Exam 12: Statistical Reasoning

In a poll about creating a publicly funded healthcare program, suppose the question is asked, "Should free healthcare be given to people who are too lazy to work and who have never paid any taxes?" Can the answers to this question be trusted?

The range of a set of data is:

Data Set 2B Suppose that the height (in meters) of 6 fir trees in the garden department of a store are as follows: 1, 2, 2, 4, 4, 5 -For Data Set 2B, what is the standard deviation?

Data Set 2C Suppose that the lengths of employment (in years) of 7 employees of a small company are as follows: 1, 2, 2, 3, 4, 4, 5 -For Data Set 2C, what is the approximate standard deviation?

Suppose you are the pilot of a small commercial airplane, and you want to ensure that the plane will carry the load. What statistic would be most useful to you?

Suppose that you want to buy a pair of size 9 shoes, and you are told that the average size of the shoes in Bob's Shoe Store are size 9. Under what circumstances is this information useful to you?

One way that pictograms can distort a message is by:

In general, the larger a sample is:

If the standard deviation of a set of data is relatively small, then:

Suppose that a biologist took water samples at random intervals from a rapidly flowing creek to test for contaminants. A sample was taken at a single location from the center of the creek for one year. Could such a survey be depended on?

Range, variance, and standard deviation are measurements of:

One way of exaggerating fluctuations in the price of a company's stock is to:

Suppose two simultaneous random surveys were taken of a mid sized city to determine public acceptance of a proposed ballot measure. Survey X covered 1000 voters, and Survey Y covered 2000 voters. How would you expect the surveys to compare for accuracy?

Data Set 1A Suppose that the following table represents the length of service (in years) of the employees of a business: -Given Data Set 1A, what is the modal length of service?

Data Set 2A Suppose that the ages of 8 kittens in a pet shop are as follows: 1, 2, 2, 3, 3, 4, 4, 5 -For Data Set 2A, what is the standard deviation?

Data Set 1C Suppose that the following table represents the age of the houses in a certain neighborhood: -Given Data Set 1C, what is the modal age of the houses?

Suppose a poll is taken to sample voter preferences in an upcoming presidential election. To conduct the poll, an interviewer standing on a street corner in the financial district of a large city asks questions of people as they pass by. What result would be expected from such a poll?

Data Set 1B Suppose that the following table represents the age of the cars in a small used car lot: -Given Data Set 1B, what is the mean age of the cars?

Data Set 2C Suppose that the lengths of employment (in years) of 7 employees of a small company are as follows: 1, 2, 2, 3, 4, 4, 5 -What is the approximate variance for Data Set 2C?

One of the problems with the Literary Digest poll taken prior to the 1936 presidential election was: