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The Boston public school district has had difficulty maintaining on-time bus service for its students ("A Year Later, School Buses Still Late," Boston Globe, October 5, 2011). Suppose the district develops a new bus schedule to help combat chronic lateness on a particularly woeful route. Historically, the bus service on the route has been, on average, 12 minutes late. After the schedule adjustment, the first 36 runs were an average of 8 minutes late. As a result, the Boston public school district claimed that the schedule adjustment was an improvement-students were not as late. Assume a population standard deviation for bus arrival time of 12 minutes.
Develop the null and alternative hypotheses to determine whether the schedule adjustment reduced the average lateness time of 12 minutes.
Should H0 be rejected? What should the researcher conclude and determine the 95% confidence interval for the population mean, based on the sample mean.
Solve following for x, expressing answers as compound fractions and integers where appropriate:
Determine the probability, using binomial distribution, of obtaining 4 or more nonconforming units when sampling 30 computers from batch known to be 10% nonconforming.
1.some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and
A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. (b) Calculate a p-value and interpret it.
Also, the sample data appear to have a bell-shaped distribution. Construct the 95% confidence interval for the mean time spent on paperwork by all managers.
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
MATH1550H: Assignment:Questions: (Genetics) What is the probability that at most two of the offspring are aa?
the quantity of milk in a bottle is normally distributed with mean 1000ml. find the standard deviation given that the
Psychological test. For the sample data, n = 50,mean = 17.3 and S.D = 5.4.USE level of significance = .05. Complete hypotheses testing using P value approach.
People in a large population average 60 inches tall. You take a random sample and will be given a dollar for each person in your sample who is over 65 inches tall.
In a recent survey 35 percent indicated chocolate was their favorite flavor of ice cream. Suppose we select a sample of 10 people and ask them to name their favorite flavor of ice cream.
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