Exam 12: Statistical Reasoning

Suppose a poll is taken to determine voter attitude about increasing the state income tax in exchange for increased social services (including welfare). If the poll is confined primarily to the poorer neighborhoods of the state, what results can be expected?

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 median length of service?

Suppose that the costs of operating a factory that manufactures copper pipe increase by the following amounts: copper: 6%, labor: 5%, electricity: 4%, taxes: 2%, repairs and maintenance: 3%. By how much have the costs of manufacturing the pipe increased?

In regard to the outcome of a poll, as the confidence level increases,

Suppose that the costs of operating a certain restaurant increase by the following amounts: food: 4%, labor: 5%, electricity: 3%, taxes: 2%, repairs and maintenance: 4%. By how much have the costs of operating the restaurant increased?

Suppose, to select a sample from a population of 3000 persons, the following procedure is followed. The names of the people are written on identical, square pieces of thin cardboard measuring one inch on a side, and these pieces of cardboard are then tumbled in a clothes dryer (with the heat shut off). After 30 minutes, a blindfolded person reaches in and withdraws a selected number of names. What can be said about this sample?

Suppose that two sets of data conform to a normal probability distribution, and that the standard deviation of Set X is 2, while the standard deviation of Set Y is 3. Then,

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 median age of the cars?

Suppose a poll shows Smith leading Jones by 52 percent to 48 percent for U.S. Senate. What can be said about the results of this poll?

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 -What is the variance for Data Set 2B?

Suppose that a survey is taken of the adult residents of a town, and one of the questions asked is whether the person responding graduated from high school. Can the responses to this question be trusted?

Suppose a quality control inspector pulls every tenth can of soup from a conveyor belt to ensure that the cans are filled to capacity. How should this procedure be evaluated?

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 median age of the houses?

Suppose that the average price of a piece of jewelry at Henry's Jewelers is $200, and Mr. Smith wants to spend approximately that much for his wife's birthday gift. Under what circumstances can Mr. Smith be reasonably assured of a selection of jewelry in his price range?

If the variance of a set of data is relatively large, then:

Suppose that the price of crude oil, the primary raw material for gasoline, increases by 30 percent. Assuming everything else stays the same, by how much has the cost of producing gasoline increased?

Suppose that a poll is taken about how marriage partners relate to each other, and one of the questions asked is if the person being interviewed has ever lied to his/her spouse. Can the responses to this question be trusted?

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 mean length of service of the employees?

A sample that is not representative of the population from which it is drawn is said to be:

In a normal distribution, the data represented are: