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8 Cards in this Set

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3. A researcher examines the short-term effect of a single treatment with acupuncture on cigarette smoking. A random sample of subjects who smoke is randomly assigned to one of two groups. One group receives the treatment with the acupuncture needles. The second group of subjects serves as a comparison group and is given relaxation instruction while on the examining table but they receive no acupuncture treatment. The number of cigarettes smoked the next day is recorded for all subjects. For the following data, determine if there is a significant effect of acupuncture on cigarette consumption.
Independent Groups T-test
2 Groups

Ho:M1=M2
H1:M1=/M2
df=n1+n2-2
2. A researcher examines the effects of sensitization on cigarette smoking in habitual smokers. A random sample of 8 smokers is selected. The number of cigarettes smoked per day is first determined for these people. The subjects are then sensitized to the effects of smoking by having them view a film that graphically shows the harm caused by cigarette smoke. A week later, the subjects are asked to count the number of cigarettes they smoke that day. Test whether sensitization has an effect on cigarette smoking. The data are as follows: (Use Alpha = .05)
Related Samples T-test
2 Groups

Ho: Md=0
H1:Md=/0
df-n-1
3. Do weather conditions affect people's moods? To examine this question, a researcher selected 3 samples of college students and administered a mood questionnaire to each student. One group was tested on a dreary, overcast and drizzly day. The second group was tested during a violent thunderstorm, and the third group was tested on a bright, sunny day
ANOVA
2+ Groups

Ho:M1=M2=M3
H1:Not all Ms are equal
dfb=K-1
dfw=N-K
3. A researcher assessed the role of routine walking in physical fitness. In this experiment, 7 pairs of subjects, all of whom lived 2 miles from work were matched into pairs for age, sex, and weight. However, one member of each pair was randomly assigned to walk to work while the other was assigned to drive to work. Subjects participated for one month and then were given a physical fitness test. Their fitness scores are below. Is there a significant difference in fitness between walkers and drivers? Test with alpha = .05.
Related Samples T-test
2 Groups

Ho: Md=0
H1:Md=/0
df-n-1
2. A psychologist would like to examine how the rate of presentation affects people's ability to memorize a list of words. A list of 15 words is prepared. For one group of subjects the list is presented at the rate of one word every 1/2 second. The second group gets one word every second. The third group has one word every 2 seconds, and the fourth group has one word every 3 seconds. After the list is presented, the psychologist asks each person to recall the entire list. The dependent variable is the number of errors in recall.
ANOVA
2+ Groups

Ho:M1=M2=M3
H1:Not all Ms are equal
dfb=K-1
dfw=N-K
4. In a study of the effects of stress on feelings of well-being, a total sample of 90 subjects is obtained and each subject is randomly assigned to either a high stress condition, a moderate stress condition, or a low stress condition. The following summary table presents the results of an ANOVA from the experiment comparing the three treatment conditions with a sample of n = 30 in each treatment.
ANOVA
2+ Groups


Ho:M1=M2=M3
H1:Not all Ms are equal
dfb=K-1
dfw=N-K
1) A researcher is interested in examining whether a relationship exists between the amount of sleep a person gets and performance in an academic setting. The researcher asks 8 students how many hours per night they slept on average for the past week and also measures their performance on a statistics quiz given at the end of the week. So, Y = # correct on the quiz and X = # of avg hours of sleep.
Correlation/Regression
2+ Groups

Ho:P=0
H1:P=/0
df=n-2
2) The data in this problem come from a study examining the relationship between the number of classes a student misses before an exam and the grade they receive on the test. Say that X = # of classes missed, and Y = test grade (out of 10).
Correlation/Regression
2+ Groups

Ho:P=0
H1:P=/0
df=n-2