The Chi-square test for goodness of fit tests the hypothesis that the observed distribution follows a ________ distribution.
- expected
- normal
- skewed
- uniform
The Chi-square test for goodness of fit is used to determine whether the observed distribution of data follows an expected distribution.
In Bayes' theorem, what does the prior probability represent?
- The likelihood of the evidence
- The probability of an event before evidence is observed
- The probability of the evidence given the event
- The updated probability after evidence is observed
The prior probability in Bayes' Theorem is the initial or original probability of an event before new evidence is taken into account. It represents our initial belief about the event.
A histogram with two peaks is known as a ________ distribution.
- Bimodal
- Multimodal
- Normal
- Uniform
A histogram with two distinct peaks is referred to as a bimodal distribution. This might suggest that the data contains two different groups, each with their own mode, or most common value.
What assumption does the Chi-square test for goodness of fit make about the observations?
- The observations are correlated
- The observations are independent
- The observations are normally distributed
- The observations are paired
The Chi-square test for goodness of fit assumes that the observations are independent, which means that the outcome of one observation does not affect the outcome of another.
What is the null hypothesis in a Chi-square test for independence?
- The population means are equal
- The population variances are equal
- There is an association between the variables
- There is no association between the variables
The null hypothesis in a Chi-square test for independence states that there is no association between the variables - they are independent.
The ________ distribution is used when there are exactly two mutually exclusive outcomes of a trial.
- Binomial
- Normal
- Poisson
- Uniform
A binomial distribution is used when there are exactly two mutually exclusive outcomes of a trial (often referred to as a success or a failure). It models the total number of successes in a fixed number of independent trials.
What are the assumptions for conducting a Kruskal-Wallis Test?
- All of the above
- Data must be normally distributed
- Samples must be independent
- Variances must be equal
The key assumption for conducting a Kruskal-Wallis Test is that the samples must be independent.
The _______ measures the variability of the point estimate.
- Mean
- Median
- Mode
- Standard error
Standard error is a measure of the statistical accuracy of an estimate, equal to the standard deviation of the theoretical distribution of a large population of such estimates.
Converting ________ data into quantitative data involves the process of coding.
- Continuous
- Discrete
- Qualitative
- Quantitative
Converting Qualitative data into quantitative data involves the process of coding. This process involves assigning numerical values to qualitative information (such as categories or themes) so that they can be manipulated and analyzed statistically. For example, if you have data on types of pets (dogs, cats, etc.), you can assign a numerical code (1 for dogs, 2 for cats, etc.) to transform this qualitative data into quantitative data.
What is a key difference between parametric and non-parametric statistical methods?
- The amount of data they can handle
- The assumptions they make about the data distribution
- The speed at which they analyze data
- The type of variables they can analyze
The key difference between parametric and non-parametric statistical methods is the assumptions they make about the data distribution. Parametric methods assume that the data follow a certain distribution, while non-parametric methods do not make these assumptions.