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A hospital conducted a study of the waiting times in its emergency room at the main campus and three offsite locations. Studying only cases that did not require immediate attention, random samples of 15 were taken at each location on a particular day. The waiting times (from check-in to clinic visit) were measured with the results stored in ER Waiting.
a) At the 0.05 level of significance, is there evidence of a difference in the mean waiting times in the four locations? State your null and alternative hypotheses. (Note: while the small sample size could justify use of the non- parametric Kruskal-Wallis rank test, assume normality and use the ANOVA test.
b) Use the Tukey-Kramer procedure tom see which ones are different.
Determine the probability of choosing the area code at random which ends in the odd number if first digit cannot be 1 or 0?
One characteristic of billiard balls is their elasticity - the bounce they get when striking one another. A manufacturer of billiard balls is testing three additives to the basic plastic.
Answer the following three questions based on what you know about statistics now.
Z score on comparison distribution for sample score and your conclusion. Suppose that all population are normally distributed.
Do not forget to test for any applicable difference in means (Tukey implies).
If the packets are sold in multi-packs containing six packets, what is the distribution of the number of prizes in a randomly chosen multi-pack?
Also include information about the number of participants you would assess and how you would go about estimating effect size and statistical power (when relevant).
The proportion of parts in an inventory that are outdated and no longer useful is thought to be 0.10. To check this, a random sample of n = 100 parts is selected and 14 are found to be outdated. Based upon this information, what is the probability..
If the payoff from outcome A is twice the payoff from outcome B, then the ratio of these utilities will be.
On average, the size of the difference between the sample mean and the population mean is predicted by:
What is the probability of randomly selecting a male from this group?
For sample of size 100, what is the mean and standard deviation of the sample mean.
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