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In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each type were crashed, with the results shown below. Research question: Are the mean crash damages the same for these three vehicles? State the decision rule for α = .05 and make the decision. Interpret the p-value.
Goliath Varmint Weasel
1,660 1,290 1,090
760 1,400 2,100
880 1,390 1,830
1,950 1,850 1,250
1,220 950 1,920
A hypothesis test is to be used to help determine if there is a difference between the proportion of 2 year college students and private university students that work at least 20 hours per week.
Four percent of the customers of a store buy cigars. Half of the customers who buy cigars buy beer and one fourth of those who buy beer buy cigars. The table is given below:
Given are the numbers of times the machine was used over each of the last 30 days. Find out the mean number of times the machine was used per day.
Find the probability of accepting a lot as a function of the actual fraction of defective chips. In particular, let the actual fraction of defective chips in a given lot equal any of 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14, 0.16, 0.18. Then compu..
Critically discuss the relationship between a sample and the type of population it is taken from? What population factors should be taken into consideration?
A machine fills containers with a mean weight per container of 16oz. If no more than 5% of the containers are to weigh less than 15.8oz, what must the standard deviation of weights equal?
What is the chance that stock will fall by more than 15% next month? What extra assumption are you making when replying this question?
A. What is the 90% confidence interval for the daily sales at all restaurants. B. What is the probability that the average sales are really $32,000 or more per day? Assume that the population average is $30,000 per day and the std. Deviation is $2..
Normal distribution has mean of 80 and standard deviation of 14. Find out the value above which 80 percent of values will occur.
The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable-one three digit number wins $600 and all others win nothing-that gamblers never reach "the long run".
This morning the office you are monitoring has eight office visits on the schedule. What is the probability that
Describe your answer to a person who has never had a course in statistics.
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