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In order to save costs, a firm issued a guideline that fax transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions yielding a sample mean of 14.44 with a standard deviation of 4.45 pages. At 0.01 level of significance, is the true mean greater than 10? (use rejection region method)
a university planner is interested in determining the percentage of spring semester students who will attend summer
If the null hypothesis is rejected, can you state that the mean score of those with a rural background is different from the score of those with a large-city background?
1. The structure of these data resembles the structure of the data in the pricing example, but there are differences. (a) If we consider the satisfaction data as an experiment, with response Rating, are the data balanced?
Let X1,... x30 be independent Poisson random variables having mean 1. (a) Use Chebyshev's inequality to find a lower bound on the probability.
a random sample of 121 checking accounts at a bank showed an average daily balance of 280. the population standard
Using these data, construct a 99% confidence interval to estimate the average number of days and excavator is rented to a client, and assume the number of days per rental is normally distributed in the population.
which of the follow samples will have the smallest value for estimated standard error?n 100 with s2nbsp 100n 25 with
what is the distribution of the case described here? mr. hr hits a homerun in his turn at a baseball game with 5 of
Find the 95% confidence interval for the mean, of the population from which the sample was drawn. (Round the values to whole numbers for your confidence interval.)
Is this statistically significant evidence that candidate has sufficient valid signatures overall? Describe.
In a cross sectional study of bicycle helmet use, authors were interested in assessing neighborhood socio-economic status (as measured by percentage of school children receiving free or reduced-fee lunches at school) and percentage of bicycle ride..
State a hypothesis related to this study that would cause you to conduct a one-tailed test. State a hypothesis related to this study that would cause you to conduct a two-tailed test.
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