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The life in hours of a battery is known to be approximately normally distributed, with standard deviation s = 1.25 hours. A random sample of 10 batteries has a mean life of x ¯=40.5 hours.
(a) Is there evidence to support the claim that battery life exceeds 40 hours? Use a = 0.05.
(b) What is the P-value for the test in part (a)?
(c) Calculate an appropriate con?dence interval on life and use to answer part (a)
Under the assumption that co payment amounts are normally distributed, find a 99% confidence interval for the mean amount in dollars.
Calculate a 90% confidence interval for the percentage of homes in the US that had guns at the time of survey.
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a random sample of size 100 is drawn from a population with population proportion 0.70. find the probability that the
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Let = the sample mean of the 100 scores from University X, and = the sample mean of the 100 scores from University Y. What is the probability that will x be greater than y?
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Create a 90% confidence interval for proportion of all kernels that would not pop.
Milligrams with standard devation s=1.0 milligram. construct a 95% confidence interval for the difference between the mean nicotine content of two brands of cigarettes.
a fan cost index is calculated for each of the professional sports to give an idea of what it costs a family to go to a
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