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A consumer advocacy group wants to determine whether there is a difference between proportions of the two leading automobile models that need major repairs within 2 years of purchase. A sample of 400 two-year owners of model 1 is contacted, and a sample of 500 two-year owners of model 2 is contacted. The numbers X1 and X2 of owners who report that their cars needed major repairs within the first two years are 53 and 78, respectively. Test the null hypothesis that no difference exists between the proportions in population 1 and 2 needing major repairs against the alternative that a difference does exist. Use α = 0.10
hypothesis test for the difference between two means.grand strand family medical center is specifically set up to treat
a small private golf driving range has 6 different teeing stalls. below is the usage for each stall recorded during one
Identify the null hypothesis and alternative hypotheses (you will need to write the null in your own words as this is not provided in most research reports)
A manager of a large department store with three floors reports that the time a customer on the second floor must wait for an elevator has a uniform distribution ranging from 0 to 16 minutes. It takes the elevator 1 minute to go from floor to floo..
Formulate the appropriate null and alternative hypotheses to test the manufacturer's belief. Using the sample mean of 99.2, compute a 90% confidence interval. Show the computation, and interpret in one sentence the interval you compute.
suppose you wish to estimate the difference between the mean acidity for rainfalls at two different locations one in a
the percentage of values in some commonly used intervals area 68.3 of the values of a normal random variable are within
A standard deviation of 1.5. The distribution is normal. What proportion of faculty consume an amount between 4 and 6 cups?
Plot a scatter diagram and what kind of relationship exists between these two variables
wageweb is a service of hrpdi and provides compensation information on more than 170 benchmark positions in human
a report announced that the median sales price of new houses sold one year was 211000 and the mean sales price was
binary signals are transmitted at a constant rate of 1000 per second. suppose that transmission errors occur
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