Question

In: Statistics and Probability

a previous study of a large cross-section of students in this course showed that students studies...

a previous study of a large cross-section of students in this course showed that students studies 12 hours per week. Are the results of this current study statistically different than the assumption of 12 hours per week studying? Define the hypotheses and compare the t-value to the critical t value, evaluating at α = 0.05.

Previous Study:

A sample of students from an introductory business course were polled regarding the number of hours they spent studying for the last exam. All students anonymously submitted the number of hours on a 3 by 5 card. There were 24 individuals in the one section of the course polled. The data was used to make inferences regarding the other students taking the course. The data are shown below:4.522 7 14.59 9 3.58 11 7.518 20 7.59 10.515 19 2.55 9 8.514 20 8

a,Based on the sample results, find the 95% confidence interval.

b. Interpret the results.

c. Do you expect a 90% confidence

e interval to be wider or narrower and why?

Solutions

Expert Solution


Related Solutions

Students believe that if everyone in the course studies for the final exam, then the average...
Students believe that if everyone in the course studies for the final exam, then the average mark everyone can expect is 75. However, if no one studies, everyone does so poorly that grades are scaled and the average mark of 60 is achieved. If one person studies while everyone else doesn’t, the one who studies achieves 80, the rest achieve 45 (and no scaling takes place). This game is a one-off simultaneous game with the two players to be ‘You’...
A study of North York University students showed the mean age of all students in the...
A study of North York University students showed the mean age of all students in the first year of university to be 19.6 years old with a standard deviation of 1.06 years. A randomly selected subgroup of these first-year students also averaged 19.4 years in age with a standard deviation 1.05 years. a) Are the numbers 19.6 and 1.06 statistics or parameters? Explain. The numbers are parameters because they were calculated for all North York University's first-year students. The numbers...
A study of 35 golfers showed that their average score on a particular course was 92....
A study of 35 golfers showed that their average score on a particular course was 92. The standard deviation of the population is 5. a. Find the best point estimate of the mean b. What is the margin of Error? c. Find the 95% confidence interval of the mean score for all golfers. d. Find the minimum number of golfers for 99 percent confidence when the score when the margin of error is 3.
A study of 35 golfers showed that their average score on a particular course was 92....
A study of 35 golfers showed that their average score on a particular course was 92. The standard deviation of the sample is 5. a. Find the best point estimate of the mean. b. Find the 95% confidence interval of the mean score for all golfers. c. Find the 99% confidence interval of the mean score for all golfers.
Suppose that in a large population of students, the mean amount of sleep the previous night...
Suppose that in a large population of students, the mean amount of sleep the previous night was μ = 7.15 hours and the standard deviation was σ = 1.5 hours. Consider randomly selected samples of n = 240 students. (a) What is the value of the mean of the sampling distribution of possible sample means? Mean =   (b) Calculate the standard deviation, s.d., of the sampling distribution of possible sample means. (Round your answer to three decimal places.) s.d.(x) =...
A large cross-section of CFO’s in the US believes they are now able to make day-to-day...
A large cross-section of CFO’s in the US believes they are now able to make day-to-day financial decisions faster because they have more reliable operational data because of the improved processes and controls. SOX is increasingly being deployed as part of a broader risk management approach that can, at least theoretically, deliver a significant return on investment (ROI). SOX can be tackled as part of a larger risk management strategy, which can generate value that would be ignored if an...
A direct shear test is conducted on a large specimen of dry sand (square cross section...
A direct shear test is conducted on a large specimen of dry sand (square cross section with following dimensions: 7.5 cm x 7.5 cm x 3.0 cm [height], Mass = 271.0 g) with a normal stress of 500 kPa. Failure occurred when the horizontal force was 1.96 kN. For the same sand, tests were also conducted to determine the specific gravity and the maximum and minimum void ratios. These tests yielded the following results: Gs= 2.65, emax=0.80, emin = 0.45....
Derive the expression for the scattering cross-section & extinction cross-section for a metal nanosphere (a/lambda <...
Derive the expression for the scattering cross-section & extinction cross-section for a metal nanosphere (a/lambda < 0.1)? This problem comes from the topic of Localized Surface Plasmons
explain how the study of a course in communication benefits students at the university as they...
explain how the study of a course in communication benefits students at the university as they prepare for their professional lives
A sample of 10 students was selected from a large statistics course. The grades of the...
A sample of 10 students was selected from a large statistics course. The grades of the 10 students on their test are shown below: 94 61 96 66 92 68 75 85 84 78 3a. Create a histogram, with the first class being 60-69. (3 pts) 3b. Calculate the following for the above data. Please only report the results. (8 pts) Mean = _____ Median = _____ Mode = _____ Range = ____ 3c. Calculate the standard deviation for the...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT