math

An ESP study discovers a subject whose performance appears to be better than guessing. The experimenter looks at many cards bearing one of five shapes (star, square, circle, wave, and cross) in an order determined by random numbers. The subject cannot see the experimenter to avoid any nonverbal clues. The answers of a non-ESP subject should be independent observations, each with probability 1/5 of success. We record 1000 samples. What are the mean and standard deviation of the proportion of successes among the 1000 attempts?

  1. 👍 0
  2. 👎 0
  3. 👁 135
asked by Hannah
  1. The mean should be (1/5)*1000 = 200 correct guesses and the standard deviation should be
    sqrt [p(1-p)N] = sqrt[(1/5)(4/5)1000] = 12.65

    1. 👍 0
    2. 👎 0
    posted by drwls

Respond to this Question

First Name

Your Response

Similar Questions

  1. statistics

    in a test for esp a subject is told that cards the experimenter can see but he cannot contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the

    asked by steven on March 24, 2010
  2. Statistics

    An ESP experiment is done in which a participant guesses which of 8 cards the researcher has randomly picked, where each card is equally likely to be selected. This is repeated for 200 trials. The null hypothesis is that the

    asked by Mea on April 16, 2014
  3. Statistics

    An ESP experiment is done in which a participant guesses which of 8 cards the researcher has randomly picked, where each card is equally likely to be selected. This is repeated for 200 trials. The null hypothesis is that the

    asked by Sheri on July 17, 2012
  4. PSYCH

    Doyen & colleagues (2012) found that __________ effects were the reason that participants changed their walking speed. A. experimenter B. subject C. both subject and experimenter D. neither subject nor experimenter MY ANSWER IS C

    asked by MAE on June 19, 2015
  5. Statistics

    An ESP experiment is conducted by a psychologist. For part of the experiment, the psychologist takes 10 cards numbered 1-10 and shuffles them. Then she looks at the cards one at a time. While she looks at each card, the subject

    asked by <3 on September 24, 2014
  6. statistics

    One test for ESP involves using Zener cards. Each card shows one of five different symbols (square,circle,star,cross,wavy lines), and the person being tested has to predict the shape on each card before it is selected. Find each

    asked by cindy on February 7, 2008
  7. advanced statistics

    suppose a certain study habit is known to be 80% effective in improving the performance of students,,if 5 students with poor performance are trained to acquire the habit,what is the probability that exactly 4 will have an improved

    asked by anonymous on November 16, 2012
  8. Statistics

    A nutritionist wants to conduct a study to validate the efficacy of an herb as an aid in weight loss. She randomly assigns half of a group of overweight persons to a treatment group who are given the herb with instructions for its

    asked by Amy on September 11, 2014
  9. math

    In an extra-sensory-perception experiment, a blindfolded subject has two rows of blocks before him. Each row has blocks numbered 1 to 10 arranged in random order. The subject is to place one hand on a block in the first row and

    asked by Anonymous on October 18, 2007
  10. Math

    In a school, 33% of the students study Biology and 16% study Chemistry. If 9% study both sciences, what percentage do not study either subject?

    asked by Zip on November 28, 2018

More Similar Questions