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Use normal approximation to estimate the probability of getting more than 49 girls in 100 births. Assume that boys and girls are equally likely.
A standard deviation of $1500. at the 0.01 level of significance, can it be concluded that state employees earn on average less than federal employees?
The scores of the GRE exam are transformed so they have a mean of 500 and standard deviation of 100. The scores are known to be normally distributed. What is the percentage of students that score below 750?
What is the probability that the debt for a borrower with good credit is more than $18,000?
Find the 99% confidence interval for the population proportion.
If a manufacturer charges x dollars each for soccer balls, then he can sell 3000 - 150x soccer balls per week. Find a polynomial that represents the revenue for one week.
$600 (1 chance in 4800); $200 (1 chance in 2500). Find the expected value of the amount won for one entry if the cost of entering is 52 cents.
Standard deviation was $15.50. For 56 Model B ovens, the mean repair cost was $85 and the standard deviation was $30. At alpha=.01, would you buy Model A?
What are examples of variables that follow a binomial probability distribution? What are examples of variables that follow a Poisson distribution? When might you use a geometric probability?
Assume that a random variable, x, is distributed according to a normal distribution with mean 46 and standard deviation 12. (a) What is the standard error of the estimate, x-bar, if a sample of size 25 is taken?
The proportion of drivers who use seat belts depends on things like age, gender, ethnicity, and local law. As part of a broader study, investigators observed a random sample of 117 female Hispanic drivers in Boston; 68 of these drivers were wearin..
Compute a 95% confidence interval for the average time spent in training per year at this firm. Develop a graph showing the data below as a frequency distribution. Note the mean and the confidence interval on the graph.
One professor teaches a large section, section A, of a particular class, and on the first test of the term, the test scores in section A were approximately normally distributed with a mean of 78 and a standard deviation of 6.
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