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Suppose a car manufacturer believes its windscreen wipers will last on average for three years on their cars if driven by a typical driver in the province. Moreover, the manufacturer believes the lifetime of the wipers under such conditions is Normally distributed with a standard deviation of two years. Find the probability that, if on a car driven by a typical driver, a windscreen wiper lasts for a time that is not within 1.4 years of the mean lifetime.
How large a sample is required if the 97 percent level of confidence is used and the estimate is to be within $2,500? The standard deviation is $16,000.
At.05 level of significance, is there evidence to propose that mean life length of the batteries manufactured by this manufacturer is more than 400 hours?
How many commuters must be randomly selected to estimate the mean driving times of Chicago commuters? If we want 99% confidence that the sample mean is within 2 minutes of the population mean, and the population standard deviation is known to be 1..
Perform the appropriate test of hypothesis to determine whether Kim's average time has changed. Use alpha=.01. Compute the power of the test if Kim's actual mean swimming time is 147.3 seconds. Interpret the results.
In 1997, 39.4% of men had made orders by phone in the last 12 months a market research analyst feels that this percentage has declined because of internet purchases. she obtains a random sample of 500 men and determines that 191 of them have made ord..
Let X be the number of yes votes obtained from a random sample of 200 out of the entire voting population. What is the expected value of X if, in fact, 65% of all voters supported the dictator?
alice and bob plan to arrive independently at a certain restaurant between 1200 and 100. suppose that the arrival times
state the hypotheses and identify the claim. compute the test value At a = 0.05, decide if there is enough evidence to reject the claim of no difference in the ages fo the two groups. Compute and use the standard deviations from the samples.
If the researcher deems the data to be statistically significant, which of the following is true with respect to a conclusion reached?
the random variable x has mean 9 and standard deviation 8. what is the mean and the variance of 2xrespectively?explain
How does a t test differ from a z test in terms of when it is used, how it is calculated, and how we determine significance?
it is decided to measure the resistance of sheets of a certain metal at temperatures x of 100k 200k 300k 400k and 500k.
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