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Question 5 of 10 A z-score of 2.0 is two standard deviations above the mean of the distribution (t).

True
False
I chose answer A

The z scores is a ratio of difference to variability (t).
True
False
I chose False

Question 6 of 10 What’s the probability that an individual, selected at random, will score below the mean on any normally distributed characteristic? (Points : 1)
p = 0
p = .1
p = .5
p = 1.0
I chose p=0

A statistically significant outcome in a z-test indicates which of the following? (Points : 1)
The sample is not characteristic of the population.
The sample could not have been randomly selected.
The sample is characteristic of the population.
The sample represents other samples in the original population.

I chose the last one
Question 8 of 10 A distribution where the mean and standard deviation have pre-determined values calls for ________. (Points : 1)
raw scores
z scores
modified standard scores
percentile rankings


I chose modified standard scores

Question 9 of 10 Which is true of a one-tailed test? (Points : 1)
The alternate hypothesis specifies the direction of difference.
The null hypothesis specifies the direction of difference.
There is no alternate hypothesis.
The null hypothesis becomes the research hypothesis.




I chose there is no alternate hyothesis

Question 10 of 10 What is the critical value of t for a two-tailed t-test in which n = 10? (Points : 1)
2.262
2.228
.05
.01
I chose .05

I'll help with the last two:

9. The alternate hypothesis shows a specific direction in a one-tailed test.
10. 2.262 (degrees of freedom would be n - 1)

A statistically significant outcome in a z-test indicates which of the following? (Points : 1)

The sample is not characteristic of the population.
The sample could not have been randomly selected.
The sample is characteristic of the population.
The sample represents other samples in the original population.

Question 5: The correct answer is False. A z-score of 2.0 is actually two standard deviations below the mean, not above.

Question 6: The correct answer is p = 0. The probability of scoring below the mean on a normally distributed characteristic is always 0 because the mean represents the average.

Question 7: The correct answer is The sample is not characteristic of the population. A statistically significant outcome in a z-test indicates that the sample's results are unlikely to have occurred by chance alone and therefore may not accurately represent the population.

Question 8: The correct answer is z scores. A distribution where the mean and standard deviation have pre-determined values calls for the use of z scores.

Question 9: The correct answer is The alternate hypothesis specifies the direction of difference. In a one-tailed test, the alternate hypothesis specifically states the expected direction of the difference between groups or conditions.

Question 10: The correct answer is 2.262. The critical value of t for a two-tailed t-test with n = 10 and a significance level of .05 is 2.262, which is based on the degrees of freedom (n-1).

Great! Here are the explanations for each of your answers:

Question 5: The statement is True. A z-score of 2.0 means that it is two standard deviations above the mean of the distribution.

Question 6: The correct answer is p = 0. The probability that an individual, selected at random, will score below the mean on any normally distributed characteristic is zero since the mean is the lowest point on the distribution.

Question 7: The correct answer is "The sample represents other samples in the original population." A statistically significant outcome in a z-test indicates that the sample represents other samples in the original population, meaning that the findings can be generalized.

Question 8: The correct answer is "z scores." A distribution where the mean and standard deviation have predetermined values calls for z scores.

Question 9: The correct answer is "The alternate hypothesis specifies the direction of difference." In a one-tailed test, the alternate hypothesis specifies the direction of difference. It tests for either a positive or negative effect, unlike a two-tailed test which tests for only a difference without specifying the direction.

Question 10: The correct answer is 2.262. The critical value of t for a two-tailed t-test depends on the level of significance and the degrees of freedom. For n = 10, the critical value at a 95% confidence level is 2.262.

Well done on your answers!