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1.A sandwich shop near campus has a special counter, open from 11 to 1pm, which is used exclusively for selling pre-made sandwiches. The clerk can handle a customer in about one minute. Customers arrive at the rate of 40 per hour on average. How long in minutes does a customer have to wait?
What is the average number of customers waiting in line?
What is the probability of there being two or more customers in the system?
Comments: find T1, N1, and 1-(Po+P1)
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In a sample of 210 men, 35 prefer sugar free soft drinks. In a sample of 220 women, 42 prefer sugar free soft drinks. Using a significance level of 0.05, test whether women prefer sugar free drinks more than men. Calculate the p-value.
Determine the expected value and standard error of the sum of 400 draws?
Bell-shaped with a mean of $45, 000 and a standard deviation of $3, 500. What percentage of teachers earn anywhere from $38, 000 to $48, 500?
Suppose that you perform a significance test regarding a population mean, and that the evidence does not warrant rejection of the null hypothesis.
to test the significance of an individual regression coefficient we would conduct a and look for p-values smaller than
As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 220 applicants 14 failed the test. Develop a 99 percent confidence interval for the proportion of applicants that fail the test. Would it be reasonable ..
What proportion for smoking teenagers think their peers care a lot about keeping their weight down?
The sample standard deviation was 1.1 years. Using the 0.99 degree of confidence, what is the confidence interval for the population mean?
Does the value of the sample linear correlation coefficient, r, indicate that there is a linear dependency between the two variables in the population from which the sample was drawn? Briefly explain how to answer this question.
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