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A Gallup telephone poll of 1240 teens conducted in 2001 found that boys were more likely than girls to play computer games, by a margin of 77% to 65%. Equal numbers of boys and girls were surveyed.
a) What kind of sampling design was used?
b) Give a 95% confidence interval for the difference in game playing by gender.
c) Does your confidence interval suggest that among all teens a higher percentage of boys than girls play computer games?
Find the probability that a random selected score is between 150 and 157. If a sample of size n = 100 is randomly selected, find the probability that the sample mean will be between 150 and 157.
The four-wheel-steering automobile has several benefits. The system gives the driver a greater degree of control over the automobile. The driver gets a more forgiving vehicle over a wide variety of conditions.
Construct a box plot for the TIPRATE - What is the relationship between tips (TIP) and the total bill (TOTBILL) and what does the evidence indicate? Is there a tendency for customers to give "generous" or "cheap" tips relative to the total bill?
Do the test results tend to support the manager's suspicion that adverse conditions might be detrimental to the operating lifespan of halogen lightbulbs used in her plant?
Could you detail the value of using standard scores (Z scores) to compare relative performance of individual test scores.
tell me your top 5 ideas on how professors and teachers can use social media to enhance the learning process. list each
Items that fail during the test will be replaced. Assuming the time-to-failure distribution to be exponential, determine the plan using Handbook H-108.
Under what situations must the nonparametric test be used? Describe in detail. Write down the strengths and weaknesses of nonparametric tests?
a precision drill positioned over a target point will make an acceptable hole if it is within 5 microns of the target.
Modify the make-account procedure so that it creates password-protected accounts. That is, make-account should take a symbol as an additional argument, as in (define acc (make-account 100 'secret-password
How large a sample should she take to estimate the percentage with a margin of error of no more than 4%, with 90% confidence?
In a sample of 80 mail carriers 16 had been bitten. At the 0.05 level of confidence, is there a significant difference in the proportions?
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