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"Two processes are utilized to produce forgings used in aircraft wing assembly. Of 200 forgings selected form process1, 10 do not conform to strength specs, while 300 forgings selected from process 2, 20 are nonconforming.
a) Evaluate fraction nonconforming for each process.b) Test hypothesis that two processes have identical fractions nonconforming. Use a = 0.05.c) Create the 90% confidence interval on difference in fraction nonconforming between two processes.
Suppose that the incidence of MI is 0.005 per year among subjects who are actually take placebo and that aspirin prevents 20% of MIs
You are running a chi-squared test. You have 2 groups with 3 characteristics each, what would your critical value be with an alpha of .025?
I have fit a line to data representing cholesterol readings for 28 individuals starting a cholesterol reducing drug. The computer provides the following output, The degrees of freedom for the t test for the slope are
State the null and alternate hypotheses if you want to determine whether the mean amount spent is higher for men than for women,
The population mean of a company's racing bicycles is 9.07 kg (20.0 lb) with a population standard deviation of 0.40 kg. If the distribution is approximately normal
What descriptive summary measures would you use to present the data. which measure is the best to use and which is the worse and why?
Compute a 99% confidence interval for the true average number of months taken by bankruptcy petitioners to acquire debts listed on their petitions.
The difference between expected payoff under certainity and expected value of the best act without certainity is the expected:
Advertising coefficient is 200 and t stat is 1.75. Which of the following statements is an accurate interpretation of the situation when using an alpha of .10
Play 100 games of scraps and empirically determine an estimate for the probability of winning.
A battery manufacturer advertises the average life of its automobile battery is 60 months.what % of batteries should last between 50 and 70 months? The standard deviation is 10 months.
The mean amount purchased by a typical customer at Churchill\'s Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the foll..
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