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Question: A market research field worker needs to interview married couples about use of a certain product. The researcher arrives at a residential building with three apartments. From the names on the mailboxes downstairs, the interviewer infers that a married couple lives in one apartment, two men live in another, and two women live in the third apartment. The researcher goes upstairs and finds that there are no names or numbers on the three doors, so that it is impossible to tell in which of the three apartments the married couple lives. The researcher chooses a door at random and knocks. A woman answers the door. Having seen a woman at the door, what now is the probability of having reached the married couple? Make the (possibly unrealistic) assumptions that if the two men's apartment was reached, a woman cannot answer the door; if the two women's apartment was reached, then only a woman can answer; and that if the married couple was reached, then the probability of a woman at the door is 12. Also assume a 13 prior probability of reaching the married couple. Are you surprised by the numerical answer you obtained?
Which of the following errors will be associated with the sample? Errors due to interviewer bias and selection bias.
The reliability procedure that involves correlation of partial scores from one administration of one test is test-retest
Richwood Products buys parts from Staple Brothers machining. The engineers at Richwood want to ensure that the parts purchased meet their company's standards.
Create a 95% confidence interval for the change in enrollment rates.- Based on your confidence interval, are you convinced that this new form of recruiting has been effective? Explain.
A medical doctor wishes to test the claim that the standard deviation of the systolic blood pressure of deep sea divers is less than 450. To do so, she selected a random sample of 20 divers and found s = 432.
The cost of an e-commerce website can vary a great deal. A market research team hypothesized that the cost of an average website is $3500.
One student in the class wondered whether the correlation coefficient was reliable; that is, would a nonzero correlation be found in other classes? How can reliability be determined without calculating an r on another class?
How do you calculate a participant score if she was at the 67th percentile? I only have the standard deviation of the population and the mean. s = 27 x = 448.95
in the manufacturer sector the types of items measured for example average call times product weights container volumes
the cost of parking is 9 per day. suppose that if you were to park illegally the probability of getting a ticket is
An individual is considered to be obese if his or her BMI is at least 30 (Kuczmarski et al., 1997). Consider the population of NHANES III data given in Table 15.2 (discussed in Example 15.4) and let p denote the proportion of individuals in this p..
Consider the following data obtained for two samples selected at random from two populations that are independent and normally distributed with equal variances.
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