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In: Math
A researcher hypothesizes that caffeine will affect the speed with which people read. To test this,...
A researcher hypothesizes that caffeine will affect the speed with which people read. To test this, the researcher randomly assigns 8 people into one of two groups: 50mg Caffeine (n1=4) or no Caffeine (n2=4). An hour after the treatment, the 8 participants in the study are asked to read from a book for 1 minute; the researcher counts the number of words each participant finished reading. The following are the data for each group:
50mg Caffeine (group 1)
450 400 500 450
No Caffeine (group 2)
400 410 430 440
Use α-level of .05 to answer the questions below:
i. Draw the sampling distribution of the difference between independent sample means, and locate M1-M2, μ(m1-M2) on the x-axis. What is the value of μ(m1-M2 under the assumption of the null hypothesis; indicate this on the x-axis as well.
j. Given the total df for this problem, what is the critical value of t? Indicate the critical value of t (and its value) in your drawing on (i). Also, indicate what the area is in the tail beyond the critical value of t.
k. Can you reject the null hypothesis?
l. Can you accept the research hypothesis?
Solutions
milcah answered 1 month agoRelated Solutions
A researcher hypothesizes that caffeine will affect the speed with which people read. To test this,...
A researcher hypothesizes that caffeine will
affect the speed with which people read. To test this, the
researcher randomly assigns 8 people into one of two groups: 50mg
Caffeine (n1 = 4) or No Caffeine (n2 = 4). An hour after the
treatment, the 8 participants in the study are asked to read from a
book for 1 minute; the researcher counts the number of words each
participant finished reading. The following are the data for each
sample:
50mg Caffeine...
Another researcher is interested in how caffeine will affect the speed with which people read but...
Another researcher is interested in how caffeine will affect the
speed with which people read but decides to include a third
condition, a placebo group (a group that gets a pill that looks
like the caffeine group does, but it does not contain caffeine).
The researcher randomly assigns 12 people into one of three groups:
50mg Caffeine (n1=4), No Caffeine (n2=4), and Placebo (n3=4). An
hour after the treatment, the 12 participants in the study are
asked to read from...
A researcher investigated the effect of caffeine on performance on a test of attention. Twenty people...
A researcher investigated the effect of caffeine on performance
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they were all given tests of attention. What is the 〖df〗within?
What is the 〖df〗between? What is the critical value of F for
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A researcher hypothesizes that students’ performance in a test
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Mod Noise
Low Noise
3
4
6
G =
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6
8
ΣX2 =
393
4
4
6
N =
3
2
7
k =
2
3
8
T = 17
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1-way ANOVA test
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A researcher hypothesizes that people who believe in paranormal phenomena will obtain higher scores on the...
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randomly-selected people and gives them 2 tests: one is a 50-item
test that measures the extent to which they endorse beliefs in
paranormal phenomena and the other is a 30-item test that measures
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1
40
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Part A: Imagine a researcher thinks that using caffeine before a test increases test scores. If...
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students in a 120-person class to participate in a study, a good
experimental design would follow which protocol?
a.
Collect information after the test from the students about the
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b.
Ask the whole class to drink16 ounces of coffee the morning of
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Suppose you want to know if different dosages of caffeine affect students’ performance on a test....
Suppose you want to know if different dosages of caffeine affect
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The table below displays these 15 students’ scores.
Group1
Group 2
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15
26
10
16
25
9
14
23
9
13
20
6
12
21
6
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A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine,...
A student researcher performed a chromatographic separation of
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The retention time for aspartame, t a , was 265.0 s with a baseline
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Calculate the average plate height, H , in micrometers for this...
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