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Question: Graduation. It's believed that as many as 25% of adults over 50 never graduated from high school. We wish to see if this percentage is the same among the 25 to 30 age group.
a) How many of this younger age group must we survey in order to estimate the proportion of non-grads to within 6% with 90% confidence?
b) Suppose we want to cut the margin of error to 4%. What's the necessary sample size?
c) What sample size would produce a margin of error of 3%?
Toledo, OH has been experiencing improved economic growth following huge capital investments from companies like Chrysler. You have just been hired by RGP, an agency for facilitating business expansion and location in the Toledo metropolitan area.
Record the length of time spent on the page. Refer to the previous exercise. You also decide to measure the length of time a visitor spends on your page. Give the sample space for this measure.
Chapter twelve of the text discusses probation and other forms of alternative sentencing. Not putting people in jail is a good idea, but only if the alternative to incarceration is successful.
Obtain the estimated regression function. Plot the estimated regression function and the data. Does a linear regression function appear to give a good fit here?
Suppose that the number of calories in McDonald's Egg McMuffin is normally distributed random variable with mean of 290 calories and standard deviation of 14 calories.
To estimate this proportion he went to a large student parking lot during the middle of a class day. He found that 325 out of 1037 cars (31%) were red.
What do you think is the ideal number of children for a family to have?" A Gallup Poll asked this question of 1016 randomly chosen adults. Almost half (49%) thought two children was ideal.
Refer to the part of given Example in which two students are drawn without replacement from a class of 30 students in which three are left-handed. Draw a tree diagram to illustrate that the probability of selecting two left handed students is 1/14..
a distribution center receives shipments of a product from three different factories in the quantities of 6040 and 20.
At α = .05, is there a difference in variances? Illustrate all steps clearly, including illustration of the decision rule.
in basketball a players free throws percentage ft is expressed as a number between 0 and 1 which represents the
A supplier of 3.5" disks clams that only 1% of the disks are defective. In a random sample of 600 disks, it is found that 3% are defective, but the supplier claims that this is simply a sample fluctuation. At the 0.01 level of significance, test t..
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