Exams and Studying
Is studying related to exam performance? Students are polled on the number of hours they studied for their exam and their exam score is recorded. Measured Variable 1 (predictor): Exam study hours. Measured Variable 2 (outcome): Exam score.
What is Pearson's Correlation.
Does presentation format influence your memory? Participants memorize a list of words. Half of the words are written on paper and half of them are presented over a speaker. Five minutes later, participants are asked to recall as many words as they can. Predictor: Presentation Type (written vs audio) Outcome: Number of words recalled. *Assumptions are violated and transformation didn't work.
Paired samples t-test with bootstrapping.
Do children who observe violent behavior behave more violently? Two groups of kids observed an adult interacting with a doll. In one group, the adult hit the doll and in the other, the adult played with it gently. Researchers then gave the doll to the child and observed the number of violent acts the child produced. Predictor: Adult modeling (violent vs nonviolet) Outcome: Number of violent acts by the child.
Independent Samples t-test
Does smoking predict respiratory function? A doctor records the number of years a patient has been smoking and the number of times they smoke per day to see if it predicts their score on a test of respiratory function. Predictor: # of years smoking & # of times per day Outcome: Respiratory function score.
What is multiple regression.
Do children who observe violent behavior behavior more violently? Two groups of kids observed an adult interacting with a doll. In one group, the adult hit the doll and in the other, the adult played with it gently. Researchers then gave the doll to the child and observed the number of violent acts the child produced. Predictor: Adult modeling (violent vs nonviolet) Outcome: Number of violent acts by the child.
What is an independent samples t-test?
Does amount of study time have an effect on exam performance? Two groups of students are asked to study either 5 hours or 10 hours for an exam. Their grades are recorded. Predictor: Study time (5 or 10 hours) *Between-subjects Outcome: Exam score
What is an independent samples t-test?
What memorization strategy is best? Three groups of subjects are asked to memorize a list of numbers. One group uses memorization strategy A, one uses strategy B, and the third uses strategy C. Their memory for the list of words is tested. Predictor: Memorization Strategy (A v B b C) Outcome: Number of words remembered.
One-way ANOVA
Is studying related to exam performance? Students are polled on the number of hours they studied for their exam and their exam score is recorded. Measured Variable 1 (predictor): Exam study hours. Measured Variable 2 (outcome): Exam score.
What is Pearson Correlation?
What type of cognitive intervention most reduces smoking activity in heavy smokers? A single group of heavy smokers participated in two conditions: In one, they were asked to think about black lungs for 2 minutes and then report their nicotine craving (on a scale of 0-10). In a second, they were asked to think about running a 10K and then report their cigarette craving. Predictor: Type of intervention (negative image vs positive image) Outcome: Level of nicotine craving
What is a paired-samples t-test.
Does aggressive behavior at home predict behavioral problems at home? The number of times police have been called to a home were recorded, along with a teacher's rating of children's behavioral problems at school. Researchers want to know if they can predict behavioral problems from police visits. Predictor: # of times police called to home Outcome: Rating of behavioral problems at school.
What is simple regression.
Does amount of study time predict exam performance? A prof records the number of hours each student studied and the score they got on the exam. Then, they try to predict exam score based on the number of hours studied.
What is simple regression?
What factors contribute to memory decline? Performance on a memory test is collected in a group of subjects along with their age, physical health, and number of years of education. Researchers are curious which of these is the biggest predictor of memory ability.
What is multiple regression?
What factors contribute to memory decline? Performance on a memory test is collected in a group of subjects along with their age, physical health, and number of years of education. Researchers are curious which of these is the biggest predictor of memory ability.
What is multiple regression?
To what degree are smoking and blood pressure related? A doctor measures # of cigarette's smoked per day and their blood pressure to see if the two variables are related.
What is a Pearson's correlation.
Does exposure to violence increase violent behavior? Children visited a lab two times. On one visit, they watched a violent TV show and then played on a playground with other kids. On another visit, they watched a peaceful TV show before playing on a playground. On both visits, the number of aggressive acts each child produced on the playground was recorded.
What is a paired samples t-test?
Does study time have an effect on exam performance? One group of students was asked to study for 2 hours, one for 5, hours, and one for 10 hours. Their exam performance was compared.
What is one-way independent ANOVA.
Does volume influence memory for words? Participants listed to 90 words. Thirty are played quietly, 30 are played at a normal speaking level, and 30 are played at a shouting level. Then their memory for those words are tested.
What is one-way repeated measures ANOVA?
Does volume influence memory for words? Participants listened to 90 words. Thirty are played quietly, 30 are played at a normal speaking level, and 30 are played at a shouting level. Then their memory for those words was tested.
What is repeated measures ANOVA.
Does a drug intervention reduce smoking frequency? Two groups of heavy smokers each participated in a different intervention. One intervention used a drug to reduce nicotine cravings and the other used a placebo to reduce cravings. The number of times they smoked while taking the drug/placebo was recorded. Assumptions were violated.
Ind samples t-test with transformation or bootstrapping.
Does violence exposure increase violent behavior in children? Three groups of children visited a lab. One group of children was exposed to an adult hitting a doll. One group saw an adult playing gently with a doll. The third group did not observe any adult/doll interaction. All of the children were then allowed to play with the doll and the number of aggressive acts they produce were recorded.
What is a one-way independent measures ANOVA?
Does study time have an effect on exam performance? Each student took 3 exams. In one, they were asked to study for 2 hours, for another they were asked to study for 5, hours, and for another they were asked to study for 10 hours. Their exam performance was compared.
What is a repeated measures ANOVA?
You have a study with two IVs, each with two levels, and the same subjects in each group. What statistical test do you need?
What is repeated measures factorial ANOVA
Does Christmas music make you happy? Three classes of students each listened to Christmas music for different numbers of times (0 minutes, 30 minutes, 2 hours) and their happiness was recorded at the end of the session.
Independent one-way ANOVA
I'd like to figure out how much someone smokes, relative to other smokers. More specifically, I'd like to know how many standard deviations a person is from the mean in number of cigarettes smoked per day. What could I calculate to assess this?
A z-score
I like to know the relationship between number of hours of violent TV watched per week and number of behavioral problems at school. I record each of these two things and find that I have violated some of my assumptions.
Pearson's correlation with bootstrapping or transformation.