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Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages.
a) At the .01 level of significance, is the true mean greater than 10?
b) Use Excel to find the right-tail p-value.
Black Hole Pizza Parlor instructs its cooks to put a "handful" of cheese on each large pizza. A random sample of six such handfuls were weighed.
Suppose that a model for the joint distribution of these rvs is a bivariate normal distribution.
Between what two values does the P -value of this test fall?
Find the standard error of the difference in sample means,
What is the relationship between the variance and the standard deviation?
The incubation time for Rhode Island Red chicks is normally distributed with a mean of 21 days and standard deviation of approximately 1 day.
Use a decision tree to describe the possible strategies and the consequences (or payoffs) of each. Show your decision tree.
Determine the pairs which are significant according to LSD and what pairs are important according to Bonferroni?
Research question : At α = . 05, is cockpit noise level independent of flight phase?
Find out the forecast value utilizing three month moving average method, weighted moving average method, exponential smoothing and regression methods.
When is it important to have matched pairs rather than two independent sets of data?
If the sample standard deviation of the sample was $630 also the sample size was 50. Findout the 90% confidence interval of true mean.
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