background is related to teaching efficiency. In a certain college, 95 faculty members were taken and the results are shown below. Effective Efficiency Very Effective Not Effective Educational Background Bachelor's Degree 10 23 7 Master's Degree 16 10 8 Ph. D. 10 6 5 Based on the above data, can we say that the teaching efficiency is related to educational background?
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- A report by the Gallup Poll stated that on average a woman visits her physician 5.8 times a year. A researcher randomly selects 20 women and obtained onto the data below.The technology underlying hip replacements has changed as these operations havebecome more popular (over 250,000 in the United States in 2008). Starting in 2003,highly durable ceramic hips were marketed. Unfortunately, for too many patients theincreased durability has been counterbalanced by an increased incidence ofsqueaking. The May 11, 2008, issue of the New York Times reported that in one studyof 143 individuals who received ceramic hips between 2003 and 2005, 10 of the hipsdeveloped squeaking.a. Calculate a lower confidence bound at the 95% confidence level for the trueproportion of such hips that develop squeaking.b. Interpret the 95% confidence level used in (a).A study of college football games shows that the number of holding penalties assed has a mean of 2.2 penalties
- The ecology club at a local high school took separate random samples of sophomores, juniors, and seniors to learn whether there are differences in attitudes toward recycling by grade level. Students were asked to respond yes or no to the question, “Do you regularly recycle plastic bottles?” The results were summarized in a 3-by-2 table of counts organized by grade level and yes/no response to the recycling question. The club performed a chi-square test for homogeneity across the three grade levels. Which of the following could be an appropriate null hypothesis used by the club? H0:H0: p1=p2=p3p1=p2=p3, where p1p1 is the proportion of the sample of sophomores that responded yes, p2p2 is the proportion of the sample of juniors that responded yes, and p3p3 is the proportion of the sample of seniors that responded yes. H0:H0: There is an association between grade level and whether or not a student regularly recycles plastic bottles. H0:H0: There is no difference in the distribution of…A study was conducted to determine if gender was associated with undergraduate major. The investigators sampled 255 college seniors at their graduation. Is there an association between gender and undergraduate major at a 5% level of significance?A doctor is concerned that nausea may be a side effect of Tamiflu, but is not certain because nausea is common for people who have the flu. She researched some past studies, and found that about 38% of people who get the flu and do not use Tamilflu experience nausea. She then collected data on 2997 patients who were taking Tamiflu, and found that 1067 experienced nausea. Use a 0.05 significance level to test the claim that the percentage of people who take Tamiflu for the relief of flu symtoms and experience nausea is 38%. What type of test will be used in this problem? What evidence justifies the use of this test? Check all that apply The sample size is larger than 30 The sample standard deviation is not known There are two different samples being compared The original population is approximately normal The population standard deviation is known np>5 and nq>5 The population standard deviation is not known Enter the null hypothesis for this test.H0 Enter the…
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- According to the February 2008 Federal Trade Commission report on consumerfraud and identity theft, 23% of all complaints in 2007 were for identity theft. Inthat year, Arkansas had 1,601 complaints of identity theft out of 3,482 consumercomplaints ("Consumer fraud and," 2008). Does this data provide enoughevidence to show that Arkansas had a higher proportion of identity theft than23%? Test at the 5% level.An industrial psychologist conducted an experiment in which 40 employees that were identified as “chronically tardy” by their managers were divided into two groups of size 20. Group 1 participated in the new “It’s Great to be Awake!” program, while Group 2 had their pay docked. The following data represent the number of minutes that employees in Group 1 were late for work after participating in the program. 114, 122, 137, 141, 137, 153, 138, 173, 128, 131, 143, 119, 128, 143, 148, 149, 149, 150, 121, 143 Determine whether the sample data could have come from a population that is normally distributed. Explain how you know.A doctor is concerned that nausea may be a side effect of Tamiflu, but is not certain because nausea is common for people who have the flu. She researched some past studies, and found that about 25% of people who get the flu and do not use Tamilflu experience nausea. She then collected data on 2492 patients who were taking Tamiflu, and found that 589 experienced nausea. Use a 0.01 significance level to test the claim that the percentage of people who take Tamiflu for the relief of flu symtoms and experience nausea is 25%. What is the p-value for this test?