Deck 13: Basic Statistical Concepts and Tests

Question 1

In statistical analyses, ________________ refers to a specific group of individuals who are the primary focus of interest.

A) Community
B) Population
C) Group of interest
D) Epidemiological sample

Answer 1

B

Question 2

Any characteristic, material, or attribute of someone or something that can be measured with or without an instrument or device is known as a:

A) Focus
B) Sample
C) Variable
D) Population

Answer 2

C

Question 3

This type of variable can only be assigned one of two possible values, such as yes or no.

A) Binary
B) Discrete
C) Continuous
D) Categorical

Answer 3

A

Question 4

In statistics, _______________ means the number of times an event, observation, or data value occurs in a data set.

A) Frequency
B) Occurrence
C) Percentile
D) Mean

Question 5

This is a statistical measure of the spread of the values of a quantitative variable around the mean.

A) Dispersion
B) Range
C) Standard deviation
D) Median

Question 6

This type of distribution is a symmetrical bell-shaped curve that represents the distribution of a quantitative variable.

A) Symmetrical
B) Regular
C) Even
D) Normal

Question 7

The __________________ is the interval between two numeric values within which the true value of a variable is expected to lie with a high level of probability.

A) Probability interval
B) Confidence interval
C) Chance interval
D) Estimation interval

Question 8

Which of the following is an example of systematic sampling?

A) Selecting people from different cities in Texas
B) Selecting a group of hospitals and then obtaining a random sample in each hospital
C) Selecting every 10^th person who comes into a hospital after 3pm
D) Selecting four groups of people from a shopping center and taking a random sample from each

Question 9

Which P value indicates that there is a less than 10% chance of the observation occurring by chance?

A) < 0.01
B) < 0.1
C) < 10
D) < 0.001

Question 10

If you wanted to compare the heights of a random sample of 5-year olds in Texas with that of the entire population in the United States, which statistical test would you use?

A) Regression analysis
B) One-Sample z- or t-test
C) Multiple regression analysis
D) Confidence interval

Question 11

Categorical variables have a numeric value.

Question 12

A hypothesis must be based on a substantial amount of evidence.

Question 13

Type I error happens when statistically significant differences are erroneously discovered between two sets of observations when none really existed.

Question 14

Correlation implies that one of the variables depends on the other.

Question 15

Variables that can have an infinite number of fractional values are called _______________.

Question 16

In statistics, the term ______________ refers to the value that is at the midpoint in a data set when data are arranged in a numerically ascending or descending order.

Question 17

________________ analysis examines the simultaneous relationship of one or more independent variables with another variable, with the assumption that the values of the latter depend on the values of the former.

Question 18

Which of the following are examples of continuous variables?

A) Racial/ethnic groups in a population
B) Number of books in a library
C) Time
D) Distance

Question 19

Which of the following correlation coefficients would indicate a strong a positive relationship between two variables?

A) 0.00007
B) -0.9
C) 0.88
D) -0.003

Question 20

Calculate and enter the mean, median and mode for the following numbers: 1, 7, 9, 2, 1
Mean ___________
Median ___________
Mode ___________