A researcher is interested in the studying habits of American highschoolers. A group of 25 students is interviewed and the researcher finds that these students study an average of 4 hours per day. For this study, the American highschoolers are an example of a(n) _____.
population
sample
parameter
statistic
Determining what political party people associated with (democrat, republican, independent, libertarian) would involve the measurement of a(n) _____ scale of measurement.
Nominal
Ordinal
Ratio
Interval
is the number of times a particular value occurs in a set of data.
The average value is a data set is the ❌. The middle value in a data set is the ❌. The most common number in a value set is the ❌.
A group of people is asked to report how many pets they have. This would be an example of a _____ skew.
positive
negative
What is the variance if we know that the Sum of Squares is 36 and the population scores are 6? The answer is .
The average cost of an apartment in the US monthly is $1700. A simple of 1000 unit prices from around the U.S is gathered and the mean price is found to be $2300. The difference between these values is called a .
Which of the following sets of scores has the most variability?
5, 6,7, 9, 10
7, 8, 9, 10, 11, 12, 13
1, 2, 3, 4, 5, 6
5, 6, 7, 8, 9, 21, 22
Which of the following is true for the quantity Σ(X – μ)?
This is the variance, and it is always positive.
This is the standard deviation, and it is always positive.
This is the variance, and it is sometimes positive.
This is the sum of the deviations, and it is always 0.
Find the SD for a population of 8 participants, given that the sum of squares (SS) is 32.
4
2
3
8
Given the following data set: 3, 4, 5, 5, 54, 6, 7 ,7, 8, 9 What would be the most appropriate measure of central tendency to use?
Median
Standard Deviation
Mode
Mean
If we are looking at the average IQ of all Americans by examining a sample of 50 people, which of the following is true? I. The average IQ of the sample could be greater than the average IQ of the population. II. The average IQ of the sample could be smaller than the average IQ of the population. III. The average IQ of the sample must be the same as the average IQ of the population.
I and II only
I only
III only
I, II, and III
Two students, Lauren and Mary, are studying the average age at death of females in the town of Mobile, Alabama, in the year 2011. They are able to obtain all of the female death records from Mobile for the year 2011. Lauren claims that this set of records represents the population for their study. Mary claims that it is only a sample. Who is correct, and why?
Lauren is correct because the study is only about female deaths in Mobile during 2011.
Mary is correct because the records only include females.
Mary is correct because the records only include records from 2011.
Mary is correct because the records are only from Mobile rather than the entire United States.
A scientist is studying the effect of temperature on the ability of a plant to grow. She places four plants in environments of four different temperatures. All plants are given the same amount of water and light each day. She measures the height of each plant at the end of a month. Which of the following describes the dependent and independent variables?
The dependent variable is the room temperature; the independent variable is the plant heights
The dependent variable is the room temperature; the independent variable is the amount of water.
The dependent variable is the plant heights; the independent variable is the room temperature.
The dependent variable is the amount of light; the independent variable is the plant heights.
Which of these measurements are continuous?
Scores on a math test
Time it took to finish a race
Favorite color
Amount of calories eaten
Answers on a 7-point Likert scale
Hair type
Level of proficiency in piano
Based on the graph below, what is NOT the right way to calculate the sums of X?
1 + 1 + 1 + 1 + 2 + 3 + 3 + 4 + 4
4 + 2 + 6 +8
4 x 1 + 1 x 2 + 2 x 3 + 2 x 4
1 + 2 + 3 + 4
The following frequency distribution table represents test scores for a class of students. How many students scored less than 70? x f 61-68 2 69-76 6 77-84 12 85-92 5 93-100 1
20
Cannot be determined
A survey collected people's favorite movie genres. The table below shows the corresponding data. Which type of central tendency is an appropriate measurement for this data?
mean
median
mode
all of the above
What score would need to be added to the following data set to make it bimodal?
34
36
37
For a given set of scores with N = 20, if there are 10 different modes, which of the following is true?
The set contains 10 different scores, each of which has a frequency of 2.
The set contains 20 different scores, each of which has a frequency of 1.
The situation is impossible.
There is nothing that can be known about the data set without more information.
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