3. Fill in the blanks. f. Assuming that the difference between two independent s

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3. Fill in the blanks. f. Assuming that the difference between two independent sample means is 12, S2difterence 36, the calculated t score should be and 8. If a psychologist interested in the effects of smell on concentration has 20 participants perform a standard task while exposed to an unpleasant smell and another2 participants perform the same task without being exposed to the unpleasant smell, t appropriate test to analyze the data is a t test for 0 he h. If 15 participants take a creativity test twice, once in a normal mental state and once under the influence of an experimental drug, the appropriate test to analyze the data is a t test for_ i. The shape of the distribution of differences between means will be A team of cognitive psychologists studying the effects of sleep deprivation on short-term memory decay had eight participants stay in a sleep lab for two days. Four participants were randomly assigned to a condition in which they were not permitted to sleep during that period, while the other four participants were allowed to sleep when they wanted to. At the end of the two days, the participants completed a short-term memory task that yielded the results in the table that follows. Using the.05 significance level, did sleep deprivation reduce short-term memory? Use the five steps of hypothesis testing 4. Mean Number of Letters Remembered Sleep Deprived Normal Sleep 8 8 10 4

Explanation / Answer

3.

f. t score = (sample mean - population mean) / standard deviation

given, sample mean - population mean = 12 and

standard deviation = 36

therefore, t score = 12 / 36 = 0.33

g. Two - sample t test, also known as independent samples t test

This test is used to compare the means of two independent populations

h. Paired t test

This is used to compare the means of dependent or paired set of observations. It reduces intersubject variability as it can compare within the same subject

i. The shape of the distribution of differences between means will be a normal distribution (bell-shaped curve)

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