Questions from Engineering Statistics

Q: An experiment was conducted to compare the alcohol content of soy sauce

An experiment was conducted to compare the alcohol content of soy sauce on two different production lines. Production was monitored eight times a day. The data are shown here. Production line 1: 0.48...

Q: Hydrocarbon emissions from cars are known to have decreased dramatically during the

Hydrocarbon emissions from cars are known to have decreased dramatically during the 1980s. A study was conducted to compare the hydrocarbon emissions at idling speed, in parts per million (ppm), for a...

Q: A machine is supposed to mix peanuts, hazelnuts, cashews,

A machine is supposed to mix peanuts, hazelnuts, cashews, and pecans in the ratio 5:2:2:1. A can containing 500 of these mixed nuts was found to have 269 peanuts, 112 hazelnuts, 74 cashews, and 45 pec...

Q: A mathematics placement test is given to all entering freshmen at a

A mathematics placement test is given to all entering freshmen at a small college. A student who receives a grade below 35 is denied admission to the regular mathematics course and placed in a remedia...

Q: The grades in a statistics course for a particular semester were as

The grades in a statistics course for a particular semester were as follows: Test the hypothesis, at the 0.05 level of significance, that the distribution of grades is uniform.

Q: A die is tossed 180 times with the following results:

A die is tossed 180 times with the following results: Is this a balanced die? Use a 0.01 level of significance.

Q: Three marbles are selected from an urn containing 5 red marbles and

Three marbles are selected from an urn containing 5 red marbles and 3 green marbles. After the number X of red marbles is recorded, the marbles are replaced in the urn and the experiment repeated 112...

Q: A coin is thrown until a head occurs and the number X

A coin is thrown until a head occurs and the number X of tosses recorded. After repeating the experiment 256 times, we obtained the following results: Test the hypothesis, at the 0.05 level of signi...

Q: For Exercise 1.18 on page 31, test the goodness

For Exercise 1.18 on page 31, test the goodness of fit between the observed class frequencies and the corresponding expected frequencies of a normal distribution with μ = 65 and Ï&#...

Q: For Exercise 1.19 on page 31, test the goodness

For Exercise 1.19 on page 31, test the goodness of fit between the observed class frequencies and the corresponding expected frequencies of a normal distribution with μ = 1.8 and Ï&...