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A study by Careerbuilder.com found that 20% of companies check out job candidates' profiles on social networking sites like Facebook and MySpace before deciding whether to employ them. Assuming that the survey included a simple random sample of 1200 companies, construct a 90% confidence interval for π = the population proportion of companies that check social-networking sites before offering employment.
Construct a 90% confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of plus or minus .03 grams with a 90% confidence?
Using decision tree analysis, decide whether Jay must proceed with his law suit against manufacturer.
Draw a picture of the density function of X, and use it to illustrate the probabilities that you found in parts (c) and (d).- What is the expected value of X? This was not covered in the text, so explain your reasoning.
In an early study, researchers at an Ivy University found that 33% of the freshmen had received at least one A in their first semester.
to examine the effectiveness of its four annual advertising promotions a mail order company has sent a questionnaire to
Freshman 15? Many people believe that students gain weight as freshmen. Suppose we plan to conduct a study to see if this is true.
What is the probability of getting two hearts assuming the first one is not replaced?
An automobile rental agency has the following mileages (in thousands) for a simple random sample of 20 cars rented last year. Given this information, and assuming the data are from a population that is approximately normally distributed, constr..
Verify that the "Conditions for Probabilities for Discrete Random Variables" given on page 267 are met.- Draw a picture of the probability distribution function.
In a random sample of 16 mountain climbers who are going to attempt Mt. McKinley what is the probability of each of the following All 16 reach the summit.
Do the data provide evidence that the alcohol signifiant increased (slowed) reaction time?use a one tailed test with o= .05 The date ____provide evidence that alcohol significant increased (slowed) reaction times as the value of the z-score is ____..
question 1.the average annual salary for all u.s. teachers is 29863. assume that the distribution is normal and the
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