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A final exam in math 160 has a mean of 73 with a standard deviation of 7.8. 40 students are randomly selected and their scores are averaged:a. What is the mean of the sampling distribution of the means of samples of size 40?
A random sample of n=9 men between 30-39 years old is asked to do as many sit ups as they can in one minute. The mean number is x=26.2 and the standard deviation is s=6. Find a 95% confidence interval for the population mean.
Ten members of a fraternity take a statistics course. Here are their scores on the first exam in the course:
The probability of a bulb lasting less than 2300 is .1573. The maximum probability of a bulb lasting less than 2300 hours should be only 5%. What must change specifically? How would that change be obtained practically?
What sample size must be taken to estimate the average gas price in houston with 99% confidence and max error of 5 cents? Assume population standard deviation of gas prices is 60 cents.
What sample size would be required to obtain the error of ±10 square millimeters with 99 percent confidence?
68 of these drivers were wearing seat belts. We wish to find if these data give good reason to conclude that more than half of Hispanic female drivers in Boston wear seat belts.
Does the breakfast revenue seem to increase as the number of occupied rooms increases? Draw a scatter diagram to support your conclusion.
Surveys 32 currents students discovering that 12 will return for summer school. b. with a 0.95 probability, how large of a sample would have to be taken to provide a margin of error of 3% or less?
A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances. Determine the standard deviation. Compute the coefficient of variation.
In calculating the UCR rape rates in New York City, which of the following would appear to be the best data for the denominator?
In the last quarter of 2007 a group of 64 mutual funds had a mean return of 0.9% with a standard deviation of 5.2%. Consider the normal model N(0.009.052) for the returns of these mutual funds.
Use RNG in Excel to generate n = 5 observations from the Normal distribution N(20, 5). Test H0: μ = 20 versus H0: μ ≠ 20 at the α = 0.05 level of significance. Repeat this process 100 times and then count the number of times that you reject H0.
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