answer. However you MUST show all the mathematical work to get to the final answer. Just giving the answer without adequate work/explanation may result in zero for the question.  A local manufacturing company produces light bulbs. The lifespan of their light bulbs is normally distributed with mean 1160 hours and standard deviation 105 hours.  What is the probability that the lifespan of a randomly selected light bulb manufactured by the company will be over 1200 hours? What value divides the longest 1% lifespans from the rest 99% of lifespans?  A quality control team randomly selects a sample of 40 light bulbs and measures their lifespans. What is the probability that the average lifespan of 40 light bulbs will be over 1200 hours?

Here are tables you may need for this exam. (Click on the file name, not the downarrow to open the table within the spacer) Z_T_CHITables.pdf

In a manufacturing process, the time for a particular drilling step is normally distributed with mean 55 seconds and standard deviation 12 seconds. What percentage of times are  less than 43 seconds? [fill1]  between 31 and 67 seconds? [fill2]

The p value for testing

Let the p value for testing   Vs.    be 0.018. Then for the same data the p value for   Vs.    is 

For each statement about hypothesis testing for the population mean, state if it is true or false. 

A company wants to study the proportion of job satisfaction among their employees. How many employees should be sampled if the company wants to be 99% confident with a margin of error no more than 4%? 

95% confidence interval for true proportion of drivers who pass the driver’s license test in their first attempt in a certain target population is (0.806, 0.872) based on a random sample of size 1000. What is the point estimate of the true proportion of drivers who pass the driver’s license test in their first attempt? [fill1] What is the correct interpretation of this interval? [fill2]

A real estate agent in a particular city randomly selects 20 townhouses. For this sample the mean and standard deviation of prices are $300,000 and $60,000. The agent believes that the townhouse prices are normally distributed. What is the 95% confidence interval for the true mean townhouse price in this city?