Multiple Choice Flashcards
Which of the following is not a common way to display probability distributions for a discrete, random variable
A) relative frequency, distribution table
B) relative frequency, histogram
C) formula given by p(x)
D) scatter plot of (x,p(x)) ordered pairs
D
Do people better remember what they learned if they are in the same physical space where they first learned it? Researchers asked people to learn a set of 20 unrelated objects two days later, these people were asked to recall the objects learned on the first day. Some of the people were asked to recall the objects in the same room, where they originally learned the objects. The others were asked to recall the objects in a different room. People were assigned at random to one of these to recall conditions. The author found that the data on the number of objects recalled supported the claim that recall is better when people return to the original learning context. Is the interference made one that involves estimation or one that involves hypothesis testing?
Hypothesis testing
An article describes a study in which each painting and a sample of 52 paintings of the Last Supper was analyzed by comparing the size of the food plates, and the paining to the head sizes of the people in the painting. For paintings that were painted prior to the year 1500, the estimated average plate two head size ratio was smaller than the ratio for the paintings that were painted after the year of 1500. Is the interference made one that involves estimation or one that involves hypothesis testing?
Estimation
A study of adult Americans conducted by the polling organization ipsos asked each person in the sample whether he or she self identified as an entrepreneur. The responses to the question were used to learn about the population of adult Americans, who self identify as an entrepreneur.
What is the question type?
a) estimation
b) hypothesis testing
What is the study type?
a) experimental data
b) sample data
Is the data categorical or numerical?
a) categorical
b) numerical
How many variables?
a) one
b) two
c) more than two
How many samples or treatments are there?
a) one
b) two
c) more than two
What is the appropriate method for analysis of data?
A
B
A
A
A
One sample z confidence interval, for a proportion
In a study to determine if using low intensity, laser therapy reduces pain for orthodontic patients who are fitted with new braces, patients were randomly assign to either a control group (who did not receive laser treatment) and an experimental group who did receive laser treatment. The researchers found that the main pain rating was lower for those in laser treatment group than those in the control group both two days and six days after receiving braces. The researchers used these data to determine if there was evidence to support the claim that the main pain rating is lower for patients who receive the laser treatment.
What is the question type?
a) estimation
B) hypothesis testing
What is the study type?
A) experimental data
B) sample data
Is the data categorical or numerical?
A) categorical
B) numerical
How many variables?
A) one
B) two
C) more than two
How many samples or treatments are there?
A) one
B) two
C) more than two
What is the appropriate method for analysis of data?
B
A
B
A
B
Two sample t or paired t test for a difference in means
The authors of a paper collected data from 218 children on foot arch height and motor ability. The resulting data were used to investigate the relationship between arch height and motor ability.
What is the question type?
What is the study type?
Is the data categorical or numerical?
How many variables?
How many samples or treatments are there?
What is the appropriate method for analysis of data?
Estimation
Sample data
Numerical
Two
One
?
In the process EMC ^3 what does step E represent?
A) explain the sample statistic you wish to estimate
B) explain the sample characteristic you wish to estimate
C) explain the population statistic you wish to estimate
D) explain the population characteristic you wish to estimate
D
In the process EMC ^3 or HMC ^3 what does M represent?
A) make a graphical display
B) select a potential method
C) calculate the mean of the data set
D) measure the value of the response variable
B
In the process EMC^3 or HMC^3 what does the first step C represent?
A) perform all calculations
B) check all calculations
C) check if the method is appropriate
D) communicate results of the study
C
In the process EMC^3 or HMC^3 what does the second step C represent?
A) perform calculations
B) check out calculations
C) check if the method is appropriate
D) communicate result of the study
A
In the process EMC^3 or HMC^3 what does the third step C represent?
A) perform calculations
B) check out calculations
C) check if the method is appropriate
D) communicate result of the study
D
In the process HMC^3 what does step H represent?
A) definenthe hypothesis that will be tested
B) define the variables of interest
A
Which of the following is not a condition that we check in order to use the larger sample 95% confidence interval for a population proportion?
A) randomization or representative sample
B) 10 successes and 10 failures
C) independence of samples
C
