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Births. Randomly selected births records were obtained and results are listed in the table below (based on data from the National Vital statistics Report, Vol. 49, No.1). Use a 0.05 significance level to test the reasonable claim that births occur with equal frequency on the different days of the week. How might the apparent lower frequencies on Saturday and Sunday be explained?
Day Sunday Monday Tues Wed Thurs Fri Sat
Births 36 55 62 60 60 58 48
Assume that you go to the drive through window at Wendy's and place an order. Two friends of yours independently place orders at the drive through window at the same Wendy's.
Using the z table in Table E of Appendix C, what are the critical values for a two-tailed test when a = 0.03 .
Assume that stock is currently selling for $100. The change in the stock's price throughout the nest year follows a normal random variable with a mean of $10 and a standard deviation of $20.
Hours worked is important predictor of amount of sales.
Fitting of multiple linear regression equation - Give a list of the model assumptions for a regression model.
A run chart is developed that confirms process stability. The level of significance is chosen to be 0.01. (a) Is there evidence to suggest that the process average differs from the target value?
What is an example of two variables that are likely to be correlated because they are both changing over time?
Replacement times for new Ford Taurus GL automobiles are normally distributed with a mean of 7.1 years and a standard deviation of 1.4 years.
Determine the mean and standard deviation of the data. What percentage of the data lies within one standard deviation of the mean value?
Would one make clear (summarize) the differences between the following and when they are used or what they are applied to.
What is the probability that the contaminated can is selected for testing?
Compute the range, variance, standard deviation, and coefficient of variation. Compute the Z scores. Are there any outliers?
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