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1. A telephone sales solicitor, trying to decide between two alternative sales pitches, randomly alternated between them during a day of calls. Using approach A, 20% of 100 calls led to requests for the mailing of additional product information. For approach B in another 100 calls, only 14% led to requests for the product information mailing. At the 0.05 level, can we conclude that the difference in results was due to chance? Determine and interpret the p-value for this test, then construct and interpret the 95% confidence interval for 7T1 2 7T2.
2. In a preliminary study, the U.S. Veterans Affairs Department found that 30.9% of the 81 soldiers who were near an accidental nerve gas release just after the 1991 Persian Gulf War had muscle and bone ailments, compared to a rate of 23.5% for the 52,000 Gulf veterans who were not near that area. Use an appropriate one-tail test and the 0.10 level of significance in examining the difference between these two rates. Determine and interpret the p-value for the test. Source: John Diamond, "Some Veterans Suffer Bone, Muscle Ailments," The Indiana Gazette, January 22, 1997, p. 5.
worldwide it is understood that iq scores follow a normal distribution. it is assumed that the middle 95 of the
If statistically significant, do you believe the difference is large enough to be significant? If so, to whom, and explain why? Is normality assumption fulfilled? Describe.
A statistics practitioner conducted a two-factor analysis of variance experiment with a =4, b = 3, and r = 8. The sum of squares are listed here:
Which of the following does not explain a possible relationship between variables when the null hypothesis is rejected
assume that the client will allocate 10000 to the eight recommended stocks in increments of 1000 with all allocations
Suppose local monthly cell phone bills are normally distributed with a standard deviation $12. What is the probability that a randomly selected cell phone bill is between $30 and $55?
Small Wonder, an amusement park, experiences seasoned attendance. It has collected two years of quarterly attendance data and made a forecast of annual attendance for the upcoming year.
You are an Internal Revenue Service (IRS) agent who is performing an audit to determine if a foreign taxpayer is avoiding tax on earned income that is subject to U.S. tax. Suggest how you will approach the audit to ensure that the foreign taxpayer..
How many nickels does a coin counter manufacturer need to weigh so that she can be 98% confident that her sample mean is within 25 milligrams.
1. What are degrees of freedom? How are the calculated? 2. What do inferential statistics allow you to infer?
College Students' Seating Choices and Motivation to Achieve.This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
suppose a machines life time in years can be moldeled with an exponential distribution with rate of lambda 14.a.
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