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Question: A sample of 33 airline passengers found that the average check-in time is 2.167. Based on long-term data, the population standard deviation is known to be 0.48. Find a 95% confidence interval for the mean check-in time. Use the appropriate formula and verify your result using the Confidence Intervals workbook.
a recent survey reported that in a sample of 300 students who attend two-year colleges 105 work at least 20 hours per
Find out the probability that: (a) The amount requested is between $65,000 or more?
1. What is the difference between a one-tail test and a two-tail test? 2. What is meant by a p-value?
Identify the independent and dependent variables in the following descriptions of experiments:- Students watched a cartoon either alone or with others and then rated how funny they found the cartoon to be.
a pharmaceutical company receives large shipments of ibuprofen tablets and uses this acceptance sampling plan randomly
When trucks arrive at the Ambassador Bridge, each truck must be checked by customs agents. The times are exponentially distributed with a service rate of 10 per hour. What is the probability that a truck requires more than 15 minutes to be checked..
Does sample size make a difference? What assumptions do we need to make in using the t-distribution for the construction of a con?dence interval?
What are the advantages and disadvantages of using figures, tables, and text to report the results of experiments in the research report?
The liquid crystal display in the new Extime brand of digital watches is such that the probability it contin ues to function for at least x hours before failure is con stant (for any given choice of x), regardless of how long the display has al..
Twenty-six percent of couples who plan to marry this year are planning destination weddings. In a random sample of 12 couples who plan to marry, find the probability that exactly 6 couples will have a destination wedding.
When water taxi sank in the Baltimore Inner Harbor, an investigation revealed that the safe passenger load for water taxi was 3500 lbs. It was also noted that the mean weight of passenger was assumed to be 140 lbs.
in a sample of 30 elves the correlation between years of employment and cookie productivity was found to be -0.25.a
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