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As part of a study of corporate employees, the director of human resources for PNC Inc. wants to compare the distance traveled to work by employees at its office on downtown Cincinnati with the distance for those in downtown Pittsburgh. A sample of 35 Cincinnati employees showed they travel a mean of 370 miles per month. A sample of 40 Pittsburgh employees showed they travel a mean of 380 miles per month. The population standard deviations for the Cincinnati and Pittsburgh employees are 30 and 26 miles, respectively. At the 0.05 significant level, is there a difference in the mean number of miles traveled per month between Cincinnati and Pittsburgh employees?
a. Is this a one-tail or two- tailed test?
b. State the decision rule. (Negative values should be indicated by a minus sign. Round your answers to 2 decimal places.)
The decision rule is to reject Ho: Cincinnati = Pittsburgh if Z is __Outside__ the interval (________, _________)
weights of pacific yellowfin tuna follow a normal distribution with mean weight 68 lb and standard deviation 12 lb. a
Compare that number with the actual value. Create a frequency distribution of miles since mainte¬nance cost. Is the distribution normally distributed
1.a poll finds that 54 of the 600 people polled favor the incumbent. shortly after the poll is taken it is disclosed
1. What is the value for n, the total number of observed sample values? 2. How many degrees of freedom do we have in this hypothesis test? 3. What is the observed frequency O for the White/non-Hispanic category?
Let X be an Erlang random variable with PDF, --- Derive a saddle point approximation for the left tail probability.
the distribution of the sum of independent n? ?2 random variables isa. always approximately normalb. always exactly
What is the probability of getting an ace or a club on a single pick from a well-shu?ed standard deck of cards?
the p-value for a two tail test of hypothesis is 0.014. what is the p-value for the corresponding one tail
Explain what this means. Would she reject the null? hypothesis? Why?
Draw a picture of the appropriate sampling distribution, and show where the value x‾1 - x‾2 = 2 falls on it.- Find the value of the standardized statistic corresponding to x‾1 - x‾2 = 2.
Calculate the 95% confidence interval for the mean IQ of Missourians.
TAX PREPARATION A survey in which people were asked how they were planning to prepare their taxes in 2007 revealed the following.
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