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Fuel Consumption and Cars
The Massachusetts State Police union is interested in the number of miles driven by each officer during an 8-hour shift. Twelve officers are selected from the 11:00 p.m. to 7:00 a.m. shift, and the number of miles traveled by each officer is recorded.
a. Is this an observational or an experimental study?
b. Describe the population and the sample in this problem.
c. Is this a random sample? Justify your answer.
If the population standard deviation is 18.8 days, find the 90% confidence interval for the average number of days worked by all employees who are paid through payroll departments.
If you want to determine whether the number of hours spent in a class was related to exam grades for stats students, which statistical test would you use?
Design an experiment to find out whether workers will be able to deactivate the machine as quickly with their left hands as with their right hands.
Two manufacturing facilities produce 1280 × 1024 LED (light-emitting diode) displays. Twelve displays are chosen at random from each lab, and the number of bad pixels is noted for each display.
Then, label the one that is the claim being made. An employment agency claims that the mean starting salary for actuary assistants is at least $55,000.
A normal distribution was used as the prior for the mean, and it was found that posterior mean was 15 and the posterior standard deviation was 0.1 what were the mean and standard deviation of the prior.
Only 15% of all these washing machines last at least 5 years.- What is the standard deviation of the lifetime of a washing machine made by this manufacturer?
amandas bicylce lock can be opened when 4 different levers are placed opposite their correct digit. each lever can be
The following data relate road width x and accident frequency y. Road width (in feet) was treated as the independent variable, and values y of the random variable Y, in accidents per 108 vehicle miles, were observed.
You perform a one sample mean hypothesis test on a random sample of data and observe a p-value of 0.2157. What is the appropriate conclusion? Conclude at the 5% level of significance.
a club has 200 members 45 of whom are lawyers 38 of the memebres are liars while 132 are neither lawyers nor liars.
Let X be the number of correct guesses by your friend in the 100 trials and Use the Normal approximation with the continuity correction - Which of the following might be reasonably modeled by the binomial distribution
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