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An automatic machine that fills bags of unpopped popcorn is operating properly if the weights are independently and normally distributed with a mean of 113 grams and a standard deviation of 5.4 grams. Find the probability that if 7 bags are randomly selected, their mean weight exceeds 114 grams.
Construct the 95% confidence interval estimate of the mean number of migraine attacks for those treated with acupuncture.
Suppose the population standard deviation is unknown. If 71% of all sample means are greater than 49 hours and the population mean is still 50.4 hours, what is the value of the population standard deviation?
He (given that) the true proportion of perfect condition items is only 80% what is the probability that the lot will not be shipped?
hen investigating a relationship between birth weight and IQ, researchers found that 258 subjects with extremely low birth weights (less than 1000 g) had Wechsler IQ scores at age 8 with a mean of 95.5 and a standard deviation of 16.0.
Provide an example and state the Null and the Alternative hypothesis for the examples in symbolic form.
Federal administration stated that unemployment level in US is 8.6% (population proportion = 0.086). A hypothesis test is to be performed to decide whether unemployment level in NY State differs from national level.
The article can be on Descriptive Statistics, Probability and the Normal Distribution, Sampling and Sampling Distributions, Regression Analysis, or Time Series Forecasting.
The final examination of a course requires an essay. The number of pages from a sample of 25 students were collected. The data are:
This distribution is positively skewed. The standard deviation of the population is not known.
These are the winning numbers. To win the lottery, a person must select the correct 5 numbers in the same order in which they were drawn. What is the probability of winning?
Standard deviation of 10 pounds.. Find the probability, P(W
If 9 measurements are randomly selected from this population, what is the probability that the sample mean will exceed 104?
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