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With individual lines at the checkouts, a store manager finds that the standard deviation for the waiting times on Monday mornings is 5.2 minutes. After switching to a single waiting line, he finds that for a random sample of 29 customers, the waiting times have a standard deviation of 5.7 minutes. Use a 0.025 significance level to test the claim that with a single line, waiting times vary less than with individual lines.
What is the difference between common causes of variation and special causes of variation?
Suppose that in fact 8% of the apples on the truck do not meet the desired standard. What's the probability that the shipment will be accepted anyway?
What is the probability that the sample mean will be at least 1000? Do you need to use the central limit theorism to answer this question? explain.
Two different simple random samples are drawn from two different populations. The first sample consists of 20 people, with 10 having a common attribute.
What is the probability that the participant was aged 20-40 or was influenced by ipad the most? What is the probability that the participants were influenced by ipod the most, given that the participants are aged under 20?
Why do you use the chi-square statistic? What type of data is used with chi square analysis?
Assume that the annual rate of return for a common biotechnology stock is normally distributed with a mean of 5.5% and a standard deviation of 6%.
A particular product is known to have an exponential failure time distribution with a mean of 12 months.
A research firm conducted a survey to determine the mean amount people spend at a popular coffee shop during a week. They found the amounts spent per week followed a normal distribution with a population standard deviation of $4.
Use normal approximation to determine probability that x = 2. Illustrate all work.
Find the probability that a standard normal random variable will assume a value between: Find a z such that 70% of the area is above that value.
What is the sampling distribution of sample means? What is the mean of the sampling distribution of sample means?
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