The cost per gallon of gas was sampled at four locations:  $3.69, $3.79, $3.59, $3.09.  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. To two decimal places, the standard deviation of this sample is $________.   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

The time it takes until the arrival of a bus to a bus stop in minutes has the following CDF:        F(x) = 1 –  e-[l]x  for x > 0 minutes This copywritten question is part of a quiz or exam at Arizona State University. It may not be reproduced or posted without the permission of Dr. Linda Chattin. The expected value of the time until the arrival of a bus is _______ minutes. Express your answer 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.

A rollerskate bearing is supposed to have an inside diameter of 2.23 mm. A random sample of 15 bearings yields and average diameter of 2.2224 mm.  The variance of this sample is 0.004 mm2.  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 upper bound of a 2-sided 99% confidence interval on the population mean bearing diameter is ___________ mm.  Enter your answer to three decimal places.    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 tax preparer knows a specific hesitation keeps some prospective clients from booking: they worry an automated tool would miss a deduction only a person would catch. She never mentions this anywhere on her own website, assuming she can just explain it if someone calls to ask. What’s the risk in leaving it unaddressed on the page itself?

An appliance repair technician gets “not enough data” when he checks a small local rival’s traffic. What should he actually do next?

Suppose that the time a customer spends waiting in line at Safeway market, X,  (in minutes) is an exponential random variable with f(x) = 0.10e-0.10x for x > 0.   Recall from formulas taught earlier in this course that the population mean of X for this pdf is 10 minutes and the population standard deviation of X for this pdf is also 10 minutes. Accept these values as fact even if you disagree. 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.  A sample of n = 49 waiting times is collected.  Determine the probability that the sample mean waiting time is less than 8 minutes.  Express your answer to 4 decimal places.   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 computer scientist is going to use hypothesis testing to determine if his sorting program, FastSort, is faster than another sorting program, NormSort.  Four data sets are sorted using both programs and the time to sort is recorded.  Results are: Data Set NormSort (sec) FastSort (sec) A 2.45 2.40 B 3.21 3.17 C 1.11 1.07 D 4.29 4.20   If you did a hypothesis test on this data, what would be the p-value?  Enter your answer to four decimal places.     You must use the online calculator,  ti84calculator.io, in this question.  If you get it right and have not used the online calculator, your score on the question will be 0.  

The cost per gallon of gas was sampled at four locations:  $2.69, $2.79, $2.59, $2.99.  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 upper bound of a 2-sided 95% confidence interval on the population mean cost is $________per gallon.  Enter your answer to two decimal places.     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 calligrapher wants her AI assistant to add a new workshop-signup page to her live website. Which piece does it need to do that?

A house painter wants to test whether his own buyer description is sharp enough. Should he judge it himself, or hand it to someone else?