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Question: Which inference method?
(a) How do young adults look back on adolescent romance? Investigators interviewed 40 couples in their midtwenties. The female and male partners were interviewed separately. Each was asked about his or her current relationship and also about a romantic relationship that lasted at least two months when they were aged 15 or 16. One response variable was a measure on a numerical scale of how much the attractiveness of the adolescent partner mattered. You want to find out how much men and women differ on this measure.
(b) Are more than 75% of Toyota owners generally satisfied with their vehicles? Let's design a study to find out. We'll select a random sample of 400 Toyota owners. Then we'll ask each individual in the sample: "Would you say that you are generally satisfied with your Toyota vehicle?"
(c) Are male college students more likely to binge drink than female college students? The Harvard School of Public Health surveys random samples of male and female undergraduates at four-year colleges and universities about whether they have engaged in binge drinking.
(d) A bank wants to know which of two incentive plans will most increase the use of its credit cards and by how much. It offers each incentive to a group of current credit card customers, determined at random, and compares the amount charged during the following six months.
At the 0.05 level of significance, can we reject the possibility that the interviewers are equally capable of obtaining interviews?
The superintendent of a printing plant has selected a random sample of 100 rolls of paper from a large shipment. The average length of the sample rolls is 416 feet, with a variance of 2704 feet.
an investor estimates that there is a 75 chance that a particular mutual funds price will increase to 100 per share
Use the definition of the mean and variance for discrete random variables to show that X does have mean μ and standard deviation σ.
a box contains ten tickets four marked with a positive number and six with a negative number. all the numbers are
Use the given degree of confidence and sample data to construct a confidence interval for the population mean x. Assume that the population has a normal distribution.
What is the p calculated (probability) for your sample results? Now that we have changed Lesley's X score to 4, if we change Linda's X score to -20 which statement is true?
Construct a misleading graph that a college recruiter might create to convince high school students that they should attend college. Construct a graph that does not mislead.
Suppose we deal five cards from an ordinary 52-card deck. What is the conditional probability that all five cards are spades, given that at least four
determine the critical region and critical values for z that would be used to test the null hypothesis at the given
If you were to accept the null hypothesis, even though the null hypothesis was false, what type of error would you have commited?
How many different participants do you need for a completely independent groups assignment, and a completely repeated measures assignment.
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