In an independent groups t-test, unexplained variability is primarily attributab

Question

In an independent groups t-test, unexplained variability is primarily attributable to the

In order to conduct a one sample z-test, the population ___________ must be ___________.

An almost perfect negative correlation between the conditions tested in a repeated measures design reflects

Statistical power can be represented symbolically as

As sample size increases, the critical value for a one sample z-test

If the observed p-value equals 0.07 in a two-tailed hypothesis test, what would the p-value be for a directional test?

Dr. Len hypothesizes that aspartame reduces short-term memory. To test this hypothesis, he gives 10 participants a beverage with aspartame and 10 participants a beverage without aspartame. He then measures the ability to recall a list of numbers. What type of designed is being employed?

Explanation / Answer

a)

In an independent groups t-test, unexplained variability is primarily attributable to the individual differences and sampling error

b)

In order to conduct a one sample z-test, the population standard deviation must be known.

c)

Ans: a strong relationship between the independent and dependent variables

Perfect negative correlation suggests that there is strong relationship between the two variables.

d)

Statistical power can be represented symbolically as 1 – beta

e)

As sample size increases, the critical value for a one sample z-test remains the same. (as the critical value of a z test is dependent only on the alpha)

f)

If the observed p-value equals 0.07 in a two-tailed hypothesis test, what would the p-value be for a directional test?

Ans: 0.14

For one direction test, p-value would be 0.07*2 = 0.14

g)

Dr. Len hypothesizes that aspartame reduces short-term memory. To test this hypothesis, he gives 10 participants a beverage with aspartame and 10 participants a beverage without aspartame. He then measures the ability to recall a list of numbers. What type of designed is being employed?

Ans: Between subjects

Since the study involves comparison of means of two groups, hence the design employed is Between Subjects

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