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The probability that an automobile being filled with gasoline also needs an oil change is 0.25; the probability that it needs a new oil filter is 0.40; and the probability that both the oil and the filter need changing is 0.14.
(a) If the oil has to be changed, what is the probability that a new oil filter is needed?
(b) If a new oil filter is needed, what is the probability that the oil has to be changed?
Create a hypothesis and write out the eight steps used to apply a statistical test to your hypothesis.
Form the column of differences and find the mean and standard deviation of this column of numbers.
Discuss ratio, interval, nominal and ordinal variables. Explain what is meant by a margin of error for a confidence interval.
We then counted the number of statements in the summary that can be classed as inferences. Assume inferences are interval measurement.
What is the probability that a cereal would both high calorie and high fiber? In other words, what is P (high calorie and high fiber)?
Find the mean and the standard deviation of the sampling distribution of -x and find the interval containing 95.44% of all possible sample means returns.
An airline has surveyed a simple random sample of air travelers to find out whether they would be interested in paying a higher fare in order to have access to e-mail during their flight.
Happy Hector and Party Paul are each having a catered party at Fun Factory. Hector's party is in the hall and Paul's party is on the Patio.
Let sample s approximate population sigma. How come the t- table in the AP booklet has degrees of freedom entries way past 30 ??? What am I missing??
Profitability at a bank is declining as customers are shifting to other banks. As a researcher, identify the problem (root cause of the symptom) through a scientifically crafted research proposal.
At.01 significance level is it sensible to conclude that modification decreased the number of traffic accidents?
The time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes.
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