A psychologist has developed a new method designed to help

Reference no: EM13621360

A Psychologist has developed a new method designed to help people taking an exam. The method requires the person to come to the office of the Psychologist 5 times over a 5 week period and involves hypnosis and mental exercises. In order to test whether this method is effective the Psychologist carries out the following experiment. He randomly selects 20 subjects and gives them a test. This test is known to have a mean score of 100 when given to the general population. When he gives the test to his subjects after they have gone through his program their scores have a mean of 107.1 with a standard deviation of 12.6

a) Carry out the hypothesis test to see whether or not his method improves the test taking skills by hand (assume that the assumptions are ok, use ?=0.05)

b) Carry out the hypothesis test to see whether or not his method improves the test taking skills using the p-value approach (assume that the assumptions are ok, use ?=0.05)

c) If it were true that using his method the true score goes up to 108, what would be the power of the test?

d) If it were true that using his method the true score goes up to 108, what sample size would be needed to have a power of 95%?

e) Find a 95% confidence interval for the true mean score by hand

f) What sample size would be needed so that the 95% confidence interval for the true mean score has an error of E=2.5?

Reference no: EM13621360

Questions Cloud

Determine a the velocity and acceleration of point p on : determine a the velocity and acceleration of point p on the rim of the wheel when t0.5 s and b the total distance the

Find a 95 confidence interval for the true mean score by : a psychologist has developed a new method designed to help people taking an exam. the method requires the person to

While its surfaces are maintained at 300 k using a : a long conducting rod of rectangular cross-section 20 mm x 30 mm and thermal conductivity of 20 wmk experiences uniform

Uses liquid crystal polymer matrix e 09 msi and e-glass : if a undirectional composite part is designed to have a fiber volume fraction of 0.69 and uses liquid crystal polymer

A psychologist has developed a new method designed to help : a psychologist has developed a new method designed to help people taking an exam. the method requires the person to

Test the claim that the babies born to mothers who : some nurses in county public health conducted a survey of woen who had received inadequate preatal care. they used

How large a sample should be surveyed to estimate the true : how large a sample should be surveyed to estimate the true proportion of college students who do laundry once a week

It is thought that the application of a plasma coating that : it is thought that the application of a plasma coating that conatins submicron particles of tungsten carbide will

Determine the irreversible power loss within the dam and : the hoover dam has a capacity to produce 2080 mw of electrical power. the difference in height between the surface of

User Account

All Pages