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The owner of a local supermarket wants to estimate the difference between the average number of gallons of milk sold per day on weekdays and weekends. The owner samples 20 weekdays and finds an average of 265.551 gallons of milk sold on those days with a standard deviation of 36.4693. 24 (total) Saturdays and Sundays are sampled and the average number of gallons sold is 370.357 with a standard deviation of 48.9046. Construct a 90% confidence interval to estimate the difference of (average number of gallons sold on weekdays - average number of gallons sold on weekends). Assume the population standard deviations are the same for both weekdays and weekends.
1) (-126.578, -83.034)
2) (-127.07, -82.542)
3) (-126.487, -83.125)
4) We only have the sample means, we need to know the population means in order to calculate a confidence interval.
How does the efficiency of a regression predict the power of the t-test? How do robust standard errors change the comparison between hypothesis testing using OLS and robust regression? What does dependence in the e do to the t-test? what does non-no..
The average score on the stat midterm was 75 points with a standard deviation of 5 points, and Gregor's z-score was -2. How many points did he score.
Construct appropriate control charts for before and after introduction of the new pathway. Discuss process stability and the results.
Which of the given experiments can be modelled by Poisson distribution?
Woodco manufactures tables and chairs. Each table and chair must be made entirely out of oak or entirely out of pine. A total of 150 board feet of oak and 210 board feet of pine are available.
A gender selection method is effective in helping couples have baby girls, and among 45 babies, 24 are girls. Create subjective estimates to conclude that the evidence does support the claim or that the evidence does not support the claim. Use the..
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
What is the probability that a cereal would be high calorie, given that it is high fiber? In other words, what is P (high calorie, given high fiber)?
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
Provide a brief description of the main features of these data from the scatter plot and Describe why you would use performance as the predictor variable and performane related pay as the dependent variable in such a model.
Variance of 4.2 and mean of 23.2 were calculated. Find out 95% confidence interval on mean and standard deviation. Describe any potential problems with this analysis.
Bicycle helmet use. Table lists data from a cross-sectional survey of bicycle safety. The explanatory variable is a measure of neighbourhood socioeconomic status (variable_RFM). The response variable is "percent of bicycle riders wearing a helmet"..
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