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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.
listed are the ages in years of randomly selected race car drivers use a 0.05 significance level to test the claim that
An analyst working at BC Statistics is compiling a report on the use of the internet at home. In 1997, 250 randomly selected people were asked about the average amount of time spent on the internet per week.
Twenty defective products are found after a long working day. What is the probability that all the defective products can be reworked?
the following is a cross-tabulation taken from a subset of the 2010 general social survey. respondents were asked
Conduct the most appropriate hypothesis test using a 0.05 significance level. Construct a 95% confidence interval for the true proportion of automobiles with drive trains that fail.
Can we conclude, at the level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from months?
according to a government study among adults in the 25- to 34-year age group the mean amount spent per year on reading
if you are interested in how well students perform on a standardized math achievement test after they have completed a
A random sample of 49 employees took a computer literacy test. The sample resulted in a mean score of 75 with a standard deviation of 21. Estimate the standard error of the mean.
To determine monthly rental prices of apartment units in San Francisco Bay area, samples were constructed in the following ways. Identify the technique used to produce each sample.
the distribution of heights of adult males is normally distributed with mean 68 inches and standard deviation 2.9
Can you please describe what I need to do to complete this? I do not understand how to plot the figures within the spreadsheet or calculate them.
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