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The manager of a bank recorded the amount of time each customer spent waiting in line during peak business hours one Monday. The grouped frequency distribution below summarizes the results.
Waiting Time (Minutes) # of Customers
0-2 14
3-5 10
6-8 9
9-11 8
12-14 5
15-17 3
18-20 1
Based on the grouped frequency distribution, you are to identify the mean and median for waiting times.
Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one is using z test to test differences between two means?
In a group of 6 computer programmers, what is the probability that none are introverts? What is the probability that 4 or more are introverts?
Given an infinite population with a mean of 75 and a standard deviation of 12, the probability that the mean of a sample of 36 observations, taken at random from this population
In addition, the gender of the respondent is noted. After analyzing the results the following table of joint probabilities was produced: Find the probability that a customer who rates Windsor as excellent is a man. 0.45
Explain the difference between a discrete and a continuous random variable. Give two examples of each type of random variable.
15% with salmonella, and 13% with both. What is the probability that a tested chicken was not contaminated with either kind of bacteria?
Assume rivets are defective independently of one another, each with the same probability. If 24% of all seams need reworking, determine the probability that rivet is defective?
Now make a scatter plot of data from 1982 to 1998 (again, use years since 1800). Determine a linear, power, or exponential model that explains the crude oil production during this time period.
In a speech to the Chamber of Commerce, a city councilman claims that in his city less than 15% of the adult male population is unemployed.
For any distribution the score that separates the highest 10% from the rest of scores is called.
Conduct a one-tailed hypothesis test for the mean at the .025 significance level. State the null and alternative. State the critical value. Draw a diagram. Provide the computation of the test statistics. State your decision in terms of the null hy..
Industry standards suggest that 10 percent of new vehicles require warranty service within the first year. What is the probability that none of these vehicles requires warranty service?
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