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In order to fairly set flat rates for auto mechanics, a shop foreman needs to estimate the average time it takes to replace a fuel pump in a car. Assume that the standard deviation of all times is 30 minutes.
a. Determine the minimum sample size he must select if he wants to be 90% confident that the true average time is within 10 minutes of the sample average?
b. Repeat part (a) using a 95% confidence interval.(a) Which level of confidence requires a larger sample size? Explain.
Solar cells are attached to a panel with a new heat resistant adhesive. The adhesive must provide 2.80 pounds of force in order to hold the cell on the panel. A random sample of 50 cells is tested and the following forces are necessary to break th..
The sample standard deviation is $2,050. Using this information, calculate the 95% confidence interval (rounded to the nearest $10). Interpret your findings.
Possible test scores could range from 0 to 500. Assume that the scores are normally distributed. Find the probability that a student had a score higher than 320.
What is the probability that the trainee class will consist entirely of men or women? Round your answer to the nearest thousandth.
In 1990, the population of Austin, Texas, was 494,290. During the next 10 years, the population increased by about 3% each year.
Surface area of a cube. The formula A=6V^2/3 gives the surface area of a cube in terms of its volume V. What is the volume of a cube with surface area 12 square feet?
Make a decision using the p-value approach at the given α = 0.05.
The U.S. National Center for Health Statistics. Suppose that we randomly select fifteen 20-year-olds. How many do you expect to still be alive at age 65?
Chandra has 5 liters of a 24% solution of sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 8 liters of 27% solution?
Find the critical value for a right-tailed F-test when alpha=.05 the degrees of freedom for the numerator (d.f.N.) are 15, and the degrees of freedom for the denominator (d.f.N.) are 21.
A die is rolled 60 times. An "ace" is the side with one dot. Use the normal approximation to estiate the chance of getting exactly 12 aces.
At.05 level of significance can director conclude that there is difference in the number of circuit cards bought by month?
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