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The Boston Transit Authority wants to determine whether there is any need for changes in the frequency of service over certain bus routes. The transit authority needs to know whether the frequency of service should increase, decrease, or remain the same. The transit authority determined that if the average number of miles traveled by bus over the routes in question by all residents of a given area is about 5 per day, then no change will be necessary. If the average number of miles traveled per person per day is either more than 5 or less than 5, then changes in service may be necessary.
The authority wants, therefore, to test the null hypothesis that the average number of miles traveled per person per day is 5.0 versus the alternative hypothesis that the average is not 5.0 miles.
The required level of signi?cance for this test is a = 0.05. A random sample of 120 residents of the area is taken, and the sample mean is found to be 2.3 miles per resident per day and the sample standard deviation 1.5 miles. Advise the authority on what should be done. Explain your recommendation. Could you state the same result at different levels of signi?cance? Explain.
Historical data suggests a standard deviation in the first sample of 10 and a standard deviation in the second sample of 16. Find a 95% confidence interval for the population difference.
tim gets 15 emails on average per day i.e. per 24 hours. emails arrive randomly and independently.a what is probability
1.i have fit a line to data representing cholesterol readings for 28 individuals starting a cholesterol reducing drug.
Death would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excessive?
What kind of probability uses sample spaces to find out numerical probability that event will happen?
Make a List of type of possible errors. Assume that you were interested in knowing the mean score for a certain quiz in a statistics class.
Can the human resource manager conclude, at the 5% significance level, that the job enrichment workshops increase sales consultants' job satisfaction levels? Present your findings to the human resource manager.
Convert the binary response variable to a 0/1 continuous response and try some of the standard smoothing methods, such a spline fit to investigate the general form of the response. Does it look logistic?
Assume the probability of a tire blowout is 0.178% per 50,000 miles of use and that a person travels 15,000 miles per year in a car.
(a) What is the average number of customers in the shop? (b) What is the proportion of potential customers that enter the shop? (c) If the barber could work twice as fast, how much more business would he do?
Find the test value for the difference in the proportion of employees who were ever late for work in the past year.
The rate of service calls per month was researched yielding the following results (no of service calls divided by the number of equipment): Do these data indicate that the program is effective?
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