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Construct a 99% confidence interval for the difference between the two population proportions. Assume that the samples are independent and have been randomly selected.
Using the Minitab t calculator, Find the value from the t distribution (to two decimal places) for the calculation of a margin of error for 92% confidence and 38 degrees of freedom is?
In general, when dealing with inferences for two population proportions, which two of the following are equivalent: Confidence interval method; P-value method; critical value method?
In a recent New York City marathon, 25,221 men finished and 253 dropped out. Also, 12,883 women finished and 163 dropped out. We want to use a .01 significance level to test the claim that the rate
You randomly select and measure the contents of 10 bottles of cough syrup. The results (in fluid) are shown. Assume the sample is taken from a normally distributed population. Construct 95% confiden
Nissan sold three models of cars in North America in 1999: Sentras, Maximas and Pathfinders. Of the vehicles sold, 50% were Sentras, 30% were Maximas and 20% were Pathfinders. In the same year 12% o
Using an alpha level 0f 0.01 determine if there is a difference in the varibility of the two tire brands.
Please tell me the class width, class limits, class boundaries, midpoint, frequency, relative frequency, and cumalitive frequency
If Ho: B1 = 0 is not rejected, what is the best estimate for the value of the response variable for any value of the explanatory variable?
Does the difference between the probabilities of parts (a) and (b)explain how insurance companies stayin business? Large auto insurers are certainly profitable. One report, for example, claims that
1. What are the assumptions of the simple linear model? 2. Name three assumptions of the ANOVA test?
A television station estimates that 60% of college studentswatch the super bowl. For a sample of 240 students selected at random, what is the mean and variance of the number of students who watch th
On the average, the annual profits are $8000 for each elementary book, $7000 for each intermediate book, and $1000 for each advanced book. How many new books of each type should be published to max
There is sufficient evidence to conclude that the mean price of a single-family home has not changed. There is not sufficient evidence to conclude that the mean price of a single-family home has not c
Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Identify the null and alternative hypothesis, test statistic, P-value, critical
Now instead of fixing the total sample size n, we fix total survey cost C. Find the allocation of n1, ..., nJ that minimizes the variance of the estimator for the population mean. You may ignore the
A random variable is normally distributed with a mean of 25 and a standard deviation of 5. If an observation is randomly selected from the distribution, determine two values of which the smallest ha
An urn contains 7 red marbles and 3 white marbles. Three marbles are drawn from the urn one after the other. Find the probability that the first two are red and the third is white.
When testing H0:u > u0, using confidence intervals, if u is not contained in the confidence interval then we would A. Draw no conclusion B. Reject H0 C. Alter the level of confidence to allow u
In constructing a confidence interval for the mean, the z distribution provides a result nearly identical to the t distribution when n is large.
Find the standardized test statistics t for a sample with n = 12, sample mean = 19.2, s = 2.2 and a = 0.01 if H0: u =18: Round answer to three decimal places.
You wish to test the claim that u > 11 at a level of significance of ? = 0.05 and are given sample statistics n = 50, sample mean = 11.3 and standard deviation = 1.2 Compute the value of the tes
The discrete random variable X is the number of students that show up for Professor Smith's office hours on Monday afternoons. The table below shows the probability distribution for X. What is the p
Does random sampling guarantee that the sample chosen will be representative of the population?
These data are observations collected using the completely randomized design. Test if there is a significant difference between all 3 population distributions.