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A STAT 200 instructor is interested in whether there is any variation in the final exam gradesbetween her two classes Data collected from the two classes are as follows:
Her null hypothesis and alternative hypothesis are:
(a) Determine the test statistic. Show all work; writing the correct test statistic, without supporting work, will receive no credit.
(b) Determine the P-value for this test. Show all work; writing the correct P-value, without supporting work, will receive no credit.
(c) Is there sufficient evidence to justify the rejection of 0 H at the significance level of 0.05? Explain.
20% of their income tax returns are audited. Of five randomly chosen individuals, what is the probability that none will have their returns audited?
The random variable X, representing the number of accidents in a certain intersection in a week, has the following probability distribution
Find the expression for velocity profile, the mass flow and heat transfer rates of air due to natural convection in a vertical channel of circular and square cross-section
if the z-score of the standirez test statistic is z.529 then is there significant difference between the defect rates
an instructor believes that 20 or less of the students who finish a statistics course get an a grade. a sample of 90
to test the significance of an individual regression coefficient we would conduct a and look for p-values smaller than
Conduct a hypothesis test using the .04 level of significance to determine if there is a difference between the population means.
Suppose that the probability distribution of a random variable x can be described by the formula. Calculate the variance and standard deviation.
Assume that the population of heights of male college students is approximately normally distributed with mean m of 68 inches and standard deviation s of 3.75 inches. A random sample of 16 heights is obtained.
If we assume that the lifetime of this type of bulb has a standard deviation of 400 hours, can we conclude at the 5% significance level that the claim is true.
the number of chocolate chips in an 18-ounce bag of chocolate chip cookies is normally distributed with a mean of 1250
you want to compare the reliability of two machines that insert chips onto electronic cards. the main problem is the
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