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Compute the correlation and sample covariance.
A data set contains the height (Y1) and the volume (Y2) of 3 black berry trees, and the observations are (75; 18.2); (80; 22.6); (75; 19.9):
1. Intuitively, what kind of correlation between Y1 and Y2 do you expect? Positive, negative or zero?
2. Compute the sample covariance and the sample correlation.
Employees of a local university have been classified according to gender and job type. The following table provides data about the employees.
Compute the range and interquartile range
What is the probability that a randomly chosen eight-week old baby smiles between 2 and 18 seconds?
A researcher has a series of Likert-scale items and a measure of frequency of absenteeism. He uses each of the Likert-scaled items in a separate bivariate correlation with absenteeism without testing for the assumptions of linear relationships. Is th..
Compute average daily rainfall in the week and for weekends. Get the average of weekdays' rainfalls and average of weekend's rainfalls.
P-value to test hypotheses,
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p-value.
At the .05 significance level, is there a difference in the mean number of miles traveled per month between Cincinnati and Pittsburgh employees? Use the five-step hypothesis-testing procedure.
Do you benefit by using a cum sum chart rather than a control chart?
where p is the binomial probability of returning a completed survey, and log is the natural logarithm. The multiple logistic regression output from fitting this model is given below.
Why is cumulative relative frequency distribution so much more informative that just relative frequency distribution? Use examples to explain these differences.
What is the 95% confidence interval for the difference between the mean prices of the two models?
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