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Price scanners at O-mart are supposed to produce no more than 2% errors. Is this under-stated? We randomly sample n=1000 scans and find 28 of the scans produce an incorrect price. Test the problem above use significance level 0.05
(a) Write down H0 and Ha
(b) What's the unbiased point estimate of the parameter to be tested?
(c) Find the proper test statistic and compute the (observed) value for it based on our sample;
(d) What's the Rejection Region (rule) based on the test statistic and what's your decision?
(e) Find the P-value and make a decision with your P-value;
(f) Confirm that all the conditions are satisfied to use the large sample test procedure above.
A sample of 50 bottles reveals a mean weight of 502.1 ml. Construct and interpret a 90% confidence interval for the mean. Be sure to interpret the meaning of this interval.
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What would be the most appropriate graphical representation to show the dispersion of new home prices in a particular area? Why?
the following observations show the number of traffic violations given for speeding on the one interstate highway going
Suppose that the probability is 1 in 3,900,000 that a single auto trip in the U.S. would result in the death of the driver. Over a lifetime, an average U.S. driver takes 50,000 trips.
Conduct the hypothesis test and provide the test statistic, critical value and/or P- value and state the conclusion.
consider a poisson probability distribution in a process with an average of 3 flaws every 100 feet. find the
when a certain manufacturing process is correctly adjusted the length of a machine part produced is a random variable
How many participants need to be enrolled in each group to have a 90% chance of detecting a significant difference using a two sided test with α =0.05 if compliance is perfect?
Discuss three measures of central tendency for the dependent variable. Is this distribution skewed? If so, in what direction? Explain your answer. Why would you NOT attempt to determine the central tendency of the independent variables?
question there is some evidence that rem sleep associated with dreaming may also play a role in learning and memory
What are the five steps in the hypothesis testing procedure, what does each step represent, what are the advantages and disadvantages of using a hypothesis testing procedure?
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