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Your director has banned the use of all artificial fingernails, claiming their use contributes to patient infections in the unit. After multiple discussions the director has allowed you to do a research study to determine if the use of artificial fingernails causes increases in infection rates. You would really like to prove that their use does not contribute to infection rates. Without worrying about the research design in this case, or even how you might research it, state
1. The null and alternate that you might use.
2. What alpha you might use and why
3. What rejecting the null would mean
4. What failing to reject the null would mean
5. What a type I error is in this case and the consequences of it?
6. What a type II error is in this case and the consequences
7. Which error is more important in this case.
A software company wants to determine whether there is a relationship between their three sales offices and the sales of their software products. The actual sales results are
Which of the variables below do you think will be roughly normally distributed? Please select all that apply.
For each of the following three scenarios, state which hypothesis test you would use from among the four introduced so far: the z test, the single-sample t test, the paired-samples t test, and the independent-samples t test.
According to a report produced by the New South Wales Ministry of Health, 46% of hospitalisations occur in people aged sixty years and over (60+).
A bank's loan officer rates applicants for credit. The ratings can be described by a Normal model with a mean of 200 and a standard deviation of 50.
An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pre-test, then participates in six sessions using the tutor, then i..
Why do we use graphical displays of the data from our research, such as Pareto Charts, Bar Charts, Pie Charts, Flow Charts, or Process Control Charts?
Suppose that X1,..,Xn form a random sample from the normal distribution with unknown mean M and unknown standard deviation S, and let m and s denote the MLEs of M and S. for the sample size n=17, find a value of k such that P(m > M +ks) = 0.95
The chi-square goodness of fit is______________a one-tailed test with the rejection region in the right tail.
Calculate the mean number and median number of apples in a bag.
Our decisions depend on how the options are presented to us. Here's an experiment that illustrates this phenomenon. Tell 20 subjects that they have been given $50 but can't keep it all.
a. How many of the individuals selected in your sample are female? b. How is the stratified sample different from the SRS?
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