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The average age for all medicare patients in the USA is 75. A sample from a clinic shows that the average age of the clnic medicare patients is 78.
a. What are the null and alternative hypotheses to test if the average age of the clinic mediare patients is significantly different from the national aveage?
b. Suppose you find that the z= 2.05. What conclusions should you draw for alpha=0.05? (Critical value for z= 1.96 and alpha=0.05 and z=2.576 for alpha=0.01)
c. What conclusions should you draw for alpha = 0.01 (for z=2.05)?
Create a scatter plot for those data. Based on scatter plot, how would you explain relationship between the two variable.
A company that produces an expensive stereo component is considering offering a warranty on the component. Suppose the population of lifetimes of the components is a normal distribution with mean of 84 months and standard deviation of 10 months.
Mean and standard deviation are 584.6 and 34.28
Do 1-sample t-test to see if people in Chicago have travelled to fewer states than people nationwide. Utilize the 10% (.10) level of significance.
Twenty air samples were obtained and the carbon monoxide concentrations were recorded. the results in ppm (parts per million) were:
The number of traffic accidents that occurs on particular stretch roas during a month follows a Poisson distribution with mean of 8.5. Find the probability of observing exactly three accidents of this stretch of road next month.
Time spent using e-mail per session is normally distributed, with μ = 8 minutes, and σ = 2 minutes. If you select a random sample of 25 sessions,
If statistically significant, do you think the difference is large enough to be important?
Test hypothesis that annual incomes of corporate trainers in areas of more than 500,000 are considerably more than those in areas of less than 100,000. Make use of the 5% level of risk.
If you are told a population has a mean of 25 and a variance of 0, what must you conclude? a) Someone has made a mistake. b) There is only one element in the population.
You have an observed mean of 55, an observed standard deviation of 12. Which Z value is associated with each raw score below?
The university policy department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows a Poisson distribution with mean of 6.5 tickets per day. Interpret ..
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