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QUESTION: A company union claims that the mean number of hours all employees work per week is more than 45. From a sample of 32 employees, the mean number of hours worked per week was 48 and the standard deviation was 10.8 hours. Assume the population is normally distributed. At ???? = .01, is there enough evidence to support the union's claim?
QUESTION: The population of all verbal GRE scores are known to have a standard deviation of 8.5. The PSU Psychology department claims its applicants have an verbal GRE scores of 210. This year, the mean verbal GRE scores for the 42 applicants was 212.79. Using a value of α = 0.05 is there evidence that the mean verbal GRE score is not 210?
Data on dating A student wonders if tall women tend to date taller men than do short women. She measures herself, her dormitory roommate.
When we test a simple null hypothesis against a composite alternative, a critical region is said to be unbiased if the corresponding power function takes on its minimum value at the value of the parameter assumed under the null hypothesis.
Draw a stem-and-leaf plot of these data.- Draw a histogram of these data.- Characterize the shape of the data.
a b c and d are taking goal shots in soccer. they take shots in the order a b c d then repeat. by going in this order
If we consider this equation as relating temperatures of water in its liquid state, what are the domain and range?
Comment on the ability of the emergency service unit to meet the desirable goal, assuming normality. What are some possible actions to consider?
find the percentage of such males that weigh between 190 and 210 lb. (Note: Make sure you choose the flag value closest to 190 and 210.) Give the proportion as a decimal rounded to thousandths.
Trevor is interested in purchasing the local hardware/sporting goods in the small town of Dove creek, Montana. After examing accounting records for the past several years
Draw and label the Normal model.- Would it be safe to use these rivets in a situation requiring a shear strength of 750 pounds? Explain.
Why women and men play sports. Do the data provide convincing evidence of a difference in the distributions of sports goals for male and female undergraduates.
What kind of information would you like to know about the background of this statement before you would consider it to be reliable?
The city council of a particular city is composed of five members of party A, four members of party B, and three independents.
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