Exam 14: Sampling and Simulation

The survey question "Since everybody likes baseball, you support the construction of the new ball field, don't you?" is a poor survey question because it is

Which of the following is a common simulation technique?

The PAC-10 Conference consists of ten schools. Use the following random number table to select two schools at random from the conference to play the first game of the season. Presume the highlighted entry has been randomly selected as your first school, and you are working down the columns then left to right from column to column to select the next school. From the table, the first school chosen is California. What will the second school be ?

Sampling methods often use random numbers to select samples.

An example of a good technique for getting a random sample of the population would be to ask a question over the radio on a station that covers the region where the entire population lives, and have the listeners phone in with an answer.

A survey could be biased if the identity of those being surveyed is known.

In double sampling, the researcher uses a combination of sampling methods.

Which of the following methods will give a truly random sampling of the general population?

One limitation of random sampling is that if the population is extremely large, numbering and selecting sample elements could be costly and time consuming.

If a third of a population is female, then approximately a third of the representative sample should be female.

If a researcher chooses a name at random in the phone book and then chooses every 100th name thereafter as a sample, the researcher would be employing the method of systematic sampling.

In many women's tennis matches they play best-out-of-three sets. In other words, they play until one player wins two sets, and there are no ties. Lourdes and Mariana are two rivals, though Lourdes seems to win about six sets for every four that Mariana wins. Use the random numbers table below to simulate 10 matches between Lourdes and Marian. Let an entry in the table correspond to one set, 0-5 corresponds to Lourdes winning the set, and 6-9 corresponds to Mariana winning the set. Begin each match with a different highlighted number, and use it with up to two entries below it to represent a match. In how many of the ten simulated matches did Mariana win?

The PAC-10 Conference consists of ten schools. Use systematic sampling selecting every second number from the population to identify five schools out of the ten as a sample. The following random numbers table has already been used to randomly select the first school, USC. What are the other four schools in the sample?

A particular baseball player gets, on average, three hits for every ten times he comes to bat. In a typical game, he comes to bat five times. Use the random numbers table below to simulate his hitting in ten games. Let an entry in the table correspond to one time at bat, 0-2 corresponds to getting a hit, and 3-9 corresponds to not getting a hit. The highlighted numbers were selected at random, and a different one should be used to start each of the player's simulated games. That is, use a highlighted number and the four numbers below it to represent his batting in one game. In how many of the ten simulated games did he get three or more hits?

What term is given to a sample chosen at random from a population?

Which of the following is not an advantage of cluster sampling over the other sampling techniques?

Five-digit random numbers are used to simulate scores on each hole in an 18-hole round of golf. The correspondence between the random numbers and scores on each hole is chosen to be as follows. Use the following portion of a random numbers table starting with the highlighted number, and determine how many holes the simulated golfer made par or better (i.e., how many holes-in-one, eagles, birdies, and pars were obtained in the 18 holes). Use the highlighted number as the score on the first hole; work down a column moving from left to right, column to column as needed.

The time and place where a survey is conducted could influence the results.

Which of the following is not a valid advantage for studying a sample rather than an entire population?

A(n) ______________ is a sample obtained by dividing the population into subgroups according to various homogeneous characteristics and then selecting members from each subgroup for the sample.