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STAT 251 Part 2 Online Assignment




Question;Name___________________________________ Date__________________ 1. A food snack manufacturer samples 11 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 13.2 oz. and the sample standard deviation is 0.60 oz., find the 95% confidence interval of the true mean. Show all work.2. A random sample of magnesium concentrations (in parts per million, or ppm) in ground water from various locations follows. Estimate the mean concentration of magnesium in ppm with 90% confidence. Show all work. You may use your calculator to find the mean and standard deviation.45104161024858911061165790701238111740550593. A survey of 800 women shoppers found that 17% of them shop on impulse. What is the 98% confidence interval for the true proportion of women shoppers who shop on impulse?4. A manufacturer claims that its televisions have an average lifetime of at least five years (60 months) with a population standard deviation of seven months. Eighty-one televisions were selected at random, and the average lifetime was found to be 59 months. With? = 0.05, is the manufacturer's claim supported? Conduct five-step hypothesis testing.5. Science fiction novels average 310 pages in length. The average length of 14 randomly chosen novels written by I. M. Wordy was 375 pages in length with a standard deviation of 40. At =.05, are Wordy's novels significantly longer than the average science fiction novel?Conduct five-step hypothesis testing.6. Two allergists recorded the main area of allergy for new patients during a month. At, test the claim that the allergy diagnosis and the doctor that treated the patients are independent.AllergiesPollenFoodMoldPetsDoctor 18657Doctor 23466247. From the Data Bank in Appendix D, choose two variables that you think might be related, such as exercise and weight, or IQ and educational level.Performa complete correlation and regression analysis. Use Minitab or Excel to do the calculations and the graphs, but you must still conduct the hypothesis testing. a. Draw a scatterplotb. Compute the correlation coefficientc. Use hypothesis testing to determine if r is significant.d. Find the regression line if r is significant.e. Summarize the results, include your personal reaction to the results.8. Game: Roll two dice and record the sum. You must pay $1.00 to play the game. The payout is as follows:A sum of 2 or 12 $3.00A sum of 3 or 11 $2.00A sum of 4 or 10 $1.00Any other sum $0.00 Play the game 25 times and use the table to record your results. TurnSumWinPayReturn12345678910111213141516171819202122232425Calculate the average outcome by totally up your returns and dividing by 25. Report your results in Canvas so we can compare. After you complete the experiment, then calculate the expected value by using the formula from the book. Would you expect your results to be exactly the same as the theoretical average? Compare the theoretical results to the empirical results. What will happen when we combine the results from the entire class? Will it be closer to the theoretical average?


Paper#61720 | Written in 18-Jul-2015

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