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A director of a social agency is planning to hire temporaty staff to assist with intake. In making plans, the director needs to know whether there is any difference in the use of he agency at different seasons of the year. Last year there were 28 new clients in the winter, 33 in the spring, 16 in the summer, and 51 in the fall. On the basis of last year's data, should the director conclude that season make a difference? (use the .05level.) Explain your answer to a person wo has never taken a course in statistics. (this problem is like the Harter et al. example in which you are doing a chi square for a single nominal variable. It is not a chi-square test for independence and does not involve any contingency tables.
Ten different people's income tax returns are done by each of the three software packages and the time is recorded for each. Which of the following is true?
Convert these four officers' scores to standardized z-values.Do you believe there was adequate reason to question these four exam scores? What suppositions are you making?
For a sample of 138 independent observations from a normal distribution of unknown μ and variance σ 2 = 2.6, the sample mean is 52.3. What is the width of the 95% confidence interval for μ?
What is the distinction between distribution-free methods and nonparametric methods?
Define the variable - the weight in pounds - it is a dependent variable. Find the mean, median, mode, variance, and standard deviation for your data.
Provided an example of a research problem at any organization that would benefit from the employ of either descriptive statistics or probability distribution statistics.
If the sample mean lifetime of the 100 batteries were 36.7 hours. would you find the manufacturer's claim plausible? Explain.
A function sometimes associated with a continuous nonnegative random variable is the failure rate (or hazard rate) function which is defined as:
If the trash ag manufacturer hopes to obtain a sample mean that is at least 50 pounds which sample size n=5 or n=40 would be best.
What additional information is obtained from measurements on an ordinal scale compared to measurements on a nominal scale?
Quality control studies for Leaky Jet Computer Printers show the lifetime of the printer follows a normal distribution with a mean of 4.5 years and a standard deviation of 0.85 years.
If one employee is randomly selected, find the decimal probability (four decimal places) that his/her commute takes the following amount of time.
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