Exam 1: Introduction

Explain why the following data may fail to yield the desired information. -To predict a local election, a pollster samples only people who are leaving an expensive restaurant.

For nominal data, we cannot set up inequalities.

If an interviewer asks the question "Do you approve of the President's big spending policy?", he is making the error of _______.

On a statistics test, five students in a large class obtained the grades $75,84,92,87,84$ . Can the following conclusion be obtained by purely descriptive methods or does it require a generalization? Explain your answer. -The most common grade is 84 .

Explain why the following data may fail to yield the desired information. -To determine students' opinions concerning the construction of a new building, an interviewer asks students, "Do you want the school to construct a new building, which will have the effect of raising tuition?"

On a statistics test, five students in a large class obtained the grades $75,84,92,87,84$ . Can the following conclusion be obtained by purely descriptive methods or does it require a generalization? Explain your answer. -The most common grade in the whole class is 84 .

Is the following nominal, ordinal, interval, or ratio data? Explain your answer. -Responses to a question concerning the evaluation of the service at a particular restaurant in which the categories are 5 (excellent) to 1 (poor)

Explain why the following may lead to useless data: -A teacher evaluation form is administered to a class of students immediately after the whole class failed a test given by the teacher.

For ratio data, we can _______, but for interval data we cannot.

The annual sales for a manufacturing company for each of the past five years were $\$ 600,000, \$ 721,000, \$ 138,000, \$ 621,000$ , $\$ 865,000$ . Which of the following conclusions can be obtained from these figures by purely descriptive methods, and which require generalizations? -With the information provided, solve the following: Sales were low in the third year because of the recession.

Explain why the following may lead to useless data: -To predict the public view of a proposed gun control law, a poll taker interviews people walking out of a local gun club.

A type of data that does not allow inequalities to have meaning is _______ data.

The annual sales for a manufacturing company for each of the past five years were $\$ 600,000, \$ 721,000, \$ 138,000, \$ 621,000$ , $\$ 865,000$ . Which of the following conclusions can be obtained from these figures by purely descriptive methods, and which require generalizations? -With the information provided, solve the following: The sales increased from the fourth to the fifth year because of increased advertising expense.

The annual sales for a manufacturing company for each of the past five years were $\$ 600,000, \$ 721,000, \$ 138,000, \$ 621,000$ , $\$ 865,000$ . Which of the following conclusions can be obtained from these figures by purely descriptive methods, and which require generalizations? -With the information provided, solve the following: The sales exceeded $\$ 800,000$ in one of the five years.

For interval data, we can _______, but for ordinal data we cannot.

On a statistics test, five students in a large class obtained the grades $75,84,92,87,84$ . Can the following conclusion be obtained by purely descriptive methods or does it require a generalization? Explain your answer. -If another five students are selected, all grades will be between 75 and 92.

Measurements of height involve which kind of data?

Is the following nominal, ordinal, interval, or ratio data? Explain your answer. -Telephone numbers

If the difficulty level of books is ranked from 1 to 10, a set of data rankings of books falls into the category of _______ data.

A type of data in which zero indicates the absence of a certain property is _______ data.