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Last year, there were 30,000 students at a university; their GPA had a mean of 2.9 and an SD of 0.6. This year, in a simple random sample of 100 students taken from this university, the GPAs have a mean of 2.95 and an SD of 0.55. Has the mean GPA at the university gone up since last year, or is this just chance variation.
Conduct a 3-period moving average, an exponential smoothing forecasting using an alpha of .25, and a seasonal forecast with 3 seasons.
ACT scores of high school seniors. The scores of high school seniors on the ACT college entrance examination in 2003 had mean JL = 20.80 and standard deviation (J = 4.80. The distribution of scores is only roughly Normal.
What is the best estimate of the average tread life for the entire population of these tires?
14 machines are planned to be used for a 60-day production run for a customer. The operating time is 1660 hours. Upon failure, a machine must be returned to the manufacturer for repair.
The average age of the students in the sample was 23 with a standard deviation of 3.5: a) Formulate the hypotheses for this problem.
Find out 90% confidence interval for mean grade of all the students in the class.
Statistical Hypothesis testing - Frequency distribution
Write the regression equation approximately. Computed the coefficient of determination(r 2 ).
Create Gantt chart using MSP. Suppose the 5 day workweek, compute critical path of the project.
Supposing a linear relationship, use the least squares method to find the regression coefficients b 0 and b 1 .
Fit a multiple linear regression model for predicting the hospital duration using age, sex, body temperature, white blood cell counts, antibiotic use, blood culture and service
Illustrate that probability distribution of X satisfies properties of a discrete probability distribution.
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