A trucking company claims that when it ships eggs, 93% of the eggs will arrive unbroken. You check 350 of the eggs that the trucking company shipped and found that 315 eggs were unbroken. Can the trucking company’s claim be supported to a level of significance of α = .03, test the hypothesis.
1.Researchers developed a safety performance function (SPF), which estimates the probability of occurrence of a crash for a given segment of roadway. Using data on over 100 segments of roadway, they fit the model
The total cholesterol levels of a sample of men aged 35-44 are normally distributed with a mean of
A researcher hypothesizes that people who listen to classical music have higher concentration skills than those in the general population. On a standard concentration test, the overall mean is 15.5. The researcher gave this same test to a random sample of 12 individuals who regularly listen to classical music. Their scores on the test were […]
At some vacation destinations, “all-inclusive” resorts allow you to pay a flat rate and then eat and drink as much as you want. There has been concern about whether these deals might lead to excessive consumption of alcohol by young adults on spring break trips. You decide to spend your spring break collecting data on […]
The data to the right shows the number of graduating students with business majors at a university over the last 15 years. 271 265 260 254 249 243 238 232 221 216 209 203 190 181 173 a. Construct a box-and-whisker plot for this […]
Suppose amongst all the families on a Caribbean Cruise, the population variance of the number of children per family is 4. If we were to take a sample of 10 families, then the probability is .9 that the sample variance is less than ___. (Hint: Use the χ2 distribution.)
After giving a short definition, compare and contrast the two concepts below:
280 45 Part a) Find an unbiased estimate of the population mean ¯yU . Suppose that the sample standard deviation is s = 170, estimate the variance of your unbiased estimator. (Ignore finite sample corrections) Part b) Suppose one treats the sample as a stratified random sample with proportional allocation. Re-estimate ¯yU using stratified sample […]
