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A publisher wants to estimate the mean length of time (in minutes) all adults spend reading newspapers. To determine this estimate, the publisher takes a random sample of 15 people and obtains the results below. From past studies, the publisher assumes the standard deviation is 1.9 minutes and that the population of times in normally distributed.
10, 9, 11, 9, 7, 10, 11, 6, 12, 7, 6, 7, 10, 10, 8
The 95% confidence interval is? (round to one decimal place)
Summarize the results of the data analysis.
Suppose we select a sample of 40 tires and use a simulator to determine the tread life. What is the likelihood of finding that the sample mean is between 59,050 and 60,950?
Find the percentage of the 1000 enemy that will be destroyed.
A teacher figure that final grades in the statistics department are distributed as A,25%, B, 25%, C, 40%, D, 5%, F, 5%. At the end of the randomly selected semester, the following number grades were recorded.
You don't have a population standard deviation but you have sample data. Calculate a sample mean and standard deviation and use the sample standard deviation value to complete the inferential test.
The KW water is provided to approximately 750,000 people, who are served through more than 362,000 accounts. All accounts are metered and billed monthly.
if the random q has a continuous uniform distribution with parameters a0 and b3 find the probability that the roots of
The regression of Y on X predicts? When predicting Y, adding a second predictor variable to the first predictor variable X.
Describe the distribution of sample means (shape, expected value, and standard error) for samples of n=36 selected from a population with a mean of µ=100 and a standard deviation of σ=12.
below you are given ages that were obtained by taking a random sample of 9 undergraduate students. assume the
a researcher wants to estimate at a 99 confidence level the mean age of all persons who own sports cars. it is known
What fraction of the calls last between 4.2 and 5 minutes?
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