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As part of a safety check, the Keystone Cops randomly stopped 65 ambulances and checked their tire pressure. The sample mean was 32 lbs/sq. in. with a sample standard deviation of 2 lbs/sq. in. Find the 98% confidence interval for the population mean.
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
Assume you choose 20 houses at random. On average, how many houses of twenty would you expect to have DVD? Determine standard deviation of number of houses with DVD?
Probability based on binomial distribution - evaluate the probability of x successes in the n independent trials of the experiment.
The weight of the oranges, in pounds (1 pound = 16 ounces) is a random variable with standard deviation
Would the null hypothesis be accepted or rejected in this case?
In a random sample of 53 concrete specimens, the average porosity (in percent) was 21.6 and the standard deviation was 3.2. a) Find a 90% confidence interval for the mean porosity of specimens of this type of concrete.
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
Determine the mean, median, and mode for data set: 12.75, 18.32, 19.41, 12.75, 18.30, 19.45, 19.33
Find the mean and standard deviation for the population and population of exam scores
Illustrate by computation that, for straight -line regression of Y on x, β1= 0.
Find the probability that in a given month:
What is the distribution of sample means.
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