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A retailer store sales onle two styles of stereo consoles, and experiences shows that these are in equal demand. Four customers in succession come into the store to order stereos. The retailer is interested in their preferences.
a. List the possibilities for preference arrangements among the four customers.b. Assign probabilities to the sample points.c. Find the probability that all four customers prefer the same style.
Will the margin of error for estimating the population proportion change from state to state if an SRS of 4000 tax returns is selected in each state?
As an illustration, if contestant 1 obtains a smaller value than contestants 2 and 3 but contestant 4 has a smaller value than contestant 1 (X4 n) as a function of n.
While 3% of the cellular calls with company B will have interference. Given that a randomly selected cellular call is that has interference, what is the probability it came from company A.
The analysis needs to be re-run adding the error into the regression sum of squares.
A sample of 3000 observations has a mean of 82 and a standard deviation of 16. Using the empirical rule, find what percentage of the observations fall in the intervals , and x+/- 1s, x+/- 2s x+/- 3s.
Tests of hypothesis for two populations. List one test statistic that could be used for comparing two populations with hypothesis testing. Can you think of an example where this could be used?
When bucketing data for a histogram what is the standard way of dealing with data entries that are on the boundary of two buckets?
Which of the following assumptions is not made for the F-test for comparing three or more means?
Nine percent of undergraduate students carry credit card balances greater than $7,000. Suppose 10 undergraduate students are selected randomly to be interviewed about credit card usage.
A random sample of 200 people was taken. Sixty percent of the people favor President Obama. The 95% confidence interval for the true population of people who favor Obama is?
For the samples summarized below, test the hypothesis that the two variances are equal, at α = 0.05
Using the empirical rule, what is the approximate percentage of the men between the following values? A. 176 cm and 186 cm B. 166 cm and 196 cm.
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