ChiโSquares
A market analyst is using a chi-square goodness-of-fit test to evaluate if the observed sales frequencies over four seasons deviate from the expected equal distribution, given that the total sales number was 800 units; what is the correct c...
200 units per season, since 800 divided by four gives an equal expected value for each category.
250 units per season, taking into account a small margin of error expected in large sample sizes.
150 units per season, based on an assumption that three-quarters will reflect average sales numbers.
175 units per season, assuming one-quarter may have less footfall than the others due to natural variations.
Why do category counts need to be whole numbers when performing a Chi-Square Goodness of Fit test?
Because you cannot observe part of an occurrence/category.
To simplify calculations within the formula.
To ensure all categories have equal importance in analysis.
Whole numbers are easier for plotting on graphs.
Which condition must be met to perform a Chi-Square Goodness of Fit test?
Observations must be dependent on each other.
Data must follow a normal distribution.
All expected counts are at least 5.
The sample size must be over 30.
In setting up your chi-square goodness-of-fit test table, what should be included in the first row?
The observed frequencies per category.
Incorrect answer
Incorrect answer
Incorrect answer
How many categories must be present for a valid application of the Chi-Square Goodness of Fit test?
Two or more categories
More than five categories
Exactly three categories
Only one category
What is the purpose of a Chi-Square Goodness of Fit test in statistics?
To determine if observed data fits an expected distribution.
To assess the correlation between two variables.
To estimate the standard deviation of a population.
To calculate the mean of a data set.
For a chi square test with a sample size of 35, how large must the population be in order to satisfy the 10% rule?
Exactly 70
At least 350
At least 3500
Smaller than 3.5

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Which of the following is a method of sampling that involves selecting individuals such that each member of the population has an equal chance to be chosen?
Judgmental sampling
Simple random sampling
Convenience sampling
Voluntary response sampling
Which of the following conditions are necessary for a Chi square goodness of fit test?
Random sample AND population at least 10x the size of the of sample
Population at least 10x the size of the sample
None of the above are required
Random sample
When setting up your hypotheses for a goodness-of-fit test, what does the null hypothesis usually state?
The proportions between groups are equal.
The mean equals some hypothesized value.
The observed frequencies match the expected frequencies.
The slopes in regression models do not differ from zero.