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The mean annual cost of automobile insurance is 939 assume that the standard deviation is 245. a) what is the probability that a simple random sample of automobile insurance polocies will have a sample mean within 25 of the popluation mean for each of the following sample sizes 30,50,100, and 400?
Suppose B^0 and B^1(beta hut 0 and beta hut 1) are the least squares estimates of B0 and B1 of the first model. Find the estimates of B0* and B1* in terms of B^0 and B^1.
The annual demand for a product is 1,000 units. The company orders 200 units each time an order is placed. The lead-time is 6 days, and the company has determined that 20 unites should be held as a safety stock.
Consider a random sample of size n from an exponential distribution, Xi ~ EXP(1,eta). a) Show that Q = X1:n - eta is a pivotal quantity and find its distribution.
Determine the confidence level used for the given confidence interval.
Out of 1000 randomly selected people at the DMV, about how many would be expected to have to wait i) between 26.4 and 32.8 minutes? ii) longer than 39.2 minutes.
What is their maximum error of the estimated mean quality for a 92% level of confidence and an estimated standard deviation of 8?
Xerox Claims their copier is the same speed as Cannon's copier. The average speed of cannon's copier is 27 copies per minute. A test of 49 runs is done on the Xerox copier giving a sample mean X = 26 and a sample standard deviation s = 2.65.
Consider the following number of defective circuit boards produced by two different machines on seven randomly selected days. To three decimel places what is the mean of machine A?
Does the variability in output appear to differ at the two experience levels? Test the hypotheses at the .05 significance level.
Assume the distribution of the length of the cuts follows a normal distribution with a standard deviation of 8 seconds. Suppose we select a sample of 16 cuts from various CDs sold by CRA CD's Inc. What can we say about the shape of the distributio..
Construct a 95 percent confidence interval for the difference in proportions for the two populations represented by these samples.
For each of the following three scenarios, state which hypothesis test you would use from among the four introduced so far: the z test, the single-sample t test, the paired-samples t test, and the independent-samples t test.
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