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A confidence interval was used to estimate the proportion of statistics students that are female. A random sample of 72 statistics students generated the following 90% confidence interval: (0.438, 0
The Water and Juices store stated that the average consumption of water per day was 123 gallons. To test the hypothesis that this figure may no longer be true, a researcher randomly selected 150 pe
Are the prices of these computer stores significantly different? Test at α =.025 significance level.
The Chocolate Chip Cookies store claims that the average 1-ounce chocolate chip cookie contains less than 100 calories. A random sample of 16 different brands of 1-ounce chocolate chip cookies resul
Which of the following is not a component of all mathematical models?
The makers of a soft drink want to identify the average age of its consumers. A sample of 16 consumers is taken.
One of the stores is a proud sponsor of the college soccer team. They constantly try to raise money for the team and they want to determine if there is any type of relationship between the amount of
Suppose an Insurance company reports that approximately 85% of all automobile damage liability claims were made by people less than 25 years of age. A random sample of six automobile insurance liab
A confidence interval of 90% was used to estimate the proportion of customers who buy at least two items during their shopping mall experience. A random sample of 200 customers produced the followi
You are the shipping manager at the Postham Company. You are interested in the percentage of packages delivered damaged. A simple random sample of 500 packages yields 16 delivered damaged and 484 d
The mall carousel has a set of data with rider's age (X) and the corresponding number of on-the-ride-accidents. Analysis on the set finds that the regression equation is Y=175-4.9X. a. What can be s
A Rollercoaster's auditors estimate that the average daily loss from those illegally riding without tickets is never more than $200, but wants to determine the accuracy of this statistic. The compan
To investigate, 400 people were observed entering the building. The number using each entrance is reported below. At the .01 significance level, is there a difference in the use of the four entrance
A random sample of 150 viewers last night revealed 53 watched the news on WNAE (channel 5), 64 watched on WRRN (channel 11), and 33 on WSPD (channel 13). At the .05 significance level, is there a di
A sample of 18 homes, also sold within the last year, that were one to three blocks from the ocean revealed that the standard deviation was $21,330. At the .01 significance level, can we conclude th
For a study of 45 hardware issues, the mean time for the technician to resolve the problem was 15.5 minutes with a standard deviation of 3.9 minutes. This information was also obtained from monitore
A large bank believes that one-third of its checking customers have used at least one of the bank's other services during the past year. How large a sample is required to estimate the actual propor
Test the claim that the mean age of people in the United States who would say yes to the survey question shown above is 60 years or older. Use α = 0.10 and assume that the population is norma
A sample of 23 European countries found that the variance on life expectancy was 7.3 years. What is the 95% confidence interval for the variance of life expectancy in Europe?
A researcher wishes to test the claim that the average cost of tuition and fees at a 4-year college is greater than $5700. She selects a random sample of 16 colleges and finds the mean to be $5950.
No claim was made by the school. They took a sample with the above results and want to construct a two-sided 95% confidence interval for the population mean. The upper limit of the confidence interv
A poll is planned to determine what portion of all students favor an increase in fees to support a new track and field stadium. aquestionnaire will be published and the first 1000 completed questio
If we wish to be 95% certain of avoiding a Type I error, use these data to examine differences in the average distance traveled to the two clinics.
Dollar Department Stores has received an offer from Harris Diamonds to purchase Dollars store on Grove Street for $120,000. Dollar is an expected-value maximizer.
A sample of 1,108 was used to estimate a proportion with 98% confidence. If p = 0.12 , what was the amount of error?