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Childbirth, part 2. In Exercise 13, the table shows results of a study investigating whether aftereffects of epidurals administered during childbirth might interfere with successful breastfeeding. We're planning to do a chisquare test.a) How many degrees of freedom are there?b) The smallest expected count will be in the epidural/ no breastfeeding cell. What is it?c) Check the assumptions and conditions for inference.
Childbirth, part 1. There is some concern that if a woman has an epidural to reduce pain during childbirth, the drug can get into the baby s bloodstream, making the baby sleepier and less willing to breastfeed. In December 2006, the International Breastfeeding Journal published results of a study conducted at Sydney University. Researchers followed up on 1178 births, noting whether the mother had an epidural and whether the baby was still nursing after 6 months. Results are summarized in the table.
a) What kind of test would be appropriate?b) State the null and alternative hypotheses.
The Sentry Lock Corporation manufactures a popular commercial security lock at plans in Macon, Louisville, Detroit, and Phoenix. The per unit cost of production at each plant is $35.5, $37.5, $39, and $36.25, respectively, while the annual product..
Select a quantitative dependent variable and at least three variables for a multiple regression; at least one of your indvars must be a dummy variable. Be sure to carefully evaluate how all of your variables are measured
Discuss the characteristics of a good research hypothesis. What distinguishes a null hypothesis from a research hypothesis? How would you explain the difference between non-directional research and directional research hypothesis?
Using a 1% level of significance, can we say that there is a difference in the average waiting time between the two shops? Find the critical value(s).
Start the car! In October 2002, Consumer Reports listed the price (in dollars) and power (in cold cranking amps) of auto batteries.
For each of the following parametric tests, identify the appropriate non-parametric counterpart: This problem belongs to Statistics and it discusses about identifying appropriate non-parametric counter parts for various tests
I want to know whether the StdError of the fitted score (SEYhat) can be legitimately interpreted normally for N=1 subject, with only one plotted Y score for each X value.
Gas Station pump signs, at one chain, encourage customers to have their oil checked, claiming that one out of every four cars should have its oil topped.
Calculate the following percentages for a z score of 0.74, with a tail of 22.96%: What percentage of scores falls between the mean and this z score?
Green versus yellow. Using the Minitab output in Figure 29.4, verify the values for the sample contrast 2 and its standard error given in Example 29.7. Give a 95% confidence interval for the population contrast L2.
What are examples of variables that follow a binomial probability distribution? What are examples of variables that follow a Poisson distribution? When might you use a geometric probability?
In all, n = 100 bottles were tested. Give two transformations that are suitable transformations to try that might achieve a distribution somewhat closer.
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