Question 1

A medical researcher wants to estimate the average blood pressure of adults in a city. She randomly selects 100 adults from the city and records their blood pressure. In this study, which of the following best describes the population?

Accepted Answer

All adults in the city

Question 2

A survey is conducted at a university cafeteria to determine students' favorite lunch option. Which sampling method is most likely being used?

Accepted Answer

Convenience sampling

Question 3

Which of the following is an example of a parameter?

Accepted Answer

The mean height of all students at a university

Question 4

A study claims that 'students who eat breakfast score higher on tests.' Which of the following is a potential source of bias in this study?

Accepted Answer

The study does not account for socioeconomic status

Question 5

Which of the following best describes a quantitative, continuous variable?

Accepted Answer

The weight of newborn babies measured in grams

Question 6

A researcher records the number of times each student visits the library in a month. What is the level of measurement for this data?

Accepted Answer

Ratio

Question 7

Which of the following statements about histograms is TRUE?

Accepted Answer

Histograms are used to display the distribution of quantitative data

Question 8

A frequency table shows the number of students who scored in different ranges on a math test. If 10 students scored between 80 and 89, what does this frequency represent?

Accepted Answer

The number of students whose scores are in the 80–89 range

Question 9

Which of the following is NOT a measure of center?

Accepted Answer

Range

Question 10

A distribution is described as 'skewed right.' Which of the following best describes its shape?

Accepted Answer

The tail is longer on the right side

Question 11

Given the following data set: 2, 4, 4, 6, 8. What is the mean?

Accepted Answer

$$ \frac{2+4+4+6+8}{5} = 4.8 $$

Question 12

Which measure of variation is calculated as the difference between the highest and lowest values in a data set?

Accepted Answer

Range

Question 13

A teacher wants to compare the test scores of two classes. Class A has a mean of 75 and a standard deviation of 5. Class B has a mean of 75 and a standard deviation of 15. What can be concluded?

Accepted Answer

Class B's scores are more spread out than Class A's

Question 14

A researcher wants to study the effect of a new drug. She randomly assigns patients to two groups: one receives the drug, the other receives a placebo. What type of statistical study is this?

Accepted Answer

Experimental study

Question 15

Which of the following is a problem with summary statistics that can lead to misleading conclusions?

Accepted Answer

Ignoring outliers in the data

Question 16

A company wants to know the average salary of its employees. They select every 10th employee from a list. What sampling method is this?

Accepted Answer

Systematic sampling

Question 17

Which of the following best describes the mode of a data set?

Accepted Answer

The value that occurs most frequently

Question 18

A histogram of exam scores shows most scores clustered at the high end, with a few low scores stretching the tail. Which term best describes this distribution?

Accepted Answer

Skewed left

Question 19

Which of the following is an example of qualitative data?

Accepted Answer

Eye color of students

Question 20

A frequency table for a survey shows the following: 20 students prefer pizza, 15 prefer burgers, and 10 prefer salad. What is the relative frequency of students who prefer burgers?

Accepted Answer

$$ \frac{15}{45} = 0.333 $$

Introductory Statistics Test #1 Review – Step-by-Step Study Guidance

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