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Cholesterol levels are measured for 28 heart attack patients (2 days after their attacks) and 30 other hospital patients who did not have a heart attack. For the 28 heart attack patients, the mean cholesterol level was 253.9 with a standard deviation of 47.7. For the 30 other hospital patients who did not have a heart attack, the mean cholesterol level was 193.1 with a standard deviation of 22.3. At the 0.05 significance level, is the cholesterol level higher for the heart attack patients?
The events A and B are independent, mutually exclusive or both. If two events A and B are mutually exclusive (A B = ), then they cannot be independent if P(A) > 0 and P(B) > 0. Why?
Produce the scatter plot for x3 and y3. Do you think there are any outliers?Calculate the correlation coefficient (r) for all the data points What does the p-value in your SPSS output tell you?
in a study of facial behavior people in a control group are times for eye contact in a 5-minute period. their times are
Your task is to interview a representative sample of attendees for the large concert venue where you work. The new season includes 200 live concerts featuring all types of musicians and musical groups.
the project requires you to use the statistical techniques learned in this class. you may make up data as you like
a rapid test for the presence in the blood of antibodies to hiv the virus that causes aids gives a positive result with
Derive an expres- sion (involving p) for the probability that exactly one tag is lost given that at most one is lost ( Ear Tag Loss in Red Foxes, J. Wildlife Manag., 1976: 164-167). (Hint: Draw a tree diagram in which the two initial branches refe..
a normally distributed random variable y has std dev. 800. a random sample of 100 observations was taken from y and
we know many types of data fall into a normal distribution with most of the observations falling towards the middle.
How would you gather your data? What would you use to validate your forecasting model? Would you look at the forecasting errors? What program would you use to make your forecast (i.e. Excel or Excel QM)
Of 900 consumers surveyed, 414 said they were very enthusiastic about a new home decor scheme. What is the 99% confidence interval for the population proportion?
directions answer each of the following questions. show your work or explain how you arrived at your conclusion
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