Question 1

Which of the following best describes the science of statistics?

Accepted Answer

The science of collecting, summarizing, organizing, and analyzing information in order to answer questions or draw conclusions.

Question 2

A survey of 385 employees at a large electronics company found that 55% were dissatisfied with their working conditions. Is the value 55% a parameter or a statistic?

Accepted Answer

Statistic

Question 3

The number of seats in a school auditorium is an example of which type of variable?

Accepted Answer

Quantitative

Question 4

The numbers on the shirts of a boy's football team are best classified as:

Accepted Answer

Qualitative

Question 5

A researcher randomly assigns 61 adults with diabetes to a treatment group and 61 to a placebo group, then compares their symptoms after three months. What type of study is this?

Accepted Answer

Experiment

Question 6

Every fifth adult entering an airport is checked for extra security screening. What sampling technique is used?

Accepted Answer

Systematic

Question 7

Given the following frequency distribution for payrolls of baseball teams, what percentage of teams had payrolls in the $30-40 million range? (Refer to the provided bar graph.)

Accepted Answer

31%

Question 8

The pie chart shows the percentage of votes received by each candidate in a student council election: Ann 24%, Ted 30%, Gina 18%, Ming 28%. Who received the fewest votes?

Accepted Answer

Gina

Question 9

Which measure of central tendency may have more than one value in a numeric data set?

Accepted Answer

Mode

Question 10

If $$X_1$$, $$X_2$$, $$X_3$$, ..., X_N$$ are the N$ observations of a variable from a population, then the population mean is symbolized by:

Accepted Answer

$$\mu$$

Question 11

A highly selective boarding school will only admit students who place at least 1.5 z-scores above the mean on a standardized test with mean 110 and standard deviation 12. What is the minimum score required for admission?

Accepted Answer

128

Question 12

A group of 79 students were asked how far they commute to work. The first quartile (Q1) is the value below which 25% of the data fall. If the frequency distribution is: 1 mi (1), 2 mi (2), 3 mi (12), 4 mi (18), 5 mi (7), 6 mi (10), 7 mi (10), 8 mi (11), 9 mi (5), 10 mi (3), what is Q1?

Accepted Answer

4 mi

Question 13

Which of the following best describes the relationship between mean, median, and mode in a distribution that is skewed to the right?

Accepted Answer

mean \u003e median \u003e mode

Question 14

A study finds that the distribution of salaries for professional basketball players is skewed to the right. Which measure of central tendency is most appropriate to describe the center of this distribution?

Accepted Answer

Median

Question 15

A sample of 25 service project scores is: 97, 96, 96, 95, 96, 99, 97, 97, 100, 99, 95, 98, 95, 96, 100, 95, 98, 96, 96, 100, 95, 97, 99, 97, 98. What is the mode of this data set?

Accepted Answer

96

Question 16

The percentage of measurements that are above the 39th percentile is:

Accepted Answer

61%

Question 17

A statistics student interviews everyone in his apartment building to determine who owns a cell phone. What sampling technique is used?

Accepted Answer

Convenience

Question 18

Which of the following is an example of a qualitative variable?

Accepted Answer

The musical instrument played by a music student

Question 19

A writer for an art magazine randomly selects and interviews fifty male and fifty female artists. What sampling technique is used?

Accepted Answer

Stratified

Question 20

The range for the data set 0.145, 0.113, 0.547, 0.413, 0.574, 0.234 is:

Accepted Answer

0.461

Step-by-Step Guidance for Practice Midterm Exam – Introductory Statistics

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