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Merrill Lynch Securities and Health Care Retirement Inc. are two large employers in downtown Toledo, Ohio. They are considering jointly offering child care for their employees. As a part of the feasibility study, they wish to estimate the mean weekly child-care cost of their employees. A sample of 10 employees who use child care reveals the following amounts spent last week.
107 92 97 95 105 101 91 99 95 104
Develop a 90 percent confidence interval for the population mean. Interpret the result.
Multiple choices based on regression analysis - the percentage of variation in the dependent variable explained by the variation in the independent variable
Estimating the combined mean values for the given data - find the mean for the combined sample
Estimate and interpret the p-value of the calculated test statistic above.
When is regression used? What are the assumptions of Linear Regression? What is correlation? How does it differ from regression? What is the interpretation of the correlation coefficient?
A record executive is interested in the popularity of her label's newest band, The Standard Deviations. She asks 10 people how many Standard Deviations songs they know.
In a large western university, 15% of the students are graduate students. If a random sample of 20 students is selected, what is the probability that the sample contains:
Is there evidence of difference in median performance between two methods? (Use α = 0.05.)
You took the standard deviation of 4.5 minutes from a commuting friend and believe that that is the standard deviation for the area. Prepare a 95% confidence interval for the true average commuting time.
What statement can you made by using the rule of three, about the proportion p, of all its computers which are defective?
Descriptive statistics for given data - Evaluate the range, variance, and standard deviation of the data set. Interpret the results in the context of the real-life setting.
This distribution is positively skewed. The standard deviation of the population is not known.
Suppose the inspector is unhappy with the previous result and would like to resample. How many rolls should be sampled to estimate the mean tensile strength within 1.5 PSI with 95% confidence?
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