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A researcher has studied subjects' ability to learn to translate words into Morse code. He has experimented with two treatment conditions: in one condition, the subjects are given massed practice; they spend 6 full hours on the task. In the other condition, subjects are given distributed practice; they also spend 6 hours, but their practice is spread over four days, practicing 2 hours at a time. After the practice, all subjects are given a test message to encode; the dependent variable is the number of errors made. The researcher has matched the subjects on intelligence. The results are in the following table. Decide which statistical test would be appropriate, carry out the test, and evaluate the outcome. Assume a significance level of .05 and that the direction of the outcome has not been predicted. What are we dealing with here? t test....what must you do with the null hypothesis guys (accept or reject)?
Massed Practice Distributed Practice
S1 6 S1 5
S2 4 S2 3
S3 3 S3 2
S4 5 S4 2
S5 2 S5 3
a sample of 14 joint specimens of a particular type gave a sample mean proportional limit stress of 8.48 mpa and a
Medicine and Clinical Studies The stirrup bone, located in the middle ear, is the smallest bone in the human body, with a mean length of 3 mm.
Management of the restaurant is concerned with the time a patron must wait before being seated for dinner. Explain why the times are a population? Find the mean and median of the times.
Will you expect a positive, zero, or negative linear correlation between the two variables for each of the following examples?
The IQs of 17 students from one area of a city showed a mean of 106 with a standard deviation of 10, whereas the IQs of 14 students from another area showed a mean of 109 with a standard deviation of 7. Test for equality of variances between the I..
For each of the following pairs of variables, would you expect a positive correlation or a negative correlation between the two variables? Explain your answer.
Jim has weighted GPA of 3.84. His high school GPA's are normally distributed with a mean of 2.9 and a standard deviation of 0.5. Kim's high school uses unweighted GPA's and she has a GPA of 3.57. GPA's are also normally distributed in her high sch..
a. Use software to compare mean lengths of movies with the different ratings; first report the F statistic.
Find a 99% confidence interval for the true mean match\ length for grass courts at Wimbledon.- Find a 99% confidence interval for the true mean match length for clay courts at the U.S. Clay Court Championships.
a random sample of size 64 is drawn from a population with mean 80 and standard deviation 20. describe the sampling
What is correlation? Does correlation directly support causation, what are both sides of the argument?
This problem set introduces you to the use of SPSS for analyzing data with more than one IV and more than one DV to investigate comparison of means.
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