PSYC 2111 Exam 1

Participant Score X1 4 X2 3 X3 5 X4 5 X5 2 The data above is from a sample. For the data above, what is the z score for X1?

0.15

120 students came to my party. I sampled 5 of them to ask how many cookies they ate. Here are my results: Cookies 1 3 3 2 1 What is the standard deviation for this data? Remember, this is a sample.

1

120 students came to my party. I sampled 5 of them to ask how many cookies they ate. Here are my results: Cookies 1 3 3 2 1 What is the variance for this data? Remember, this is a sample.

1

I asked my class what they had for breakfast. 10 students had cereal, 5 students had eggs, and 3 students had no breakfast. How many variables are represented here? -1 -3 -2 -10

1

120 students came to my party. I sampled 5 of them to ask how many cookies they ate. Here are my results: Cookies 1 3 3 2 1 What is the mode for this data?

1, 3

I want to know how many web-enabled devices students have with them. I sampled 5 students. Here is their data: Number of devices 4 3 5 5 2 What is the s for this data?

1.3

I want to know how many web-enabled devices students have with them. I sampled 5 students. Here is their data: Number of devices 4 3 5 5 2 What is the variance for this data?

1.7

I asked my class what they had for breakfast. 10 students had cereal, 5 students had eggs, and 3 students had no breakfast. What is the frequency of cereal? -5 -There is no frequency represented here. -10 -3

10

I asked my students how many headaches they had experienced in the last week. Below is the data: Participant vs. Headaches 1 1 2 2 3 5 4 3 5 0 6 0 7 3 8 2 9 0 10 0 11 2 12 1 Calculate ΣX

19

120 students came to my party. I sampled 5 of them to ask how many cookies they ate. Here are my results: Cookies 1 3 3 2 1 Calculate the mean for this data.

2

120 students came to my party. I sampled 5 of them to ask how many cookies they ate. Here are my results: Cookies 1 3 3 2 1 What is the median for this data?

2

15 recent college graduates were asked how many hours they spent watching Netflix within the last 24 hours. Here are their results: Netflix 1 3 6 2 1 2 0 10 2 4 0 4 9 5 5 What is the mode for these data?

2

How many variables are represented on a scatterplot? -3 -None -1 -2

2

15 recent college graduates were asked how many hours they spent watching Netflix within the last 24 hours. Here are their results: Netflix 1 3 6 2 1 2 0 10 2 4 0 4 9 5 5 What is the median for these data?

3

15 recent college graduates were asked how many hours they spent watching Netflix within the last 24 hours. Here are their results: Netflix 1 3 6 2 1 2 0 10 2 4 0 4 9 5 5 What is the x bar (mean) for this data?

3.6

15 recent college graduates were asked how many hours they spent watching Netflix within the last 24 hours. Here are their results: Netflix 1 3 6 2 1 2 0 10 2 4 0 4 9 5 5 What is the mean for these data?

3.6

I asked my students how many headaches they had experienced in the last week. Below is the data: Participant vs. Headaches 1 1 2 2 3 5 4 3 5 0 6 0 7 3 8 2 9 0 10 0 11 2 12 1 Calculate (ΣX)^2

361

I want to know how many web-enabled devices students have with them. I sampled 5 students. Here is their data: Number of devices 4 3 5 5 2 What is the ( ∑ X ) 2 for this data?

361

Consider a normal distribution of scores (a distribution with a normal curve). In this distribution: μ = 50 σ = 10 For this distribution, ___% of the scores in this distribution fall between the raw scores of 40 and 52. Note: you will need to use the table at the end of the book.

42.06

I asked my students how many headaches they had experienced in the last week. Below is the data: Participant vs. Headaches 1 1 2 2 3 5 4 3 5 0 6 0 7 3 8 2 9 0 10 0 11 2 12 1 Calculate ΣX^2

57

Consider a normal distribution of scores (a distribution with a normal curve). In this distribution: μ = 50 σ = 10 For this distribution, ___% of the scores in this distribution fall below the raw score of 52. Note: you will need to use the table at the end of the book.

57.93

Consider a normal distribution of scores (a distribution with a normal curve). In this distribution: μ = 80 σ = 12 For this distribution, ___% of the scores in this distribution fall below the raw score of 62. Note: you will need to use the table at the end of the book.

6.68

Consider a normal distribution of scores (a distribution with a normal curve). In this distribution: μ = 50 σ = 10 For this distribution, 87.90% of the scores in this distribution fall below the raw score of ____. Note: you will need to use the table at the end of the book.

61.7

In a normal curve, what percentage of scores are between μ − 1 σ and μ + 1 σ ? -34.13% -68.26% -47.72% -84.13%

68.26%

Consider a normal distribution of scores (a distribution with a normal curve). In this distribution: μ = 80 σ = 12 For this distribution, ___% of the scores in this distribution fall below the raw score of 86. Note: you will need to use the table at the end of the book.

69.15

Consider a normal distribution of scores (a distribution with a normal curve). In this distribution: μ = 80 σ = 12 For this distribution, ___% of the scores in this distribution fall above the raw score of 68.

84.13

Consider a normal distribution of scores (a distribution with a normal curve). In this distribution: μ = 80 σ = 12 For this distribution, ___% of the scores in this distribution fall below the raw score of 92.

84.13

I asked my class what they had for breakfast. 10 students had cereal, 5 students had eggs, and 3 students had no breakfast. If I were to graph this data, what would I create? -scatterplot -Bar Graph -Histogram -none of these

Bar Graph

I asked my class what they had for breakfast. 10 students had cereal, 5 students had eggs, and 3 students had no breakfast. What kind of data do I have? -Continuous -Categorical

Categorical

If I have a hypothesis that wearing glasses causes you to become smarter, then the number of people wearing glasses is _____ data. -Categorical -Quantitative -Measurement -Frequency

Categorical

Go to https://www.census.gov/quickfacts/fact/table/US# The percentage of people who identify as "Two or More Races" is _______ data. -Categorical -Measurement -Frequency -Quantitative

Categorical & Frequency

I wanted to know how much time my students spend watching Netflix. Here is the data: Participant Hours of Netflix 1 2 2 3.5 3 1.5 4 4 5 6.4 6 3 7 4.5 What kind of data is the Netflix variable? -Continuous -Categorical

Continuous

I wanted to know how much time my students spend watching Netflix. Here is the data: Participant Hours of Netflix 1 2 2 3.5 3 1.5 4 4 5 6.4 6 3 7 4.5 6.4 would be an appropriate bin on the X axis if I graphed this data. -False -True

False

Ratio example:

How many minutes have passed since you last ate? -The answer can be zero minutes, and therefore there is a definite zero

I look at the thermometer. I see that it is 10o Celsius. This data is: -Nominal -Interval -Ratio -Ordinal

Interval

I asked my class what they had for breakfast. 10 students had cereal, 5 students had eggs, and 3 students had no breakfast. What kind of data do I have? -Nominal -Ordinal -Interval -Ratio

Nominal

If I measure what is your major, I will get _____ data. -Interval -Nominal -Ordinal -Ratio

Nominal

Rating how much you love doing homework on a scale from 1-10 gives you ____ data. -Nominal -Interval -Ordinal -Ratio

Ordinal

Population is to Sample is to

Population= Parameter (PP) Sample= Statistic (SS)

If I have a hypothesis that wearing glasses causes you to become smarter. I measure "smartness" by looking at my participants' IQ score. The IQ score is _____ data -Quantitative -Frequency -Measurement -Categorical

Quantitative & Measurement

I measure everyone's height. The data I get is: -Nominal -Ratio -Ordinal -Interval

Ratio

What is the whole point of this class?

To understand variables in the population when we can't measure them (take information from a sample and apply it to a population)

Interval example:

What is your body temperature in Fahrenheit? -Intervals are exactly the same, NOT zero

Nominal example

What is your favorite color? -blue -red -yellow

sample

a subset of the population

inferential statistics

deals with taking information from a sample and applying it to a population

For one section of this class, I calculate the average grade on an exam. The average grade is a(n): -descriptive statistic -dependent variable -inferential statistic -independent variable

descriptive statistic

I asked my class what they had for breakfast. 10 students had cereal, 5 students had eggs, and 3 students had no breakfast. If I graph this data, what would be my Y axis? -Ratio -abscissa -frequency -Breakfast

frequency

I wanted to know how much time my students spend watching Netflix. Here is the data: Participant Hours of Netflix 1 2 2 3.5 3 1.5 4 4 5 6.4 6 3 7 4.5 What will be the Y axis of my graph? -Participant -Netflix -Hours -frequency

frequency

I wanted to know how much time my students spend watching Netflix. Here is the data: Participant Hours of Netflix 1 2 2 3.5 3 1.5 4 4 5 6.4 6 3 7 4.5 If I graph this data, I will create a: -histogram -none of these -scatterplot -bar chart

histogram

If my hypothesis is that "wearing glasses causes you to be smarter", then "wearing glasses is the ______ variable -dependent -independent -outcome -both independent and dependent

independent

For one section of this class, I calculate the average grade on an exam. I want to use this data to determine what the grade distribution will be for all of the sections of the class. The grade distribution for all of the sections of the class is calculated using a(n) -true experiment -inferential statistic -parameter -descriptive statistic

inferential statistic

I assign people from the USA the number 2. People from Mexico are assigned the number 3. People from Canada are assigned the number 1. This data is: -ratio -Nominal -ordinal -interval

nominal

Go to https://www.census.gov/quickfacts/fact/table/US# (Links to an external site.) On this page, you see that there is a lot of information from the census bureau. Under the population heading, the number 308,745,538 is a -dependent variable -independent variable -statistic -parameter

parameter

μ =

population mean

For one section of this class, I calculate the average grade on an exam. I want to use this data to determine what the grade distribution will be for all of the sections of the class. The section that I measured is the: -statistic -population -sample -parameter

sample

x-bar

sample mean

If data is gathered from CU students, it is considered a sample and is therefore a

statistic

population

the complete set of individuals the investigator is interested in studying

Y-axis is always

the frequency

120 students came to my party. I sampled 5 of them to ask how many cookies they ate. Here are my results: Cookies 1 3 3 2 1 What symbol represents the mean for this data? -μ -SS -σ -x bar

x bar

Participant Score X1 4 X2 3 X3 5 X4 5 X5 2 The data above is from a sample. For the data above, what is the z score for X5?

-1.38

What type of data is the serial number of a computer?

-nominal -distinguishes one from another

dependent variable

-the outcome of the variable that is manipulated -deals with ordinal data -opinion scales or 1-10 scales

independent variable

-variable that is manipulated -deals with nominal data -any yes/no question is nominal

I asked my students how many headaches they had experienced in the last week. Below is the data: Participant vs. Headaches 1 1 2 2 3 5 4 3 5 0 6 0 7 3 8 2 9 0 10 0 11 2 12 1 What is X6 ?

0

The sum of deviations is always

0

What is ∑ ( x − μ ) -0 -S S p o p -σ -We cannot tell based on the provided information.

0