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Suppose you know that the distribution of sample proportions of the residents of one town over 70 years old in samples of 110 residents is normal with a mean of 0.12 and a standard deviation of 0.03. You select a sample of 110 residents and find that the proportion of residents over 70 is 0.09. The standard score corresponding to this sample proportion is -1. What is the probability that a second sample would be selected with a proportion less than 0.09?
A. 0.8413
B. 0.5187
C. 0.1357
D. 0.8643
1.a national poll of 600 men announced that the proportion in the survey who claimed to help their wives at home was
What is the probability that more than one machine is in the system? Probability that more than two are broken and waiting to be repaired or being serviced? More than three? More than four?
Make a histogram showing the probabilties of r = 0, 1, 2, 3, 4, 5, 6, 7 or 8 defective syringes in a random sample of 8 syringes.
Suppose a random sample of 500 adults is asked, "Do you own a credit card?" Describe the sampling distribution of p ^ , the proportion of adults who own a credit card.
A 10 year study by the American Heart Association provided data on how age, blood pressure and smoking relate to the risk of strokes.
The length of a human pregnancy has a mean of 267 days and a standard deviatin of 16 days. Assume a normal distribution. What percent of pregnancies last over 283 days.
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Recognize and describe potential threats (up to 3) to internal validity.
How many more sheep should be included in the sample if we want to say with 98% confidence that the population mean weight of the Jacob sheep is within 2.0 lb of the sample mean?
How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 5 percentage points with 92% confidence?
the demand for a product of carolina industries varies greatly from month to month.based on the past two years of data
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