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Media survey
In 2007, a Gallup Poll conducted face- to-face interviews with 1006 adults in Saudi Arabia, aged 15 and older, asking them questions about how they get in- formation. Among them was the question: "Is international television very important in keeping you well-informed about events in your country?" Gallup reported that 82% answered "yes" and noted that at 95% confidence there was a 3% margin of error and that "in addition to sampling error, question wording and practical difficulties in con- ducting surveys can introduce error or bias into the find- ings of public opinion polls."
a) What kinds of bias might they be referring to?
b) Do you agree with their margin of error? Explain.
You are asked to test the CFO's claim by examining monthly profits from the sample mega stores using the Z-test. State the decision rule using α = 0.05 significance level?
a study is conducted to compare mean cholesterol levels for individuals following a low carbohydrate diet for at least
The events A and B are mutually exclusive. Suppose P(A) = .30 and P(B) = .20. What is the probability of either A or B occurring? What is the probability that neither A nor B will happen?
poor milhouse is hopelessly in love with lisa. unfortunately for milhouse lisa does not feel the same way. however
BMI in children is approximately normally distributed with a mean of 24.5 and a standard deviation of 6.2. A BMI between 25 and 30 is considered overweight. What proportions of children are overweight?
in a poll 1003 adults in a country were asked whether they favor or oppose the use of federal tax dollars to fund
The weight of 500 american men were taken and the sample mean was found to be 194 pounds with a standard deviation of 11.2 pounds. what percentage of men have weights between 175 and 225 pounds
what is the critical f value for a sample of 7 observations in the numerator and 6 in the denominator? use a two-tailed
an airplane holds 20 passengers. the probability a passenger will not show up is .1a. if the airline sells 25 tickets
A statistics instructor wants to know which route will get her to school the fastest. Each day from October 2 to November 15, when she gets to the turn point she checks the odometer on her car
historically, only 5% of the gear boxes have such flaws. what is the probability that hooper's sample contains no gear boxes with manufacturing flaws ?
You are tracking the sales of three tires. Using the binomial distribution formula, what is the probability that at least one will need a repair?
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