webassign.net 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 72 students in the highest quartile of the distribution, the mean score was x = 178.10. Assume a population standard deviation of = 7.71. These students were all classified as high on their need for closure. Assume that the 72 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 on the "need for closure scale" for all students with a high need for closure. (Round your answers to two decimal places.) lower limit upper limit 4. [-/1 Points] DETAILS BBUNDERSTAT12HS 7.R.010.S. MY NOTES ASK YOUR TEACHER A research group conducted an extensive survey of 3103 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?" 1486 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. How large a sample is needed if we wish to be 95% confident that the sample percentage of those equating success with personal satisfaction is within 1.1% of the population percentage? (Hint: Use p = 0.48 as a preliminary estimate. Round your answer up to the nearest whole number.) USE SALT workers 5. [-/3 Points] DETAILS BBUNDERSTAT12HS 7.1.022.MI. MY NOTES ASK YOUR TEACHER At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. Wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. The cyclic nature of wind and moving sand determines the shape and location of large dunes. At a test site, the prevailing direction of the wind did not change noticeably. However, the velocity did change. Sixty-five wind speed readings gave an average velocity of x = 1075 cm/sec. Based on long-term experience, o can be assumed to be 230 cm/sec. (a) Find a 95% confidence interval for the population mean wind speed at this site. (Round your answers to the nearest whole number.) lower limit upper limit cm/sec cm/sec (b) Does the confidence interval indicate that the population mean wind speed is such that the sand is always moving at this site? Explain. No. This interval indicates that the population mean wind speed is such that the sand may not always be moving at this site. Yes. This interval indicates that the population mean wind speed is such that the sand may not always be moving at this site. Yes. This interval indicates that the population mean wind speed is such that the sand is always moving at this site. No. This interval indicates that the population mean wind speed is such that the sand is always moving at this site.