Question

A) A research group conducted an extensive survey of 2933 wage and salaried workers on issues ranging from relationships with their bosses to household chores. The data were gathered through hour-long telephone interviews with a nationally representative sample. In response to the question, "What does success mean to you?" 1500 responded, "Personal satisfaction from doing a good job." Let p be the population proportion of all wage and salaried workers who would respond the same way to the stated question. Find a 90% confidence interval for p. (Round your answers to three decimal places.)

What are the upper and lower limits?

B) The personnel office at a large electronics firm regularly schedules job interviews and maintains records of the interviews. From the past records, they have found that the length of a first interview is normally distributed, with mean μ = 36 minutes and standard deviation σ = 9 minutes. (Round your answers to four decimal places.)

Seven first interviews are usually scheduled per day. What is the probability that the average length of time for the seven interviews will be 40 minutes or longer?

C) Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 68 students in the highest quartile of the distribution, the mean score was x = 177.90. Assume a population standard deviation of σ = 8.23. These students were all classified as high on their need for closure. Assume that the 68 students represent a random sample of all students who are classified as high on their need for closure. Find a 95% confidence interval for the population mean score μ on the "need for closure scale" for all students with a high need for closure. (Round your answers to two decimal places.)

What are the upper and lower limits?

Answer 1

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