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Question: Suppose a community group wants to convince city officials to put more trash containers on the city streets. They decide to conduct a survey, but rather than a scientifically valid result, they want their results to show that as many citizens as possible want additional trash containers. Give an example of how they could use each of the following to their advantage:
a. Self-selected sample.
b. Deliberate bias.
c. Ordering of questions.
d. Desire to please.
c. Use a 95% confidence interval to estimate the mean value of y when xρ = 6. Plot the upper and lower bounds of the interval on your scattergram.
Assume σ = 365 and use a = 0.05. Is there any evidence to suggest that the true mean runway length needed for takeoff of an Airbus A350-900 is greater than 8000 feet? Use the p value to draw a conclusion.
Quality control. A consumer organization estimates that 29% of new cars have a cosmetic defect, such as a scratch or a dent, when they are delivered to car.
State the direction of the alternative hypothesis for the test. Type gt (greater than), ge (greater than or equal to), lt (less than), le (less than or equal to) or ne (not equal to) as appropriate in the box.
Because of the difficulty of weighing a bear in the woods, researchers caught and measured 54 bears, recording their weight, neck size, length, and sex. They hoped to find a way to estimate weight from the other, more easily determined quantities.
A researcher suspects that the dependent variable y is linearly related to both x1 and x2, but believes there is little or no interaction between the two predictor variables.- Of the models in this section, which one would likely be most suitable for..
A study is run to estimate the incidence of atrial fibrillation (AF) in men and women over the age of 60. Development of atrial fibrillation was monitored over a 10 year follow-up period. The data are summarized below.
What is the probability that a randomly selected from such a hen weighs more than 11.5 grams. What is the probability that the average of a random sample of 25 eggs from such hens will be less than 5.8 grams?
a Find P(μ > $11,000) for both prior distributions. b That afternoon, the comptroller randomly chose nine accounts and calculated x =
Write an explanation to such a person about how polls can get a good idea of how the entire population will vote by asking a relatively small number of voters.
Calculate the z-score corresponding to each of the following sample means, assuming a population has µ = 60 and a s - 10.
an article suggests that a poisson process can be used to represent the occurrence of structural loads over time.
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