Blog

4. Define vigilance decrement and explain one factor that contributes to it. 

Problem 3 (24 points): Medical tests, such as those for COVID-19, can suffer from false alarms and misses. As a human factors specialist, you have been asked to apply signal detection theory (SDT) to investigate doctors’ abilities to detect COVID-19 using chest x-rays. You have asked 2 doctors to examine 20 chest x-rays (10 who did not have COVID-19 and 10 who did have COVID-19). Use the following data sets generated from the 2 doctors, as well as Z scores and associated ordinate values given below, to answer parts (a)–(e).  State of the world (COVID-19) Doctor 1 Doctor 2 Present Not Present Present Not Present Doctor’s judgment Yes (COVID-19 present) 2 1 9 7 No (COVID-19 not present) 8 9 1 3 Total (T) 10 10 10 10  

Consider the one-sided confidence interval expressions for a mean of a normal population. What value of zα would result in a 88% CI? Round your answer to 2 decimal places.  

According to the Hick–Hyman Law, what happens to a person’s response time as the number of equally likely control alternatives increases?

The 2004 presidential election exit polls from the critical state of Ohio provided the following results. The exit polls had 2020 respondents, 768 of whom were college graduates. Of the college graduates, 412 voted for George Bush. Calculate a 80% lower confidence interval for the proportion of college graduates in Ohio who voted for George Bush. Round your answer to 4 decimal places.   lower [A], upper [B]

Please take a picture of a paper or scan a paper (any paper, can be a blank one)  Then save it in your computer and upload that here. Don’t upload an existing file. I want to check whether Honorlock let you save a file in your computer and let you upload that.

Suppose that you wanted the total width of the two-sided confidence interval on mean temperature to be 1.5 degrees Celsius at 99% confidence. σ = 0.5. What sample size should be used? Round up the answer to an integer.

The 2004 presidential election exit polls from the critical state of Ohio provided the following results. The exit polls had 2020 respondents, 768 of whom were college graduates. Of the college graduates, 412 voted for George Bush. Calculate a 85% lower confidence interval for the proportion of college graduates in Ohio who voted for George Bush. Round your answer to 4 decimal places.   lower [A], upper [B]

In a multiply redundant system the lifetime of individual elements can be modeled with a parabolic distribution. The cdf of the lifetime in years of a circuit element is modeled by the equation F(x)= −5.83×3+6.12×2   0 < x < 0.7 years. Find the probability that the circuit elements will survive for at most 0.60 years? Round your answer to 4 decimal places.     

During a recent drought, a water utility in a certain town sampled 100 residential water bills and found that 73 of the residences had reduced their water consumption over that of the previous year. With what degree of confidence (should be percentage) one can assert that the width of CI is to be at most 0.11.