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A report states that 46% of home owners have a vegetable garden. How large a sampl.e is needed to estimate the true proportion of home owners who have vegetable gardens to within 4 percentage points with 95% confidence?
a) 140
b) 238
c 309
d) 476
At least half the patients are under 15 years old? First, explain how this can be modeled as a binomial distribution with 8 trials, where success is visitor age is under 15 years old and the probability of success is 20%.
If 50 cups of coffee were measured, what is the probability that: The sample mean per cup is less than 7.8 ounces?
Determine the probability that the project will be completed in 90 days or less.
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and a = 0.01. What are the critical values?
For a discrete probability function that is given as: a. What is the expected value E(Y)? b. What is the standard deviation (σ) of the random variable Y?
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?
Let x be a random variable that represents a test score. What is the lowest score that would still place a student in the top 40% of the scores?
What is the probability of selecting a female or an accounting major? Which rule of addition did you apply?
Given the standardized normal distribution (with a mean of 0 and a standard deviation of 1, as in Table E.2), what is the probability that:
According to Central Limit Theorem, how big of sample is essential to be sure sampling distribution of sample means is normally distributed.
Under proposed plan, how long, on average, will patient stay in ER? On average, how long will Potential Admit stay in ER?
Prepare a frequency distribution from data given below that describes how long it took a person to drive to work in work week.
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