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Define the following terms in your own words: a hypothesis-testing procedure, b, homework help psychological statistics. List the five steps of hypothesis testing, and explain the procedure and logic of each. Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For homework help psychological statistics, give a the Z -score cutoff or cutoffs on the comparison distribution at which the null hypothesis should be rejected, b the Z score on the comparison distribution for the sample score, and c your conclusion.
Assume that all populations are normally distributed. Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a hour cycle of sleeping and waking—even if they are not exposed to the usual pattern of sunlight.
To test this notion, eight paid volunteers were placed individually in a room in which there was no light from the outside and no clocks or other indications of homework help psychological statistics. They could turn the lights on and homework help psychological statistics as they wished.
After a month in the room, each individual tended to develop a steady cycle. Their cycles at the end of the study were as follows: 25, homework help psychological statistics, 27, 25, 23, 24, 25, 26, and Using the.
That is, does the average cycle length under these conditions differ significantly from 24 hours? a Use the steps of hypothesis testing.
b Sketch the distributions involved, c Explain your answer to someone who has never taken a course in statistics. Twenty students randomly assigned to an experimental group receive an instructional program; 30 in a control group do not. After 6 months, both groups are tested on their knowledge.
The experimental group has a mean of 38 on the test with an estimated population standard deviation of 3 ; the control group has a mean of 35 with an estimated population standard deviation of 5. a Use the steps of hypothesis testing, b sketch the distributions involved, and c explain your answer to someone who is familiar with the t test for a single sample but not with the t test for independent means.
Do students at various universities differ in how sociable they are? Twenty-five homework help psychological statistics were randomly selected from each of three universities in a region and were asked to report on the amount of time they spent socializing each day with other students. What should you conclude? Use the. a Use the steps of hypothesis testing, b figure the effect size for the study; and c explain your answers to parts a and b to someone who has never had a course in statistics, homework help psychological statistics.
Make up a scatter diagram with 10 dots for each of the following situations:. large but not perfect positive linear correlation. large but not perfect negative linear correlation.
Four research participants take a test of manual dexterity high scores mean better dexterity and an anxiety test high scores mean more anxiety. The scores are as follows. describe in words the general pattern of correlation, if any. figure whether the correlation is statistically significant use the. explain the logic of what you have done, writing as if you are speaking to someone who has never heard of correlation but who does understand the mean, deviation scores, and hypothesis testing ; and.
give three logically possible directions of causality, indicating for each direction whether it is a reasonable explanation for the correlation in light of the variables involved and why.
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Population Study μ σ Sample Score p Tails of Test A 5 1 7. Make up a scatter diagram with 10 dots for each of the following situations: b.
perfect positive linear correlation, c. large but not perfect positive linear correlation, d, homework help psychological statistics. small positive linear correlation, e. large but not perfect negative linear correlation, f.
no correlation, g. clear curvilinear correlation, homework help psychological statistics. Person Dexterity Anxiety 1 1 10 2 1 8 3 2 4 4 4 —2 a. Make a scatter diagram of the scores; b. describe in words the general pattern of correlation, if any; c. figure the correlation coefficient; d. explain the logic of what you have done, writing as if you are speaking to someone who has never heard of correlation but who does understand the mean, deviation scores, and hypothesis testing ; and f.
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Stats Homework Help Module 1 part 1
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