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Below are randomly selected passenger car and taxi ages from a large city. Use the Wilcoxin Rank Sum test for independent samples to determine if the median age of a car and a taxi are different.
CARS: 4 0 8 11 14 3 4 4 3 5 8 3 3 7 4 6 6 1 8 2 15 11 4 1 6 1 8
TAXI: 8 8 0 3 8 4 3 3 6 11 7 7 6 9 5 10 8 4 3 4
Is there any statistically significant difference in how the drugs perform? If so, explain the effect. Use the post hoc tests as needed.
Develop a p chart with 3-sigma control limits and evaluate whether the process is in statistical control
A real estate company wants to study the relationship between house sales prices and some important predictors of sales prices. Based on data from recently sold homes in the area, the variables
Indicate your hypotheses, decision rule, statistical decision and management conclusion using the critical value and then find the p-value and state your decision rule, statistical decision and management conclusion using this method.
Your supervisor has asked you to conduct a survey about consumers' buying habits. For this task, you surveyed 100 men and 100 women at a local shopping mall.
Prediction equation is y^ = 30 + 0:60x. Determine predicted final exam score for student who has (i) midterm score = 100, (ii) midterm score = 50. Note that predicted nal exam score regresses toward mean.
Identify the scale of measurement in each of the following:
If you have a population that has a small sample, but does not meet all of the criteria for the nonparametric test how can you tell what test to use?
Assume you always reject null hypothesis, regardless of any sample evidence. Determine the probabiliyt of Type II error? P(Type II error).
There is evidence that the two processes yield different average errors. Assume that the population standard deviations are equal. What is the degrees of freedom?
What is the Bonferroni adjustment? What would the Bonferroni adjustment be for a study with four groups for which a researcher decided to use t-tests?
If hypothesis test for single population variance is to be conducted by using significance level of to 0.10, a sample size of n = 16, and test is a one-tailed upper-tail test, the critical value is?
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