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Consider each situation described below. Identify the population and the sample, explain what p and p^ represent, and tell whether the methods of this chapter can be used to create a confidence interval.
a) Police set up an auto checkpoint at which drivers are stopped and their cars inspected for safety problems. They find that 14 of the 134 cars stopped have at least one safety violation. They want to estimate the percentage of all cars that may be unsafe.
b) A TV talk show asks viewers to register their opinions on prayer in schools by logging on to a Web site. Of the 602 people who voted, 488 favored prayer in schools. We want to estimate the level of support among the general public.
c) A school is considering requiring students to wear uniforms. The PTA surveys parent opinion by sending a questionnaire home with all 1245 students; 380 surveys are returned, with 228 families in favor of the change.
d) A college admits 1632 freshmen one year, and four years later 1388 of them graduate on time. The college wants to estimate the percentage of all their freshman enrollees who graduate on time.
a lock on a bank vault consists of three dials each with 30 positions. in order for the vault to open each of the three
the manager of a manufacturing company believes that experience is the most valuable variable in determining a workers
scores on the critical reading part of the sat exam in a recent year were roughly normal with mean 501 and standard
The floor plan of a house is rectangular. The house's length is 2x-10 and its width is x+3. Write an expression for the area of the house
Consider the following two columns that describe different types of data: A. Nominal 1. Qualitative B. Discrete 2. Quantitative C. Ordinal D. Continuous. The correctly paired groupings of the two columns is:
A survey result was that 54% of the sample said they get along "very well" with their parents. Using the reported margin of error, calculate a 95% confidence interval for the population proportion that gets along "very well" with their parents.
Two colored dice are tossed. What is the probability that the sum of the numbers shown on the upper faces is equal to 7?
Determine if this sample data provides sufficient evidence to indicate that the bulbs have their advertised life expectancy. Do NOT do a confidence interval.
Suppose the probability that a federal income tax return conatins an arithemetic error is 0.2. If 10 federal income tax returns are selected at random,
What is his expected cash balance at the end of the following May and what is the probability that his balance will be negative in one or more month?
question the manufacturer of a steel-belted radial tire claims that the mean mileage the tire can be driven before the
test the given claim. assume that a simple random sample is selected from a normally distributed population. use either
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