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A local college requires an English composition course for all freshman. This year they are evaluating a new online version of the course. A random sample of n=16 freshman is selected and the students are placed in the online course. At the end of the semester, all freshman take the same English composition exam. The average score for the same is M=76. For the general population of freshman who took the traditional lecture class, the exam scores form a normal distribution with a mean of µ=80.
If the final exam scores for the population have a standard deviation of 12, does the sample provide enough evidence to conclude that the new online course is significantly different from the traditional class? Assume a two-tailed test with and alpha =.05.
If the population standard deviation is 6, is the sample sufficient to demonstrate a significant difference? Again, assume a two-tailed test with and alpha =.05.
Comparing your answers for parts a and b, explain how the magnitude of the standard deviation influences the outcome of a hypothesis test.
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? Compute the value of the test statistic.
You are asked by the owner of the Starshine Motel to develop a customer satisfaction survey to determine the percentage of customers who are dissatisfied with service.
Is there reason to believe there is a positive linear correlation between the number of t.v. commercials and the sale of this product?
Find out whether or not right-hemisphere damage results in significantly reduced performance on spatial skills task. Test with alpha set at .05 with one tail.
Define irregular component in time series and explain the differences between other components as well as its effects.
Analyze whether or not patients undergoing this treatment are illustrating significant change from baseline to 3 months afterward. Report a p-value.
You can allow the cup to overfill 4% of the time. What amount should you set as the mean amount of coffee to be dispensed?
The mean monthly demand for steam boilers is 6.8 with a standard deviation of 1.7. Compare the dispersion of these distributions. Which demand pattern has more relative variation? Explain.
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?
Hypothesis Testing: We wish to test the claim that the mean body mass index (BMI) of men is equal to the mean BMI of women. Use the data to the right to test this claim.
The probability that student pilot passes the written test for a private pilot's license is 0.7. Find the probability that the student will pass the test: (a) on the third attempt (b) before the fourth attempt.
Based on these results, does te diet appear to be effective? Does the diet appear to have practical significance?
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