Question: Freddie (known as Dr. K. by his students), a renow... (2 bookmarks) Fr

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Question: Freddie (known as Dr. K. by his students), a renow...

(2 bookmarks)

Freddie (known as Dr. K. by his students), a renowned researcher in sleep and dreams, hypothesized that there was a relationship between number of hours slept a night and performance on a short-term memory task (memorizing a list of 10 words). He went to one of his school's dining halls and found 50 students who agreed to participate. Each participant completed a brief form indicating average hours of sleep per night. Each participant also completed the short-term memory task. His results were in the form of: Subject 1-- 9 hours (sleep); 5 words remembered; Subject 2 -- 10 hours; 4 words, etc. After completing an analysis, Freddie determined his results were significant at the .20 probability level. He concluded that hours of sleep is related to short-term memory performance-- the more sleep, the worse the performance.

a. What type of research was used?

b. What statistic was used to compute the outcome?

c. What relationship was observed between sleep and performance?

d. What type of sampling was used in the study?

e. What conclusion can be said about the significance level?

f. Name two problems with this study?

Explanation / Answer

Answer:

Question: Freddie (known as Dr. K. by his students), a renow...

(2 bookmarks)

Freddie (known as Dr. K. by his students), a renowned researcher in sleep and dreams, hypothesized that there was a relationship between number of hours slept a night and performance on a short-term memory task (memorizing a list of 10 words). He went to one of his school's dining halls and found 50 students who agreed to participate. Each participant completed a brief form indicating average hours of sleep per night. Each participant also completed the short-term memory task. His results were in the form of: Subject 1-- 9 hours (sleep); 5 words remembered; Subject 2 -- 10 hours; 4 words, etc. After completing an analysis, Freddie determined his results were significant at the .20 probability level. He concluded that hours of sleep is related to short-term memory performance-- the more sleep, the worse the performance.

a. What type of research was used?

Observational study.

b. What statistic was used to compute the outcome?

Correlation coefficient

c. What relationship was observed between sleep and performance?

Significant negative relationship observed.

d. What type of sampling was used in the study?

Convenience sampling.

e. What conclusion can be said about the significance level?

significance level = 0.20

f. Name two problems with this study?

The samples are not selected at random and the high significance level.

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