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STATS Problems - A cognitive psychologist measures the reaction times

Question # 00009768
Subject: Statistics
Due on: 03/07/2014
Posted On: 03/07/2014 01:17 AM

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A cognitive psychologist measures the reaction times of 6 subjects to emotionally laden words. The following scores in seconds are recorded: 25, 27, 31, 36, 42, 47. The psychologist wants to know how her subject compared to a national sample who scored
a. Mean
b. Median
c. Mode
d. Range
e. Variance
f. Standard Deviation
g. If Sally’s reaction time is 25 second, what’s my z-score for this sample? How many standard deviations is sally away from the mean?

Now the psychologist from Problem 1 wants to know how her sample compares to a national sample of people who scored an average of 35 seconds with a standard deviation of 3.00.
a. State her null and alternative hypotheses.
b. What statistical test would you use? Why?
c. Is this a two-tail or one-tail test?
d. What alpha level are you using and what is its corresponding critical value?
e. Use the appropriate test to calculate the needed value for your test.
f. Summarize your result.

A physiologist has the hypothesis that hormone Z is important in increasing sexual behavior. To investigate this hypothesis, 4 rats were randomly selected to take hormone Z. The rats were injected with hormone Z and then were placed in individual housing with a sexually receptive female rat. The physiologist took note of the number of times these rats mated before and after they had the injection. The results are shown in the table below:
Pre-injection Post-injection
4 6
4 7
5 8
6 6
X ?_pre= 4.75 X ?_post= 6.75
What are the IV and DV?
What are the null and alternative hypotheses?
Is this a two-tail or one-tail test?
Which statistical test would you use? Why?
What alpha level are you using and what is its corresponding critical value?
Use the appropriate test to calculate the needed value for your test.
Summarize your results.

Tags reaction times measures psychologist problems cognitive stats test sample value standard hormone psychologist rats onetail alpha hypotheses deviation null alternative level twotail critical physiologist hypothesis results summarize needed corresponding appropriate calculate using statistical reaction seconds wants know

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STATS Problems - A cognitive psychologist (SOLUTION)

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Posted On: 03/07/2014 01:20 AM
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Tutorial Preview …If xxxxxxxxx reaction xxxx is 25 xxxxxxx what’s my xxxxxxx for xxxx xxxxxxx How xxxx standard deviations xx sally away xxxx the xxxxx xxx z-score xxx Sally is x 1187 standard xxxxxxxxxx below xxx xxxx…
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Preview: to xxxx hormone x The rats xxxx injected with xxxxxxx Z xxx xxxx were xxxxxx in individual xxxxxxx with a xxxxxxxx receptive xxxxxx xxx The xxxxxxxxxxxx took note xx the number xx times xxxxx xxxx mated xxxxxx and after xxxx had the xxxxxxxxx The xxxxxxx xxx shown xx the table xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 46475866X _pre= x 75X xxxxxx x 75What xxx the IV xxx DV?The independent xxxxxxxx (IV) xx xxx administration xx hormone Z xxx dependent variable xxxx is xxx xxxxxxxxxx between xxx number of xxxxxxxxxxxxxx and pre-injection xxxxxxx What xxx xxx null xxx alternative hypotheses? xxx null hypothesis xx that xxx xxxxxxxxxx between xxx number of xxxxxxxxxxxxxx and pre-injection xxxxxxx is xxx xxxxxxxxx from xxxx The alternative xxxxxxxxxx is that xxx difference xxxxxxx xxx number xx post-injection and xxxxxxxxxxxxx matings is xxxxxxx than xxxx xxxxxxxxxxxxx the xxxxxxxxxx are:Null hypothesis: xxxxxxxxxxx hypothesis: Is xxxx a xxxxxxxx xx one-tail xxxxxxxxxx on the xxxxxxxxxxx hypothesis, this xx a xxxxxxxx xxxx (right-sided) xxxxx statistical test xxxxx you use? xxxx This xxxx xxxxxx.....
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