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Suppose we roll three fair six-sided dice. Compute the conditional probability that the first die shows 4, given that the sum of the three numbers showing is 12.
question a recent study examined the number of unemployed people in 5 cities who are actively seeking employment. at
A researcher is conducting proportionate stratified random sampling with a sample size of 250. Approximately how many people should be sampled from each stratum?
The mileage per day is distributed normally. Find the probablitly that a truck drives at least 133 miles in a day. Round your answer to 4 decimal places.
in a randomized trial who should be blinded to which treatment group the patient is assigned?1. the patient2. the
Public health statistics indicate that about 26.4% of Americans smoke. Suppose a random sample of 50 people is selected. Approximate the distribution of the same proportion with the normal model.
when a truckload of apples arrives at a packing plant a random sample of 175 is selected and examined for bruises
a report states that 40 of home owners had a vegetable garden. how large a sample is needed to estimate the true
A researcher wants to see if there is a relationship between birth order and personality. A sample of n = 100 people is obtained, all of whom grew up in 3-child families.
Percentage points in either direction from what would have been obtained by interviewing all voters in the United States." Find the sample size suggested by this statement.
You may use the manual method of calculation, or show how MegaStat (or other software) is used to analyze the data. Be sure to discuss the interpretation of results.
An engineer was interested in comparing the variability of the power of a laser at current levels of 16 amps (X) and 20 amps (Y). To do so, random samples of 25 observations of power readings were obtained at each current level. The samples ..
The lifetime of a color television picture tube is normally distributed with a mean of 7.8 years and a standard deviation of 3 years. What is the probability that a picture tube will last more than ten years?
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