Author: Anonymous

The compressive strength of concrete is normally distributed with a population mean equal to 2100 psi and population standard deviation equal to 35 psi.  A random sample of eight specimens is collected. What is the probability that the sample mean is less than 2120 psi?  Express your answer to three decimal places.   You must use the online calculator,  ti84calculator.io, to answer this question.  If you don’t use the online calculator, even if you get the question correct, the score on the question will be 0. 

A dry cleaner copies a successful rival’s page layout almost exactly, swapping in his own logo and prices. Why might this leave him worse off than starting from his own reasoning?

One field on a Buyer Card (a short written profile of one specific buyer) is meant to capture the private doubts a customer has right up until the point of paying. Which field is that?

A driving instructor wants to see every ad a specific rival is currently running across Search, YouTube, and the wider display network — for free, with no account. Which tool should he use?

An electronic product contains 67 integrated circuits. The probability that any integrated circuit is defective is 0.11.  The circuits are independent. This copywritten question is part of a quiz or exam at Arizona State University. It may not be posted or reproduced in any way without the permission of Dr. L. Chattin and Arizona State.  If you wanted to determine the probability that more than two of these circuits are defective, what is the best definition of the random variable you’d use? Select the answer that best fills in the blank:  X is  _________________________________________.    You must do this problem using the online calculator, ti84calculator.io.  If you do not, you will not receive credit for this problem, even if your answer is correct.

Intravenous fluid bags are filled by an automated filling machine. Assume that the fill volumes of the bags are independent, normal random variables with a standard deviation of 0.08 fluid ounces.  This question is part of a quiz or exam given at Arizona State University, copywritten by Dr. L. Chattin.  It may not be reproduced, posted or distributed without permission of Arizona State University and L. Chattin. The standard error of the sample mean of n = 25 bags is [x][y].  The population mean fill volume should be set equal to [z] fluid ounces so that the probability that the average of these 25 bags is below 6.0 ounces is 0.001.   You must use the online calculator for this problem.  Zero credit will be earned if you do not, even if you get the correct answer:  ti84calculator.io  

A florist is trying to decide how seriously to take a rival’s ad library results. Are those running ads more like the rival’s early experiments, or something else?

The number of engine flaws found during production inspection, X, on a certain motorcycle is known to have the discrete uniform pmf: p(x) = 0, 1, 2, 3, 4, 5, 6.   This copywritten question is part of a quiz or exam at Arizona State University and may not be reproduced or posted on any site without the permission of Dr. L. Chattin. If a sample of 36 of these engines is taken and the number of flaws for each is recorded, the probability that the sample mean number of engine flaws exceeds 4 will be _______ to four decimal places.    You must do this problem using the online calculator, ti84calculator.io.  If you do not, you will not receive credit for this problem, even if your answer is correct.

An electrician writes: “Homeowners whose breaker panel just tripped for the third time this month, and who are now afraid to reset it again.” Why does this description actually pass the specificity test?

Two carpet cleaners each study a successful rival’s page. One copies its visual template exactly. The other studies the underlying decision — who it’s for, what worry it answers, and what it promises. Which approach is more likely to actually help their own business?