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A study of service times at the drive-up window of fast-food restaurants shows that the average service time at McDonald's restaurants was 2.78 minutes. Service times such as these frequently follow an exponential distribution. What is the probability that a customer's service time is more than 2.78 minutes? (Use lecture notes from last class and your own diligence to solve this problem).
Standard deviation of 19.5. Use a 0.05 significance level to test the claim that the sample comes from a population with a standard deviation less than 23.4.
kim is playing scrabble. what is the probability that she chooses the tile with the letters of her name in order when
The t statistic for comparing the mean prices is 2.1. What can we say about the value of the P-value?
8.which of the statements about line-balancing is true?a.if a precedence relationship exists between tasks a and b they
For each of the examples below, decide if X is a binomial random variable. If so, specify n and p. If not, explain why not.
a. Formulate the hypotheses to determine whether or not the lathe is in perfect adjustment. Please write out all steps used.
Find a 95% confidence interval for the mean number of days it takes Rebco's customers (as a combined group) to pay their bills.
1. Discuss the context in which can be analyzed by using a random-effects model. 2. What are the reasons for conducting a two-way analysis rather than two sep- arate one-way ANOVAs? Explain.
a box contains 17 pink 18 purple and 31 red jelly beans. if 13 jelly beans are selected at random what is the
Test the claim that the mean SAT score for Stevens High graduates is the same as the national average. Test this claim at the 0.10 significance level.
A billiards parlor in a small town is open just 4 days per week-Thursday through Sunday. Revenues vary considerably from day to day and week to week.
Is there any statistically significant difference in how the drugs perform? If so, explain the effect. Use the post hoc tests as needed.
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