Experiment 1: You believe that caffeine can improve the capacity of short-term memory (STM). It is widely known that STM capacity 7 items (m=7)on average with a standard deviation of 2 items (s=2). You randomly sampled n=8 participants and have then drink a large quantity of coffee. Fifteen minutes later you administer a STM test to each participant and measure the number of items remembered. The data are shown below. Use these data to answer the following questions. Excel should be used to obtain the sample mean, standard deviation and standard error. Perform a 2-tailed z-test with a=0.05 to determine if caffeine influences memory. Number of items Participant 1 2 7 4 7 6 17 7 8 9 3.

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Given the information for experiment 1, what is the null hypothesis, standard error, z-critical, and z-observed?
9:52
8:55 7
Studensy 214
A imperial.instructure.com
Experiment 1: You believe that caffeine can improve
the capacity of short-term memory (STM). It is
widely known that STM capacity 7 items (m-7)on
average with a standard deviation of 2 items (s=2).
You randomly sampled n=8 participants and have
then drink a large quantity of coffee. Fifteen minutes
later you administer a STM test to each participant
and measure the number of items remembered. The
data are shown below. Use these data to answer the
following questions. Excel should be used to obtain
the sample mean, standard deviation and standard
error.
Perform a 2-tailed z-test with a=0.05 to determine if
caffeine influences memory.
Number
Participant
of items
1
8
2
9
3
7
4
7
6
6
8
7
7
8
9
More
Edit
II
Transcribed Image Text:9:52 8:55 7 Studensy 214 A imperial.instructure.com Experiment 1: You believe that caffeine can improve the capacity of short-term memory (STM). It is widely known that STM capacity 7 items (m-7)on average with a standard deviation of 2 items (s=2). You randomly sampled n=8 participants and have then drink a large quantity of coffee. Fifteen minutes later you administer a STM test to each participant and measure the number of items remembered. The data are shown below. Use these data to answer the following questions. Excel should be used to obtain the sample mean, standard deviation and standard error. Perform a 2-tailed z-test with a=0.05 to determine if caffeine influences memory. Number Participant of items 1 8 2 9 3 7 4 7 6 6 8 7 7 8 9 More Edit II
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