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The chancellor at City University is worried that the grades have fallen in the past year. The grade point average for graduating students in the previous 5 years was 2.80 with a standard deviation of 0.25.The chancellor randomly samples 10 seniors from this year's graduating class and obtains the following GPAs: 2.40, 2.80, 2.65, 2.15, 2.65, 2.72, 2.42, 2.70, 2.52, 2.49. What can the chancellor conclude? Use a two-tailed test at the .05 significance level.
Compute the expected rework cost for each problem separately. For example, the expected rework cost for "broken case" is 0.046.88.
A political strategists believes that less than 55% of voters in a certain state support a particular issue. He then commission s a poll of 500 voters and 54% of them support this issue. If a = .05, is the political strategist's belief warranted
The summary statistics were n = 32, x‾ = 22.4. Is there any evidence to suggest the fertilizer improves the thickness of an average lawn? Assume σ = 2.7 and use a = 0.005.
The average for 14 cross-country runners is 172 mg/dl with a standard deviation of 41 mg/dl. Solve using the Traditional Method. Find the p-value for your test statistic. Use an α = 0.05.
What was the capital gain of the TIPS in dollars? What was the capital gain of the TIPS in percentage?
Use this example to discuss the importance of making the distinction between the common use and the statistical use of the word significant.
A psychologist has designed a questionnaire to measure individuals' aggressiveness. Suppose that the scores on the questionnaire are normally distributed.
1. nbspif the mean number of hours of television watched by teenagers per week is 12 with a standard deviation of 2
A tollbooth operator has observed that cars arrive randomly at and average randomly at an average rate of 360 cars per hour. (Hint use a Poisson Distribution).
purpose students will conduct one brief research exercise that will be written up as a research report using apa
The mean number of cups was 5 with a standard deviation of 1.5 cups. The distribution was normal. What proportion of students drank 7 or more cups of coffee per day?
What percentage of all samples of size 61 will have a mean value between 454 and 482? Give your answer correct to one decimal place.
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