A) A dataset has a mean of 2 and standard deviation of 4. If two points are added to each score in a dataset, what will happen to the mean and standard deviation? the mean and standard deviation will remain the same the mean and standard deviation will increase by 2 points the mean will increase by 2 points and standard deviation will remain the same the mean and standard deviation will remain the same and the standard deviation will increase by 2 points
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
A)
A dataset has a
-
- the mean and standard deviation will remain the same
- the mean and standard deviation will increase by 2 points
- the mean will increase by 2 points and standard deviation will remain the same
- the mean and standard deviation will remain the same and the standard deviation will increase by 2 points
B)
- A sample of n= 4 scores has SS = 60. What is the variance for this sample?
- 15
- 20
- 60
- 30
C)
- If an entire population with μ = 60 and σ = 8 is transformed into z-scores, then the distribution of z-scores will have a mean of ___ and a standard deviation of ___
- 60; 8
- 1; 0
- 0;1
- 0;8
D)
- Sample sizes of 4 are selected from a population with μ = 40 and σ = 8. What is the standard error for the distribution of sample mean?
- 4
- 3
- 8
- 6
E)
- You complete a hypothesis test using alpha = .05, and based on the evidence from the sample, your decision is to reject the null hypothesis. If the treatment actually does have an effect, which of the following is true?
- You have made a Type I error
- You have made a Type II error
- You might have made a Type I error, but the probability is only 5% at most
- You have made the correct decision
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