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1. The sampling distribution of the ratio of two independent sample variances taken from normal populations with equal variances is:
A. an F distribution
B. a chi-square distribution
C. a t distribution
D. a normal distribution
2. A sample of n observations is taken from a population. When performing statistical inference about a population variance, the appropriate chi-square distribution has:
A. n degrees of freedom
B. n - 1 degrees of freedom
C. n - 2 degrees of freedom
D. n - 3 degrees of freedom
Test the claim that for the adult population of one town, the mean annual salary is given by μ = $30,000.
We want to estimate the population mean within 5, with a 99% confidence level. The population std dev is estimated to be 15. How large is the required sample size?
What are the two ways of testing a correlation coefficient for significance?
We are establishing a quality control program for a process and need to establish the mean and standard deviation for the process. The first 10 batches had samples of size 5 taken.
An advantage of the permutation test over the t test for a difference in means, can Permutation tests be used for tests when we believe the two populations differ under the null hypothesis.
The following estimated regression model was developed relating yearly income (Y in $1,000s) of 30 individuals with their age (X 1 ) and their gender (X 2 ) (0 if male and 1 if female).
Find the relative risk for moderate beer drinkers as compared to nondrinkers, finds the 95% confidence interval
Enter data into SPSS (use two columns: one for coding {0, 1, 2, 3, 4, 5} and one for DV)
By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.
Compute the range and interquartile range
If they must form an ethics subcommittee of 4 members, how many different subcommittees are possible?
Which of the following is the correct set of probabilities for X and if a student is selected at random, the probability he or she is either a Junior or a Senior
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