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The number of automobile accidents per day in a particular city is believed to have a Poisson distribution. A sample of 80 days during the past year
What are the positives and the negatives of the chi-square test?
Data on the number of occurrences per time period and observed frequencies follow. Use a=.05 and the goodness of fit test to see whether the data fit
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location
In a test of the quality of two television commercials, each commercial was shown in a separate test area six times over a one-week period
Is there an association between ethnic background and interest in sports in the population? Can you say anything else about this relationship?
Test the hypothesis that the treatment means are equal. Use the .05 significance level.
A researcher selected a sample of 50 residents from each of three different cities to determine if they were willing to participate in a medical experiment
The table lists the sugar content of two types of apples from three different orchards. At a=.05, test the claim that the sugar content of the apples
A college surveyed it's current students about the educational background of their parents and separated the results by program. The results are below:
Create a scenario for applying the Goodness of Fit application of Chi-square. State the hypotheses, the level of significance, the result and its meaning.
Absenteeism among assembly workers is of concern. In particular, there may be a relationship between the day of the week on which absence occurs
800 employees of OxCo Mfg. were surveyed to evaluate the company's pension plan. The table below displays some of the results of the survey.
The X^2 test statistic is a random variable that is based on frequencies.
How can you find the probability based on the data above of finding the knot still knotted (i.e., still "alive") at time t.
Use the normal approximation of the binomial probability distribution to find the interval that contains 95.44% of that distribution.
Students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice
Calculate the value of chi-square for each table. What is the number of degrees of freedom for each table?
A recent study by a large retailer designed to determine whether there was a relationship between the importance a store manager placed on advertising
One possible side effect of air pollution is genetic damage. A study designed to examine this problem exposed one group of mice to air near a steel mill
Why do the critical values from the Chi-square distribution get larger as the degrees of freedom get larger? Recall that this is opposite the pattern
Three samples of Drosophila heterozygous for the recessive genes black body (b) and rough eyes (r) were inbred and the following data were obtained.
The author drilled a hole in a die and filled it with a lead weight, then proceeded to roll it 180 times. (Yes, the author has too much free time.)
Perform a Chi-Square Goodness of Fit (GOF) test to determine whether there is a difference between the observed values versus the expected values expected
In a three-digit lottery, each of the three digits is supposed to have the same probability of occurrence