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A certain brand of flat white interior latex paint claims one-coat coverage of 400 square feet per gallon. The standard deviation is known to be 20. A sample of 16 gallons is tested. (a) At α = .05 in a left-sided test, find the β risk and power assuming that the true mean is really 380 square feet per gallon. (b) Construct a left-sided power curve, using increments of 5 square feet (400, 395, 390, 385, 380).
Write down the probability of that the median of the sample or average medians is greater or more than 320 minutes?
Name six virtues and characteristics of problems and hypothesis. Name some tips for identifying and developing formal research problems.
Will the distribution of x bar always be approximately normally distributed, or does it depend on the distribution of the population?
What is the difference between a sample and a population? When can the same information (e.g. the age of each of the ten students in our class) be considered both sample data and population data?
Dr. Richmond, a psychologist, is studying the daytime television viewing habits of college students.
Solve the problem: According to police sources a car with a certain protection system will be recovered 94% of the time. Find the probability that 4 of 8 stolen cars will be recovered.
A random sample of 40 part time workers has a mean annual earnings of $3120 and a population standard deviation of $677. Compute the 95% confidence interval for the mean.
What are the primary differences between investments in corporate stock versus corporate bonds? Since bonds pay interest, does that imply the individuals risk exposure is less for investing in bonds rather than stock?
Use this information to find the probability that an HRO officer selected from the group surveyed had problems with either employee absenteeism or employee turnover.
What statistical method is used to accept or reject the null hypothesis in determining if outsourcing is always beneficial? Please explain your reasons for choosing the selected method in detail and cite references (if any).
The time to complete a construction project is normally distributed with a mean of 60 weeks and a standard deviation of 4 weeks. What is the probability the project will take longer than 65 weeks?
The trial failed to show significance. How many subjects would be required to detect the difference in proportions observed in the trial with 80% power?
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