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The National Assessment of Educational Progress (NAEP) gave a test of basic arithmetic and the ability to apply it in everyday life to a sample of 840 men 21 to 25 years of age.Scores range from 0 to 500; for example, someone with a score of 325 can determine the price of a meal from a menu.The mean score for these 840 young men was x = 272.We want to estimate the mean score μ in the population of all young men.Consider the NAEP sample as an SRS from a Normal population with standard deviation σ = 60.
If we take many samples, the sample mean x varies from sample to sample according to a Normal distribution with mean equal to the unknown mean score μ in the population.What is the standard deviation of this sampling distribution?
a sample of size 80 is to be used to test the hypotheses h0 mu29 vs. ha mugt29where mu is the true average age of a man
a survey is taken in which 40 randomly selected respondents aged 25-40 are asked how many biological children they
the population in millions and the violent crime rate per 1000 were recorded for 10 metropolitan areas. the data are
find an interval that would contain 68% of all data values from the sample.
It will take 30 minutes regardless of the traffic conditions. Lynn's utility for travel time is: U(15 minutes) = 0.9, U(30 minutes) = 0.7, and U(40 minutes) = 0.2. Which route will minimize Lynn's expected travel time?
What is the probability that in the next 15 minutes information about 10 or fewer potential customers arrives and what is the probability that 3 or fewer of the calls are successful
A nutritionist conducted an experiment on memory for dreams. She wanted to test whether it really was true that eating cheese before going to bed made you have bad dreams. Over three nights, the nutritionist fed people different foods before bed.
How are air cargo rates calculated? Calculate the cost of international air transportation for the following shipment: 200 cartons of fine jewelry weighing a total of 2,500 pounds. The carton dimensions are 18 in by 12 in by 12 in (L × W × H). The..
1. For ?xed B such that P(B) > 0, show that P(·|B) satis?es the axioms of probability.
the time t between emissions radioactive emissions has an eponential distribution with a mean of 4 seconds between
A paint manufacturer claims its paint will last an average of 16 years. Assume that paint life is normally distributed with a standard deviation of 3.2 years. Suppose a random sample of 20 houses are painted with this manufacturer's paint. What is..
Electronic teller machine during the prime shopping hours in a department store. What is the probability that Exactly six people will use the machine during a randomly selected hour.
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