psych statistics

posted by .

Martha believes that a relaxation technique involving visualization will help people with mild insomnia fall asleep faster. She randomly selects a sample of 20 participants from a group of mild insomnia patients and randomly assigns 10 to receive visualization therapy. The other 10 participants receive no treatment. Each participant is then measured to see how long (in minutes) it takes him or her to fall asleep. Martha's data are below. The numbers represent the number of minutes each participant took to fall asleep.

No Treatment (X1) Treatment (X2)


22 19
18 17
27 24
20 21
23 27
26 21
27 23
22 18
24 19
22 22

The assignment (1–2 pages):

Please respond to the following questions related to the research study and data presented in the "To Prepare" section.

Should Martha use an independent-samples t-test or a related samples t-test? Explain your answer.


What are the independent and dependent variables?


Using the fact that Martha believes the treatment will reduce the amount of time to fall asleep, state the null and alternate hypotheses.


Would you use a one-tailed or two-tailed test? Explain your response.


What is the df?


Consider that a = .05. Then use Appendix B, Table 2 to determine the critical value, state the value, and how you found it.


Consider that tobt = 1.49. Report the statistical results using the correct format.


What should Martha conclude?


I am very confused, the last paper I did it all wrong. Help please

  • psych statistics -

    dependent variable

    One tail
    df = 9
    t = (dbar-mud)/sd/sqrt(n)
    t = (2-0)/2.9439/sqrt(10)
    t = 2.15
    test statistic = 2.15

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. statistics/probability

    in testing a new drug. researchers found that 20% of all patients using it will have a mild side effect. a random sample of 14 patients using the drug is selected. find the probability that: a) exactly three will have mild side effects. …
  2. Stats

    In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side …
  3. PLZ help!! Stats....

    In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side …
  4. Can u plz help me PsyDag?? Stats

    In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side …
  5. Can u help me Ms. Sue...Stats

    In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side …
  6. Stats

    In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side …
  7. Math

    In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side …
  8. statistics/psyc

    Researchers are interested in the effectiveness of a particular treatment for insomnia. Fifty insomnia sufferers who responded to a newspaper ad are contacted, and each is given a pill with instructions to take it before going to sleep …
  9. Statistics

    . In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 15 patients using the drug is selected. Find the probability that: (A) exactly three will have this mild …
  10. statistics

    . In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 15 patients using the drug is selected. Find the probability that: (A) exactly three will have this mild …

More Similar Questions