Blog

There is a shuttle stop at McCarran airport in Las Vegas where a shuttle picks up people from the airport and takes them to their hotel on the Strip.  This shuttle can hold 11 people and their luggage.  An analyst has recently used a Chi-Square Goodness of Fit test and determined that the number of people that arrive to this shuttle in a 1-hour (60 minutes) period is a Poisson random variable with a mean of 20 people.  The expected time between two consecutive arrivals is ______ minutes.  This question is part of a quiz or exam at Arizona State University.  No portion may not be posted to any website, photos and screenshots may not be taken, and no portion of it may be printed out.  

An engineer has collected processing times for a certain part as follows:  4 min, 3 min, 2 min, 4 min, 3 min, 14 min.  This question is part of a quiz or exam at Arizona State University.  No portion may not be posted to any website, photos and screenshots may not be taken, and no portion of it may be printed out. The table for a normal probability plot would be:   j xj (j-0.5)/n zj 1 A F K 2 B G L 3 C H M 4 D I N 5 E J O 6 P Q R To  3 decimal places, K = _____ Do any intermediate computations to 4 decimal places.

Question 4 – Write a VBA macro in the box provided that prompts the user to enter an integer between 1 and 10 using the message: “I am thinking of a number between 1 and 10, what is it?” The macro should then randomly generate an integer between 1 and 10 and compare it to the user’s guess. If the user guesses correctly, display: “Nailed It!” If the user guesses incorrectly, display: “Not Quite.” If the user enters anything other than an integer between 1 and 10, display: “Please enter only whole numbers between 1 and 10.”   HINT: You will need to use InputBox for the user’s guess, and its data type is String, not Integer. Once you get the user’s input, convert it to an Integer. In total, you should have three variables: one String and two Integers. [30pts]

Suppose you took a sample of 36 Honey Crisp apples and weighed each of them.  The lightest one weighed 140 grams and the heaviest one weighed 194 grams.  If you wanted to create a histogram according to the text and lectures,  each bin/interval  would be ____________ grams wide.

The manager of a fleet of automobiles is testing two brands of radial tires and assigns one tire of each brand at random to the two rear wheels of eight cars and runs the cars until the tires wear out. The data (in kilometers) follow. Analysts wish to determine if the mean difference in wear out time is zero or not.  Set up the appropriate hypothesis test.  How many degrees of freedom will there be?  

Which of the following is not a bar chart?

The following data are the joint temperatures of the O-rings (°F) for each test firing or actual launch of the Space Shuttle rocket motor (from Presidential Commission on the Space Shuttle Challenger Accident, Vol. 1, pp. 129–131): 84, 49, 61, 40, 83, 67, 45, 66, 70, 69, 80, 58, 68, 60, 67, 72, 73, 70, 57, 63, 70, 78, 52, 67, 53, 67, 75, 61, 70, 81, 76, 79, 75, 76, 58, 31. . If you determined the sample standard deviation for this data, what would the units be?

An engineer believes that the number of defects on a product he is working on has the Poisson pmf.  He collects a sample of 25 and notes the number of defects on each product.  The sorted data are 0, 0, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4.  Perform a Chi-Square Goodness of Fit test on these data.  Take all intermediate computations to four decimal places.  Under the null hypothesis, what is the expected number of products out of the 25 sampled that would have 3 defects?  Answer to two decimal places. 

Match the four V’s of big data to what best describes them.

When the expected inflation rate increases, the real cost of borrowing  [blank] and bond supply  [blank], everything else held constant.