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What is the importance of the null hypothesis? Why has it been the backbone of mainstream hypothesis testing for decades? What are its limitations?
Please provide references.
Shows a sample mean of 1,261 with a standard deviation of 59. Should Pennsylvania adopt the new system for all toll roads in the state?
Stores A, B, and C, have 50, 75, and 100 employees and respectively 50%, 60%, and 70% if these employees are women. Resignations are equally likely among all employees regardless of sex. One employee resigns and she is a woman. What is the probabi..
Suppose that 98% of the customers in your market have Internet access, and you select a random sample of 500 customers. What is the probability that the sample has:
If statistically significant, do you believe the difference is large enough to be significant? If so, to whom, and explain why? Is normality assumption fulfilled? Describe.
For patients over age 80, probability is 0.05 that coronary bypass patient will die soon after surgery, if hospital performs eight such operations, determine the probability of two or more fatalities?
One approach for defining elevated blood pressure is to use 90 mm Hg- the standard for elevated adult DBP- as the cutoff. What percentage of 17-year-old-boys would be found to have elevated blood pressure, using this approach?
What is the relationship between confidence intervals and hypothesis testing? How are they the same? How are they different?
The sample mean of the sampling distribution of a statistic is 6 and the standard error of the statistic is 1.03. What is the probability that xbar > 7.52?
Machine X test unit cost $3000 with beta=3 and theta=500, Machine Y test unit cost $2000 with beta=3 and theta=400. If the machines oil fixtures has life of 20 hrs, which machine goes to market first?
Confirm that these statements are accurate by finding the geometric mean rate of increase.
State the correct decision and give justification for your decision.
Find the t c for a 90% confidence level with a sample size of 18.
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