# Random assignment differs from random selection

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6 . Â  Random assignment differs from random selection because :
Â random assignment is rarely achieved , but random selection is almost always achieved .
Â random assignment must be performed by the experimenter who is carrying out the study , but random selection can be carried out at the analysis stage .
Â random assignment deals with how participants in your sample are assigned to levels of the independent variable , whereas random selection deals with how you choose participants for your sample in the first place .
Â random assignment deals with how you choose participants for your study in the first place , whereas random selection deals with how participants in your sample are assigned to levels of the independent variable .
7 . Â  Most decks of playing cards contain four suitsâ€”hearts , clubs , diamonds , and spades . If you choose one card from the deck at random , what is the probability that it will be from the suit diamonds ?
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8 . Â  If we flip a coin , we would expect the probability of it landing heads to be the same as it landing tails ( e.g. , 0.50 ) . However , we are more likely to achieve this outcome the more often we flip the coin . That is , over a large number of trials , we are more likely to approximate our expected probability . This is referred to as :
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9 . Â  In a study on the effects of humor on memory , Schmidt ( 1994 ) assigned participants to read either humorous sentences or non-humorous sentences and then later tested participants ' memory for the sentences . Identify the research hypothesis for this study .
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10 . Â  In a study examining the effect of an after - school enrichment program on the intelligence ( IQ ) scores of children , a large difference was found between children attending the program and those not attending . The difference was quite large and the researchers concluded that the enrichment program improved IQ scores . Which of the following statements is consistent with this finding ?
Â The researchers rejected the null hypothesis .
Â The researchers failed to reject the null hypothesis .
Â It is not possible to determine based on the information provided .
Â The hypothesis changes throughout the process in response to any new information found during testing .
Â researchers rejected the null hypothesis .
Answer: Â  Â  researchers rejected the null hypothesis .
11 . Â  In a set of clinical trials , a pharmaceutical company wishes to assess the effectiveness of its newly developed drug for anxiety by comparing its performance with the leading drug currently on the market and with a placebo control . What research technique or techniques would be possible and appropriate in this situation ?
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12 . Â  A ( n ) _ ____ is a level of the independent variable that does NOT receive the treatment of interest in a study .
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13 . Â  If Bill , a researcher , fails to reject the null hypothesis when the null hypothesis is false , he has :
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Chapter 3 / Exercise 24
Statistics for the Behavioral Sciences
Gravetter/Wallnau
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6. Random assignment differs from random selection because: random assignment is rarely achieved, but random selection is almost always achieved. random assignment must be performed by the experimenter who is carrying out the study, but random selection can be carried out at the analysis stage. random assignment deals with how participants in your sample are assigned to levels of the independent variable, whereas random selection deals with how you choose participants for your sample in the first place. random assignment deals with how you choose participants for your study in the first place, whereas random selection deals with how participants in your sample are assigned to levels of the independent variable.
7. Most decks of playing cards contain four suitsâ€”hearts, clubs, diamonds, and spades. If you choose one card from the deck at random, what is the probability that it will be from the suit diamonds?
8. If we flip a coin, we would expect the probability of it landing heads to be the same as it landing tails (e.g., 0.50). However, we are more likely to achieve this outcome the more often we flip the coin. That is, over a large number of trials, we are more likely to approximate our expected probability. This is referred to as:
9. In a study on the effects of humor on memory, Schmidt (1994) assigned participants to read either humorous sentences or non-humorous sentences and then later tested participants' memory for the sentences. Identify the research hypothesis for this study.
##### We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
The document you are viewing contains questions related to this textbook.
Chapter 3 / Exercise 24
Statistics for the Behavioral Sciences
Gravetter/Wallnau
Expert Verified